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Productivity of Eucalyptus regnans Forest Regenerating after Bushfire
Item type: Journal Article • Journal: South African Forestry Journal • Authors: Peter Attiwill --- , AustraliaA natural forest of mountain ash was clearfelled in 1983 and burned by bushfire immediately after logging. The resulting natural regeneration has high productivity, with a mean volume increment close to 50 m3/ha per year, mean rate of biomass accumulation... -
The Impact of Weeds and Two Legume Crops on Eucalyptus Hybrid Clone Establishment
Item type: Journal Article • Journal: South African Forestry Journal • Authors: A.W. Schumann --- ,The relative competition imposed on Eucalyptus hybrid clone GC304 grown from establishment with either complete weed cover, intra-row weeds, inter-row weeds or legume cover crops of Mucuna pruriens and Vigna sinensis is under study in a field experiment on a... -
Evaluation of the grazing potential of grass species in Tarchonanthus veld of the northern cape1
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: J.H. Fourie --- Department of Agriculture (Free State Region), D.P.J. Opperman --- Department of Pasture Science, B.R. Roberts --- Department of Pasture Science,The grazing value of the seven most prominent grass species in Tarchonanthus‐limeveld was investigated from 1977 to 1981. -
The influence of different land‐use practices on soil erosion, herbage production and on grass species richness and diversity
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: J. Venter --- Natal Parks Board, Republic of South Africa B. Liggitt --- Institute of Natural Resources, Republic of South Africa N.M. Tainton --- Department of Grassland Science, Republic of South Africa G.P.Y. Clarke --- Department of Statistics, Republic of South AfricaA fence‐line contrast study compared erosion levels, herbage production and grass species diversity in Umfolozi Game Reserve (UGR) and adjacent KwaZulu (KWZ). There was no significant difference in soil loss or A‐horizon depths measured in KWZ and UGR, but there... -
A comparison of four different standards of reference for the animal unit for Determining stocking rate
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: J.R. Turner --- Department of Grassland Science, Republic of South Africa N.M. Tainton --- Department of Grassland Science, Republic of South AfricaNo single standard of reference for the animal unit (AU) for determining stocking rates has materialized. Often, therefore, it is not clear which standard of reference for the AU or which method of determining stocking rate has been used in... -
Seasonal changes in above‐ground standing crop in three coastal grassland communities in Transkei1
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: C.M. Shackleton --- Department of Botany, TranskeiAbove‐ground standing crop (ASC) dynamics were followed over a two‐year period in three coastal grassland communities. The mass of biomass, necromass and litter components was determined monthly from hand‐clipped samples and compared under three management treatments — grazing, burning and... -
Defoliation effects on resource allocation in Arizona cottontop (Digitaria californica) and Lehmann lovegrass (Eragrostis lehmanniana)
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: JerryR. Cox --- , Republic of South Africa M. Giner‐Mendoza --- , Mexico A.K. Dobrenz --- Plant Sciences Department, United States of America MarieF. Smith --- , Republic of South AfricaArizona cottontop (Digitaria californica), a bunchgrass native to the Chihuahuan and Sonoran Deserts in North America, and Lehmann lovegrass (Eragrostis lehmanniana), a bunchgrass introduced to the southwestern USA from southern Africa, were defoliated and examined for above‐ and below‐ground productivity,... -
Implikasies van die oesindeks by navorsing verbouing van mielies
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: P.S. Hammes --- Departement Plantproduksie, R.E. Steynberg --- Departement Plantproduksie, E.A. Beyers --- Departement Plantproduksie, B. Kriel --- Departement Plantproduksie,Die oesindeks van mielies is bepaal in vier veldproewe. Verskille tussen mieliekultivars het voorgekom. Kultivars wat hoë graanopbrengste gelewer het in 'n kultivarproef, het ook deurgaans hoë oesindekswaardes gehad. In 'n langtermyn- bemestingsproef het behandelings wat kalium ontvang het, hoër... -
Maize response to plant population and soil water supply: I. Yield of grain and total above-ground biomass
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: W. van Averbeke --- Department of Agronomy, J.N. Marais --- Department of Agronomy,The effect of the level of water deficit on the yield of grain and total above-ground biomass of maize planted at greatly differing densities was investigated in a strictly controlled field experiment, repeated for four seasons. Differences in water supply... -
Die invloed van grondbewerking op vroeë wortelontwikkeling en biomassa van koringkultivars (Triticum aestivum L.)
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J.T. Steyn --- , Republiek van Suid-Afrika J. P.C. Tolmay --- , Republiek van Suid-Afrika J.J. Human --- Departement Agronomie, Republiek van Suid-AfrikaDit is bekend dat 'n goeie wortellengte en/of worteldigtheid in die eerste paar weke belangrik is om goeie saailingvestiging te verkry. Die doel van hierdie studie was om die uitwerking van minimumbewerking (wisselgangskotteleg en vlerkskaar), beitelploeg- en konvensionele bewerking op... -
Tolerance of six Namaqualand pioneer species to saline soil conditions
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A.J. de Villiers --- Department of Botany (Soil Science), Republic of South Africa M.W. van Rooyen --- Department of Botany (Soil Science), Republic of South Africa G.K. Theron --- Department of Botany (Soil Science), Republic of South Africa A.S. Claassens --- Department of Botany (Soil Science), Republic of South AfricaSaline soils pose a great problem to reclamation of mined areas in arid regions. Experiments were carried out in order to determine the tolerance of six Namaqualand pioneer species to varying levels of salinity. Both perennial and ephemeral species were... -
Influence of residual manure on selected nutrient elements and microbial composition of soil under long-term crop rotation
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A. Belay --- Department of Plant Production and Soil Science, Republic of South Africa A.S. Claassens --- Department of Plant Production and Soil Science, Republic of South Africa F.C. Wehner --- Department of Microbiology and Plant Pathology, Republic of South Africa J.M. de Beer --- Department of Plant Production and Soil Science, Republic of South AfricaA study was conducted on a long-term field experiment at the University of Pretoria, South Africa, that was established in 1939. The aim was to investigate the effects of residual manure on the characteristics of the total and microbial biomass... -
Soil nutrient contents, microbial properties and maize yield under long-term legume-based crop rotation and fertilization: a comparison of residual effect of manure and NPK fertilizers
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A. Belay --- Department of Plant Production and Soil Sciences, A.S. Claassens --- Department of Plant Production and Soil Sciences, F.C. Wehner --- Department of Microbiology and Plant Pathology, South AfricaA study was conducted in a field experiment that has been ongoing for over 60 years at the University of Pretoria, South Africa. The aim was to compare the residual effects of manure and NPK fertilizers on selected soil nutrients,... -
Initial growth potential and biomass production of field established guayule (Parthenium argentatum Gray.) cultivars
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: C.R. Bekaardt --- , South Africa P.J. Pieterse --- Department of Agronomy, South Africa E.M. Reinten --- , South Africa G.A. Agenbag --- Department of Agronomy, South AfricaThe initial growth potential and biomass production of four guayule cultivars under dryland conditions were investigated at different localities in South Africa. Growth (plant survival, height, canopy diameter, stem diameter) and biomass (wet and dry mass) were recorded for (1)... -
Depletion of nutrients in adjacent crop lands by Eucalyptus camaldulensis
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Jiregna Gindaba --- Department of Horticultural Science, South Africa Andrey Rozanov --- Department of Soil Science, South Africa Legesse Negash --- Department of Biology, EthiopiaFine root distribution of Eucalyptus camaldulensis Dehnh and effects on soil fertility attributes were studied under field conditions in Badessa, Eastern Ethiopia. Soil samples were collected from inside the stand, edge of the stand and 10 m away from the... -
Comparison of maize genotypes for grain yield, nitrogen uptake and use efficiency in Western Ethiopia
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: D. Tolessa --- Department of Soil, Crop and Climate Sciences, South Africa C.C. Du Preez --- Department of Soil, Crop and Climate Sciences, South Africa G.M. Ceronio --- Department of Soil, Crop and Climate Sciences, South AfricaNitrogen is the most limiting nutrient in the production of maize in western Ethiopia with its favourable climate for this crop. This is because Nitisols inherently low in N are used for maize production by resource-poor farmers who cannot afford... -
Nitrogen fixation and biomass productivity of indigenous legumes for fertility restoration of abandoned soils in smallholder farming systems
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: H. Nezomba --- , Zimbabwe T. P Tauro --- , Zimbabwe F. Mtambanengwe --- , Zimbabwe P. Mapfumo --- , ZimbabweMost legume-based soil fertility technologies often fail to make the desired impact on nutrient-depleted soils partly due to low N2-fixation rates and poor biomass productivity. A study was conducted in the 2004/05 and 2005/06 rainfall seasons to evaluate biomass productivity... -
Soil properties changes after short-term livestock exclusion in “degraded” communally managed rangelands in the western Bophirima District, South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A.S. Moussa --- , South Africa L. Van Rensburg --- , South Africa K. Kellner --- , South AfricaLivestock grazing and detrimental overgrazing are commonly associated with severe rangeland degradation particularly in communally managed pastoral systems in South Africa. Effects of grazing exclusion on vegetation are well documented, but there is a dearth of quantitative research conducted in... -
Are ‘ancient wheat species’ more adapted to hostile environments than modern bread wheat?
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: D.L. Sparkes --- , UKThis preliminary study investigated whether three ‘ancient wheat species’, spelt (Triticum spelta L.), emmer (Triticum dicoccum) and einkorn (Triticum monococcum L.) are more adapted to hostile environments than modern bread wheat (Triticum aestivum L.) based on their physiological characteristics and... -
Open-top chamber facility to study air pollution impacts in South Africa. Part II: SO2–drought interactions on yield, photosynthesis and symbiotic nitrogen fixation in soybean
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: E Heyneke --- School of Environmental Science and Development, South Africa AJ Strauss --- School of Environmental Science and Development, South Africa RJ Strasser --- Bioenergetics Laboratory, Switzerland GHJ Krüger --- School of Environmental Science and Development, South AfricaSouth Africa has an extremely energy-intensive economy, resulting in substantial air pollution through its coal-fired power stations. Modelled sulphur dioxide (SO2) concentrations on the central Highveld mostly range between 10 and 50 ppb, exceeding 50 ppb in source areas. Well-watered... -
Carbon stocks in fynbos, pastures and vineyards on the Agulhas Plain, South Africa: a preliminary assessment
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: AJ Mills --- Department of Soil Science, South Africa SC Birch --- , South Africa JD Stephenson --- , South Africa RV Bailey --- , South AfricaLarge tracts of fynbos on the Agulhas Plain are being converted to agriculture. Carbon (C) stocks in fynbos, pastures and vineyards were measured in this preliminary study to determine whether conservation of fynbos results in greater C storage relative to... -
Effect of pH on growth, mineral content and essential oil quality of buchu (Agathosma betulina) grown under controlled conditions
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Babalwa Ntwana --- Department of Agronomy, South Africa G André Agenbag --- Department of Agronomy, South Africa Petrus Langenhoven --- , South AfricaBuchu (Agathosma betulina) is a traditional medicinal plant in the Western Cape province of South Africa and the essential oil derived from the leaves is exported in large volumes. The essential oil is not only used for medicinal purposes, but... -
A decade of exploitation and management of the Namibian hake stocks
Item type: Journal Article • Journal: South African Journal of Marine Science • Authors: A. van der WesthuizenThe hake resource is the most important commercial fish species in the demersal sector of Namibia's fisheries, both in terms of annual catch and contribution to Gross Domestic Product (GDP). The fishery now spans four decades. In the 1960s and... -
THE DETERMINATION OF CHLOROPHYLL
a IN WATER CONTAINING SEDIMENTItem type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: D.C. Grobler --- Department of Water Affairs, South Africa Elizabeth Davies --- Department of Water Affairs, South AfricaThe presence of sediment at concentrations of 0,2% by mass in water samples significantly lowered the amount of chlorophyll a that could be measured. Two types of sediment differed in their ability to lower the chlorophyll a concentration. The chemically... -
AQUATIC MACROPHYTE COMMUNITIES OF THE WILDERNESS LAKES: COMMUNITY STRUCTURE AND ASSOCIATED ENVIRONMENTAL CONDITIONS
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: Clive Howard-Williams --- , South AfricaThe structure and summer biomass (g m−2 dry mass) of the principal aquatic macrophyte communities of the Wilderness Lakes were measured. Both emergent and submerged communities were included in the study. Productivity estimates were made by multiplying biomass by production/biomass... -
SOME ASPECTS OF THE ECOLOGY OF THE FRESHWATER CRAB (POTAMONAUTES PERLATUS MILNE EDWARDS) IN THE UPPER REACHES OF THE BUFFALO RIVER, EASTERN CAPE PROVINCE, SOUTH AFRICA.
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: M.P. Hill --- Department of Zoology and Entomology, South Africa J.H. O'Keeffe --- , South AfricaFreshwater crabs (Potamonautes perlatus) are the largest naturally occurring invertebrates in southern African rivers. The ecology of these animals in South African riverine ecosystems is little understood. This study investigates some aspects of the population and feeding ecology of P... -
Nitrogen and phosphorus concentration in faeces: an indicator of range quality as a practical adjunct to existing range evaluation methods
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: C.C. Grant M.J.S. Peel J.B.J. van RyssenVegetation monitoring, currently complemented by climatic data in particular rainfall areas, does not always supply sufficient information to provide reliable guidelines for appropriate stocking densities on ranch or reserve scale. This paper considers how the nutrient status of animals may... -
Seasonal herbage production from two range types in southern Mozambique
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: JP Muir A AlageEstimating ideal stocking rates in southern Mozambique based on range productivity is difficult since forage and foggage production of range types receiving different amounts of rainfall have not been quantified to date. Exclosures were constructed in upland and alluvial range... -
Abiotic and herbaceous vegetational characteristics of an arid rangeland in Kenya
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: WN Ekaya JI Kinyamario CN KarueA two-year study was conducted with an overall objective of characterising the structure and function of an arid rangeland in Kenya. A plot measuring 100 × 100m was used for this study. Data on rainfall and temperature were recorded at... -
Effect of Balanites glabra canopy cover on grass production, organic matter and soil moisture in a southern Kenyan rangeland
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: VO Wasonga RK Ngugi DM Nyariki G Kironchi TJ NjokaA study was undertaken in Kenya's southern savanna rangelands to determine the seasonal effect of Balanites glabra canopy cover on aboveground grass biomass, grass species composition, soil organic matter and soil moisture content. The study was conducted during the period... -
Determining spatial and temporal variability in quantity and quality of vegetation for estimating the predictable sustainable stocking rate in the semi-arid savanna
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: KR Mbatha D WardThis study assessed the importance of spatial and temporal variation in plant quality and quantity for determining sustainable stocking rates in game, commercial and communal ranches in semi-arid savanna of the Northern Cape Province, South Africa, in wet and dry... -
Effects of herbivory on above- and below-ground biomass partitioning in two arid-zone dwarf shrubs
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: G Oba CS Bjorå I NordalBiomass partitioning by arid-zone dwarf shrubs between above- and below-ground fractions could be influenced by plant adaptations to herbivory. The response of potted Indigofera spinosa and I. cliffordiana to heavy and moderate top defoliations, compared to non-defoliated controls, was investigated... -
Using rain-use efficiency to explore livestock production trends in rangelands in the Transkei, South Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: AR Palmer A AinslieWe qualitatively describe the condition of communally managed rangelands in the Transkei, South Africa, using GIS and high resolution near-infrared imagery. Using livestock census data from 28 magisterial districts in the Transkei, we explored the trends in livestock biomass from... -
Effects of herbivore exclosures on variation in quality and quantity of plants among management and habitat types in a semiarid savanna
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: KR Mbatha --- Department of Conservation Ecology, South Africa D Ward --- School of Biological and Conservation Sciences, South AfricaThe effects of grazing on plant biomass, plant quality, species evenness, species diversity and species composition were determined among management types (communal, commercial and game) and among habitat types (open savanna, rocky and pan) in a semiarid savanna in South... -
Forage–sheep relationships in communally managed moist thornveld in Zululand, KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: CC Nyamukanza --- Department of Agriculture, South Africa PF Scogings --- Department of Agriculture, South Africa KR Mbatha --- Department of Agriculture, South Africa NW Kunene --- Department of Agriculture, South AfricaCommunal rangelands have a wide range of vegetation communities that sustain livestock. Limited information exists on forage availability and quality in communal areas and how it influences Nguni sheep foraging behaviour. A study spanning almost three years was conducted to... -
Influence of bushdumps on the herbaceous understorey in a mesic Eastern Cape savanna
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: M. Mapuma --- Eastern Cape Department of Agriculture, Republic of South AfiicaStudies of the effects of woody vegetation on herbaceous vegetation in southern Africa have focused almost exclusively on savannas with isolated trees with no attention given to multi‐species bushclump savannas. The influence of multi‐species bushdumps on herbaceous vegetation was investigated... -
Perspective article: The evolving use of stocking rate indices currently based on animal number and type in semi‐arid heterogeneous landscapes and complex land‐use systems
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: M.J.S. Peel --- , Republic of South Africa H. Biggs --- , Republic of South Africa P.J.K. Zacharias --- Department of Range and Forage Resources, Republic of South AfricaMethods of determining stocking rate based on metabolic mass, animal type and biomass are reviewed in the context of equilibrial/disequilibrial paradigms. In South Africa, the calculation of ‘carrying capacity’ is based on conversion of animal species to metabolic mass equivalents... -
Volume–biomass functions reveal the effect of browsing on three Moroccan dwarf shrubs
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Z Akasbi --- Biodiversity, Evolution and Ecology of Plants, Germany J Oldeland --- Biodiversity, Evolution and Ecology of Plants, Germany J Dengler --- Biodiversity, Evolution and Ecology of Plants, Germany M Finckh --- Biodiversity, Evolution and Ecology of Plants, GermanyWe studied the effects of browsing on the plant architecture and volume-biomass relationships of three dominant dwarf shrubs – Artemisia herba-alba, A. mesatlantica and Teucrium mideltense – in a sagebrush steppe in the Central High Atlas Mountains, southern Morocco. For... -
The effects of a deferred grazing system on rangeland vegetation in a north-western, semi-arid region of Tanzania
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Ismail S Selemani --- Department of Animal and Aquacultural Sciences, Norway Lars O Eik --- Department of International Environment and Development Studies (Noragric), Norway Øystein Holand --- Department of Animal and Aquacultural Sciences, Norway Tormod Ådnøy --- Department of Animal and Aquacultural Sciences, Norway Ephraim Mtengeti --- Department of Animal Science and Production, Tanzania Daniel Mushi --- Department of Animal Science and Production, TanzaniaThe present study assessed the effects of deferred grazing management on rangeland condition using aboveground biomass, vegetation cover and species composition as indicators of range condition. The experiment was based on traditionally conserved exclosures (ngitili). Data were collected in Shinyanga... -
Modeling woody vegetation resources using Landsat TM imagery in northern Namibia
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: Alex Verlinden Risto LaamanenIn 1995 a forest inventory covering northern Namibia was initiated, based on stratified systematic field sampling of plots with a radius of up to 30 m. In these plots detailed tree parameters were measured. Due to security problems the most... -
Growth performance of lesser-known Leucaena species/provenances at Gairo inland plateau, Morogoro, Tanzania
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: E. Edward S.A.O. Chamshama A.G. MugashaGrowth performance and psyllid resistance was studied among nineteen lesser-known Leucaena species/provenances at Gairo inland plateau, Morogoro, Tanzania. Assessment was done at irregular intervals for survival, root collar diameter and diameter at 30 cm above the ground, height, diameter at... -
The effect of a soil-amended hydrogel on the establishment of a Eucalyptus grandis x E. camaldulensis clone grown on the sandy soils of Zululand
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: P. W.M. Viero --- , South Africa K.M. Little --- , South Africa D.G. Oscroft --- , South AfricaIn order to ensure the adequate survival of Eucalyptus grandis clonal hybrids on the sandy soils in the Zululand region of South Africa, seedlings are planted with large volumes of water (5 litres per planting pit). This results in a... -
Phytoplankton/protozoan dynamics in the Nyara Estuary, a small temporarily open system in the Eastern Cape (South Africa)
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: DR Walker R Perissinotto RPA BallyMost estuarine studies in South Africa have focused on larger estuaries, while numerous, smaller, temporarily open estuaries have received little research attention. This study examines the phytoplankton distribution in relation to physical and chemical variables through a quasi-seasonal cycle (from... -
Management advice for the Diplotaxodon limnothrissa (Teleostei: Cichlidae) resource in the south-east arm of Lake Malawi, based on per-recruit analysis
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: GeoffreyZ Kanyerere AnthonyJ Booth OlafLF WeylDiplotaxodon limnothrissa is a widely distributed species occurring throughout Lake Malawi and is probably the most abundant cichlid in the pelagic zone of the lake. The species is exploited commercially in the south-east arm of the lake, but since the... -
The trophic position of planktonic ciliate populations in the food webs of some East African lakes
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: AndrewW Yasindi WilliamD TaylorThe trophic role of planktonic ciliates was investigated in the food webs of 17 East African lakes of different salinity and trophy. Experiments with 1μm latex beads showed that Cyclidium, Halteria, Dysteria, Aspidisca and Vorticella are bacterivores. Examination of food... -
Population demographics of Palaemon peringueyi (Macpherson 1990) (Decapoda: Palaemonidae) in a small intermittently open Eastern Cape estuary
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: PW FronemanThe population demographics of the caridean shrimp Palaemon peringueyi was investigated monthly at four sites over a period of one year in the small, intermittently-open Grants River Estuary situated on the south-east coastline of southern Africa. Mean total abundance and... -
The response of Cyperus papyrus (L.) and Miscanthidium violaceum (K. Schum.) Robyns to eutrophication in natural wetlands of Lake Victoria, Uganda
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: J Kipkemboi --- Department of Zoology, Kenya F Kansiime --- , Uganda P Denny --- , The NetherlandsInterrelationships between nutrient concentrations and aerial biomass, root numbers, length and rhizomes size in Cyperus papyrus (L.) (papyrus) and Miscanthidium violaceum (K. Schum.) Robyns (synonymous to Miscanthus violaceus (K. Schum) Pilg.) were established in five different wetlands around the northern... -
Water quality status and phytoplankton composition in Soetendalvlei, Voëlvlei and Waskraalsvlei, three shallow wetlands on the Agulhas Plain, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: N Gordon --- Botany Department, South Africa JB Adams --- Botany Department, South Africa F Garcia-Rodriguez --- , UruguayThree wetlands on the Agulhas Plain, for which no limnological information was available, were investigated in order to provide baseline data on their present water quality and phytoplankton community structure. Physicochemical variables were assessed and phytoplankton biomass and community analyses... -
Ecophysiological responses of the salt marsh grass Spartina maritima to salinity
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: G Naidoo --- School of Biological and Conservation Sciences, South Africa Y Naidoo --- School of Biological and Conservation Sciences, South Africa P Achar --- Department of Biological and Physical Sciences, USAThe effects of salinity on growth and productivity of Spartina maritima (Curtis) Fernald were investigated in glasshouse and field experiments in 2008. In the glasshouse study, plants were subjected to 2%, 10%, 20%, 40% and 80% sea water, with tidal... -
Preliminary Biomass Studies in Young Eucalypts
Item type: Journal Article • Journal: South African Forestry Journal • Authors: A. P.G. Schönau --- , Republic of South Africa D.I. Boden --- , Republic of South AfricaThe wet and oven-dry biomass of various above-ground components of four to five-year-old Eucalyptus deanei, E. globulus ssp. globulus, E. nitens, E smithii and E. viminalis were determined from small samples on the Transvaal Highveld. Close relationships were established between... -
Management of Argyrozona argyrozona (Pisces: Sparidae) in South Africa based on per-recruit models
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: SL Brouwer MH GriffithsCarpenter Argyrozona argyrozona is an endemic sparid that constitutes an important component of the South African linefishery between Cape Agulhas and Port Alfred, where it exists as two stocks; one on the central Agulhas Bank and the other on the... -
A simple method for rapid estimation of Ecklonia maxima and Laminaria pallida biomass using floating surface quadrats
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: MD Rothman --- Department of Agriculture, South Africa RJ Anderson --- Department of Agriculture, South Africa JJ Bolton --- Department of Botany, South Africa CJT Boothroyd --- Department of Agriculture, South Africa FA Kemp --- Department of Agriculture, South AfricaIn South Africa two species of kelp, Ecklonia maxima and Laminaria pallida, occur in quantities sufficient for commercial use. Currently, the former species is harvested in large quantities (about 5 000 tonnes wet weight per year) as abalone feed. In... -
An alternative method for estimating the status of resident reef fish stocks, based on differential fishing effort across a marine reserve boundary
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: A Götz --- Elwandle Node, South Africa SE Kerwath --- Branch Fisheries, Department of Agriculture, South Africa CG Attwood --- Marine Research Institute, Zoology Department, South Africa WHH Sauer --- Department of Ichthyology and Fisheries Science, South AfricaThe stock status of roman Chrysoblephus laticeps was estimated in the Goukamma, a temperate South African marine protected area (MPA). Standardised catch per unit effort (CPUE) from a controlled angling survey on both sides of the MPA border was employed... -
Plant traits and spread of the invasive salt marsh grass, Spartina alterniflora Loisel., in the Great Brak Estuary, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: JB Adams --- Department of Botany, South Africa A Grobler --- Department of Botany, South Africa C Rowe --- Department of Botany, South Africa T Riddin --- Department of Botany, South Africa TG Bornman --- , South Africa DR Ayres --- Evolution and Ecology, USASpartina alterniflora Loisel., widely recognised as an aggressive invader of estuaries and salt marshes around the world, was discovered growing in the temporarily open/closed Great Brak Estuary on the southern Cape coast of South Africa in 2004. This is the... -
Stock-environment recruitment analysis for Namibian Cape hake Merluccius capensis
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: P Kainge --- National Marine Information and Research Centre, Namibia N Bahamon --- Centre d'Estudis Avançats de Blanes (CEAB-CSIC), Spain CH Bartholomae --- National Marine Information and Research Centre, Namibia JN Kathena --- National Marine Information and Research Centre, Namibia AK van der Plas --- National Marine Information and Research Centre, Namibia A Gordoa --- Centre d'Estudis Avançats de Blanes (CEAB-CSIC), SpainThe factors modulating recruitment success of Cape hake Merluccius capensis in Namibian waters are still unresolved. In this study, we used generalised additive models, regression tree analysis and the conventional Ricker model to examine the effect of environmental indices and... -
The effect of a soil-amended hydrogel on the establishment of a Eucalyptus grandis clone on a sandy clay loam soil in Zululand during winter
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: P.W.M. Viero --- , South Africa K.E.A. Chiswell --- , South Africa J.M. Theron --- , South AfricaTo ensure acceptable survival and growth of Eucalyptus grandis clonal material planted in the sandy clay loam soils of the Zululand interior of South Africa, the current planting season is limited to the summer rainfall period. A field trial was... -
Evaluation of 19 provenances of Calliandra calothyrsus at Gairo and SUA Farm, Morogoro,Tanzania
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: M. Herbert --- Department of Forest Biology, Faculty of Forestry & Nature Conservation, Tanzania A. G. Mugasha --- Department of Forest Biology, Faculty of Forestry & Nature Conservation, Tanzania S.A.O. Chamshama --- Department of Forest Biology, Faculty of Forestry & Nature Conservation, TanzaniaPerformance evaluation was conducted among nineteen provenances of Calliandra calothyrsus from mesa-America, Indonesia and Tanzania. Two trials were established in February and March, 1996 at Gairo (8 provenances) and Sokoine University of Agriculture (SUA) Farm (17 provenances) in Morogoro, Tanzania... -
Stand biomass and volume estimation for Miombo woodlands at Kitulangalo, Morogoro, Tanzania
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: S.A.O. Chamshama --- Faculty of Forestry and Nature Conservation, Tanzania A.G. Mugasha --- Faculty of Forestry and Nature Conservation, Tanzania E. Zahabu --- Faculty of Forestry and Nature Conservation, TanzaniaTree volume and biomass equations developed for Kitulangalo area in Morogoro, Tanzania ignored small branches and small trees. Consequently, this study was carried out to develop new individual tree volume and biomass equations, and assess current regeneration status, biodiversity and... -
Equations for predicting the biomass of Acacia cyclops and Acacia saligna in the western and eastern Cape regions of South Africa Part 1 : Tree-level models
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: A. van Laar --- Faculty of Agricultural and Forestry Sciences, J.M. Theron --- Faculty of Agricultural and Forestry Sciences,A forest inventory was carried out in coastal areas infested by the alien tree species Acacia cyclops and A. saligna on the West Coast, Agulhas and Eastern Cape Plains. Sample trees were felled to construct prediction equations, which were subsequently... -
Equations for predicting the biomass of Acacia cyclops and Acacia saligna in the western and eastern Cape regions of South Africa Part 2: Stand-level models
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: A. van Laar --- Faculty of Agricultural and Forestry Sciences, J.M. Theron --- Faculty of Agricultural and Forestry Sciences,The study deals with stand-level models for estimating wood biomass for different tree sizes and different biomass categories. It was carried out on farms and nature reserves in three regions. The stratification was identical with that in part 1 of... -
Performance of four-year-old Australian and Papua New Guinean Acacia species/provenances at Kongowe, Kibaha, Tanzania
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: AI Kindo --- Forestry and Beekeeping Division, Tanzania MA Mndolwa --- , Tanzania E Edward --- Department of Forest Biology, Faculty of Forestry and Nature Conservation, Tanzania SAO Chamshama --- Department of Forest Biology, Faculty of Forestry and Nature Conservation, TanzaniaThis study to compare performance of three Australian–Papua New Guinean Acacia species/provenances (A. mangium, A. auriculiformis, A. crassicarpa) and A. julifera was conducted at Kongowe, Kibaha, Tanzania. Species/provenances were evaluated for survival, growth (diameter, height and volume), wood basic density... -
Volume equations and biomass estimates for three species in tropicalmoist forest in the Orientale province, Democratic Republic of Congo
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: T Kahindo Maliro --- , Democratic Republic of Congo J-P Lokombe Dimandja --- , Democratic Republic of Congo N Picard --- , GabonVolume equations predict the volume of the stem of a tree from dendrometrical characteristics that are easy to measure, such as diameter and/or height. These equations can serve as a surrogate for biomass equations, by converting the stem volume to... -
Biomass production and carbon storage of Populus ×canadensis Guinier I-214 plantations grown at Pogradeci region in Albania
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: E Toromani --- Department of Forestry, Albania M Sanxhaku --- Observatory of Meteorology, Albania M Sallaku --- Department of Biotechnology, Albania E Shaho --- Forest Engineer, AlbaniaFast-growing plantations of Populus ×canadensis Moench (syn. P. ×euramericana (Dode) Guinier ex Piccarolo) clone I-214 have good potential for biomass production. The objective of the study was estimation of biomass using allometric equations and estimation of carbon allocation according to... -
Biomass harvesting in Eucalyptus plantations in Western Australia
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: MR Ghaffariyan --- CRC for Forestry, Australia M Brown --- CRC for Forestry, Australia M Acuna --- CRC for Forestry, Australia J Sessions --- Department of Forest Engineering, Resources and Management, USA M Kuehmaier --- Institute of Forest Engineering, Austria J Wiedemann --- CRC for Forestry, AustraliaAustralia is at an early stage of exploring the use of forest biomass to generate energy. This study evaluated the biomass yield and the productivity rates of equipment for harvesting biomass in a poor-quality eucalypt plantation. The operation consisted of... -
An allometric equation for estimating stem biomass of Acacia auriculiformis in the north-eastern region of Bangladesh
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Jiban Chandra Deb --- Department of Forestry and Environmental Science, Bangladesh Md. Abdul Halim --- Department of Forestry and Environmental Science, Bangladesh Enam Ahmed --- Department of Forestry and Environmental Science, BangladeshTree biomass plays an important role in sustainable management and in estimating forest carbon stocks. The objective of this study was to select the best model for measuring stem biomass of Acacia auriculiformis in the study area. Data from five... -
Stem biomass and volume models of selected tropical tree species in West Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: GHS Guendehou --- , Bénin A Lehtonen --- , Finland M Moudachirou --- Laboratoire de Pharmacognosie, Faculté des Sciences et Techniques, Bénin R Mäkipää --- , Finland B Sinsin --- Laboratoire d'Ecologie Appliquée, Faculté des Sciences Agronomiques, BéninEstimating tree volume and biomass constitutes an essential part of the forest resources assessment and the evaluation of the climate change mitigation potential of forests through biomass accumulation and carbon sequestration. This research article provides stem volume and biomass equations... -
Coarse root–shoot allometry of Pinus radiata modified by site conditions in the Western Cape province of South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: H Pretzsch --- Chair for Forest Growth and Yield, Germany P Biber --- Chair for Forest Growth and Yield, Germany E Uhl --- Chair for Forest Growth and Yield, Germany P Hense --- Chair for Forest Growth and Yield, GermanyThe relationship between root and shoot growth and how it is modified by chronic or episodic drought stress is so far not well understood. Allometric partitioning theory (APT) supposes a constant root–shoot allometry. Optimal partitioning theory (OPT) assumes that plants’... -
Developing allometric equations for estimating leaf area and leaf biomass of Artocarpus chaplasha in Raghunandan Hill Reserve, Bangladesh
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Swapan Kumar Sarker --- Department of Forestry and Environmental Science, Bangladesh Niamjit Das --- Department of Forestry and Environmental Science, Bangladesh Md Qumruzzaman Chowdhury --- Department of Forestry and Environmental Science, Bangladesh Md Mohasinul Haque --- Department of Forestry and Environmental Science, BangladeshEstimation of leaf area (LA) and leaf biomass (LB) is important to understand plant physiological and carbon assimilation processes, and tree growth models. The aim of this study was to develop and compare allometric equations for predicting LA and LB... -
Models for estimation of carbon sequestered by Cupressus lusitanica plantation stands at Wondo Genet, Ethiopia
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Leakemariam Berhe --- , Ethiopia Genene Assefa --- Wondo Genet College of Forestry and Natural Resources, Ethiopia Tesfay Teklay --- Wondo Genet College of Forestry and Natural Resources, EthiopiaThis study compared models for estimating carbon sequestered aboveground in Cupressus lusitanica plantation stands at Wondo Genet College of Forestry and Natural Resources, Ethiopia. Relationships of carbon storage with tree component and stand age were also investigated. Thirty trees of... -
Generic linear mixed-effects individual-tree biomass models for Pinus massoniana in southern China
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Liyong Fu --- Research Institute of Forest Resource Information Techniques, China Weisheng Zeng --- Academy of Forest Inventory and Planning, State Forestry Administration, China Huiru Zhang --- Research Institute of Forest Resource Information Techniques, China Guangxing Wang --- Research Center of Forestry Remote Sensing and Information Engineering, China Yuancai Lei --- Research Institute of Forest Resource Information Techniques, China Shouzheng Tang --- Research Institute of Forest Resource Information Techniques, ChinaQuantification of forest biomass is important for practical forestry and for scientific purposes. It is fundamental to develop generic individual-tree biomass models suitable for large-scale forest biomass estimation. However, compatibility of forest biomass estimates at different scales may become a... -
Dry season fish survival in isolated pools and within sand-beds in the Mzingwane River, Zimbabwe
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: JohnL MinshullFour isolated pools in the otherwise dry Mzingwane River, Zimbabwe, were sampled in December 1985 and a total of 4 547 specimens of 23 species were collected. The dominant species, by number, were Chiloglanis paratus, followed by Barbus toppini, Mesobola... -
Rapid biological assessment of the fishery potential of Xonxa Dam, near Queenstown, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: TJ Richardson AJ Booth OLF WeylRapid biological assessments have been proposed as the most cost-effective approach to identify suitable target species and to set initial catch and fishing effort levels for new fisheries. Xonxa Dam, a turbid irrigation dam situated in the White Kei catchment,... -
Decline of demersal resources in North-West Africa: an analysis of Mauritanian trawl-survey data over the past 25 years
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: D Gascuel P Labrosse B Meissa MO Taleb Sidi S GuénetteMauritania is characterised by fast-growing fisheries that have developed over the past decades. Since 1982, scientific trawl surveys have been conducted regularly, allowing assessment of the impact of this increasing fishing pressure on exploited species as well as on demersal... -
Status of the estuarine-dependent riverbream Acanthopagrus berda (Sparidae) harvested by the multi-sectoral fishery in Kosi Bay, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: N James NG Hall LE Beckley BQ Mann WD RobertsonA stock assessment was undertaken for the tropical sparid Acanthopagrus berda harvested in the Kosi Bay estuarine system, northern KwaZulu-Natal, South Africa, by a multi-sectoral fishery using traditional traps and gillnets, and recreational angling using rod-and-line. Input parameters used in... -
Forage–cattle relationships in a communally managed semi-arid savanna in northern Zululand, South Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: CC Nyamukanza PF Scogings NW KuneneDevelopment of extensive livestock production in KwaZulu-Natal is constrained by seasonal variability of rangeland production and low forage nutritional quality. A three-year study was implemented to determine the seasonal variation in herbaceous biomass and chemical composition of veld, animal weight,... -
Determining grazing capacity in Namibia with the aid of remote sensing
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: C Espach --- Ministry of Agriculture, LG Lubbe --- Ministry of Agriculture, N Ganzin --- Ifremer, FranceThe Namibian rangelands consist of a mixture of herbaceous and woody components. The main source of income is from farming systems with grass production the predominant source of forage. For rangeland managers to utilise this source sustainably, the accurate determination... -
Prediction models for estimating available fodder of two savanna tree species (Acacia dudgeoni and Balanites aegyptiaca) based on field and image analysis measures
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: P Savadogo B ElfvingBrowse production is difficult to measure non-destructively without some level of subjectivity combined with a lack of accuracy and reproducibility. This study examined the possibility of using ground-based photographs to estimate browse production. Thirty five sample trees of Acacia dudgeoni... -
Influence of land use on phytomass accumulation in Highland Sourveld grassland in the southern Drakensberg, South Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: TG O'ConnorTransformation of indigenous vegetation for production purposes impacts negatively on biodiversity but does this necessarily equate with a decrease in phytomass accumulation, which may influence carbon sequestration? Phytomass accumulation was studied for common land covers of beef ranching or dairy... -
Exploring differences of soil quality as related to management in semiarid rangelands in the western Bophirima District, North West province, South Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: AS Moussa L van Rensburg K Kellner A BationoDifferences in land-use management may result in different rangeland condition (soil, vegetation and biodiversity) and productivity. Vegetation condition in contrasting land-use management systems is well documented in semiarid rangelands, but relatively little information is available on soil quality. This study... -
Heritability of shoot die-back and root biomass in sixteen Pterocarpus angolensis (Fabaceae) half-sib families from Malawi, Namibia and Zambia
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: JP Mwitwa CRY Munthali G van WykThe experiment was conducted to ascertain narrow-sense heritability (h 2) and the family-within-provenance variation in shoot die-back, taproot length and root biomass of half-sib Pterocarpus angolensis families from Malawi, Namibia and Zambia. Provenances differed significantly in shoot die-back for both... -
Renewable energy: the potential opportunities and obligations of plantation forestry
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: B Talbot PA AckermanGlobal demand for woody biomass in substituting fossil fuels does, and will increasingly, place significant pressure on timber plantations and question conventional management practices. Plantations are rationally laid out, located in areas of high productivity, typically have good infrastructure, and... -
Estimating biomass and macronutrient content of some commercially important plantation species in South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: SB Dovey --- , South AfricaThe removal of biomass, in any combination of stemwood, bark or branch harvesting, can cause a significant increase in nutrient loss from commercial timber plantations. Ensuring long-term site productivity of forest plantations is a key issue for forestry management. Managers... -
BECVOL 3: an expansion of the aboveground biomass quantification model for trees and shrubs to include the wood component
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Nico Smit --- Animal, Wildlife and Grassland Sciences, South AfricaA quantitative description of woody plant communities that aimed at aiding studies on grass–tree competition interactions, bush encroachment and estimation of food to browser herbivore species, was proposed during 1989. It evolved as the BECVOL-model and differs from other methods... -
Macrozoobenthic communities in waters off Angola
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: G Lange --- Leibniz Institute for Baltic Sea Research, Germany A Darr --- Leibniz Institute for Baltic Sea Research, Germany ML Zettler --- Leibniz Institute for Baltic Sea Research, GermanyMacrozoobenthic biodiversity is described for waters off Angola, one of the poorest-known marine environments of the world. During research cruises in 2004 and 2011, the shelf region of Angola was investigated at 39 stations in water depths of between 19... -
Water hyacinth hotspots in the Ugandan waters of Lake Victoria in 1994–2012: implications for management
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: FM Wanda --- National Fisheries Resources Research Institute (NaFIRRI), Uganda M Namukose --- National Fisheries Resources Research Institute (NaFIRRI), Uganda M Matuha --- National Fisheries Resources Research Institute (NaFIRRI), UgandaWater hyacinth invaded Lake Victoria in the 1980s and, by 1998, had attained peak coverage of approximately 2 000 ha in the Ugandan waters of the lake. Control interventions, especially via biological means, significantly reduced the weed's coverage to non-nuisance... -
Trophic structure and biomass distribution of macrobenthos on sheltered and semi-exposed rocky shores of Tsitsikamma Marine Protected Area
Item type: Journal Article • Journal: African Zoology • Authors: Nicholas Hanekom --- South African National Parks, South AfricaThe trophic structure and biomass of macrobenthos on both wave-sheltered, rocky intertidal shores and semi-exposed ones at seven localities in the Tsitsikamma Marine Protected Area were compared. In the Cochlear zone and entire intertidal (Cochlear- and Balanoid zones combined) biomass... -
Visual obstruction as a method to quantify herbaceous biomass in southern African semi-arid savannas
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Dave Joubert --- Polytechnic of Namibia, Namibia Larkin A Powell --- School of Natural Resources, USA Walter H Schacht --- Department of Agronomy and Horticulture, USABiomass of aboveground vegetation is a useful descriptor for studies of grazing, fire and wildlife habitat use in grassland systems. The traditional method to estimate biomass, hand-clipping, is time intensive and other indices of biomass have been used successfully. In... -
Productivity and cost of whole‑tree harvesting without debarking in a Eucalyptus nitens plantation in Tasmania, Australia
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Martin Strandgard --- University of the Sunshine Coast, Australia Damian Walsh --- University of the Sunshine Coast, Australia Rick Mitchell --- University of the Sunshine Coast, AustraliaThere is increasing interest worldwide in using tree harvesting biomass as an energy source. Bark retained on logs is commonly used as an energy source, but is generally removed from eucalypt logs during harvest. In order to evaluate the potential... -
Intertidal population structure of the edible mollusc Turbo sarmaticus (Vetigastropoda) at an unexploited and exploited sites along the coast of the Eastern Cape Province, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: G.G. Foster --- Department of Zoology & Entomology, South Africa A.N. Hodgson --- Department of Zoology & Entomology, South AfricaThe intertidal population structure of the large edible gastropod Turbo sarmaticus was examined at four sites along the Eastern Cape Province of South Africa. One site was free from exploitation, two were subjected to low levels of exploitationand one was... -
Prey selection by a reintroduced lion population in the Greater Makalali Conservancy, South Africa
Item type: Journal Article • Journal: African Zoology • Authors: Dave Druce --- School of Life & Environmental Sciences, South Africa Heleen Genis --- School of Life & Environmental Sciences, South Africa Jonathan Braak --- Makalali Private Game Reserve, South Africa Sophie Greatwood --- School of Life & Environmental Sciences, South Africa Audrey Delsink --- School of Life & Environmental Sciences, South Africa Ross Kettles --- Makalali Private Game Reserve, South Africa Luke Hunter --- School of Life & Environmental Sciences, South Africa Rob Slotow --- School of Life & Environmental Sciences, South AfricaLion prey selection was studied on the Greater Makalali Conservancy (140 km2), Limpopo Province, South Africa, in order to assist with management strategies. Monitoring was carried out between February 1998 and December 2001. Lion killed 15 species, with warthog, blue... -
Carbon stocks in a 50‑year‑old Eucalyptus camaldulensis stand in Sicily, Italy
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Riccardo Scalenghe --- Dipartimento Scienze Agrarie e Forestali, Italy Luisella Celi --- Dipartimento di Scienze Agrarie, Forestali e Alimentari, Italy Giovanna Costa --- Dipartimento Scienze Agrarie e Forestali, Italy V Armando Laudicina --- Dipartimento Scienze Agrarie e Forestali, Italy Stefania Santoni --- Dipartimento di Scienze Agrarie, Forestali e Alimentari, Italy Dario Vespertino --- Dipartimento Scienze Agrarie e Forestali, Italy Tommaso La Mantia --- Dipartimento Scienze Agrarie e Forestali, ItalyEucalyptus stands in semi‑arid areas may contribute to enhance carbon (C) stocks in both biomass and soil. However, the limited information available is mainly focused on short‑rotation plantations. In this study, the above‑ and below‑ground C pools in five 50‑year‑old... -
Biomass equations for selected drought-tolerant eucalypts in South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Darius Phiri --- Department of Forest and Wood Science, South Africa Pierre Ackerman --- Department of Forest and Wood Science, South Africa Brand Wessels --- Department of Forest and Wood Science, South Africa Ben du Toit --- Department of Forest and Wood Science, South Africa Marie Johansson --- Department of Building Technology, Sweden Harald Säll --- Department for Forestry and Wood Technology, Sweden Sven-Olof Lundqvist --- Wood and Fibre Measurement Laboratory, Innventia AB, Sweden Thomas Seifert --- Department of Forest and Wood Science, South AfricaIn the water-scarce environment of South Africa, drought-tolerant eucalypt species have the potential to contribute to the timber and biomass resource. Biomass functions are a necessary prerequisite to predict yield and carbon sequestration. In this study preliminary biomass models for... -
In vitro biomass accumulation of calli and root enhancement of Leucas aspera (Willed) Linn. under stress conditions
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Masilamani Sri Devi --- Department of Biotechnology, India Krishnamoorthy Vinothini --- Department of Biotechnology, India Pandian Arjun --- Department of Crop Sciences, South Africa Sudharshan Sekar --- Department of Biotechnology and Food Technology, South Africa Vuyo Mavumengwana --- Department of Biotechnology and Food Technology, South AfricaLeucas aspera is a high value medicinal plant in India, Java, Mauritius and Philippines. The effects of plant growth regulators effects on in vitro callus biomass accumulation and root enhancement were assessed using leaf and stem explants. Leaf and stem... -
Water and radiation use efficiency of sugarcane for bioethanol production in South Africa, benchmarked against other selected crops
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Francois C Olivier --- South African Sugarcane Research Institute, South Africa Abraham Singels --- South African Sugarcane Research Institute, South Africa Alana B Eksteen --- South African Sugarcane Research Institute, South AfricaThere are indications that high-fibre sugarcane genotypes may produce more biomass and use resources more efficiently than conventional sugarcane cultivars. The objective of this research was to gather quantitative information on resource use for selected conventional and high-fibre sugarcane genotypes... -
Effect of short-duration overnight cattle kraaling on grass production in a southern African savanna
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Pamela Sibanda --- National University of Science and Technology, Zimbabwe Allan Sebata --- National University of Science and Technology, Zimbabwe Edward Mufandaedza --- Africa Centre for Holistic Management, Zimbabwe Mukai Mawanza --- National University of Science and Technology, ZimbabweRanch owners in eastern and southern Africa have embraced a new rangeland management practice of keeping cattle overnight in temporary livestock corrals (hereafter referred to as kraals) within rangelands for short durations (for example, one week) to improve grass production... -
Allometric models for height and aboveground biomass of dominant tree species in South African Mistbelt forests
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Sylvanus Mensah --- Department of Forest and Wood Science, South Africa Ruan Veldtman --- South African National Biodiversity Institute, South Africa Thomas Seifert --- Department of Forest and Wood Science, South AfricaNovel species-specific equations for the estimation of height and aboveground biomass were established for four dominant tree species (Syzygium gerrardii Burtt Davy, Combretum kraussii Hochst., Trichilia dregeana Sond. and Croton sylvaticus Hochst.), in the Northern Mistbelt Forests of South Africa... -
Indirect methods of tree biomass estimation and their uncertainties
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Marco A Njana --- Tanzania Forest Services Agency, TanzaniaTree aboveground biomass (AGB) may be determined using direct (weighing or biomass models) and indirect (involving the use of a form factor [FF]) or volume models, basic density [BD] and biomass expansion factor [BEF]) methods. Focusing on three dominant mangrove... -
Boulder shores in South Africa – a distinct but poorly documented coastal habitat type
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: L Tucker --- Marine Research Institute and Department of Biological Sciences, South Africa CL Griffiths --- Marine Research Institute and Department of Biological Sciences, South Africa F Schroeter --- Marine Research Institute and Department of Biological Sciences, South Africa HD Vetter --- Marine Research Institute and Department of Biological Sciences, South AfricaThis study compares the composition, species richness and biomass of macrofaunal and algal assemblages on intertidal boulder shores as compared with those on adjacent rock-platforms, at six sites along the southwest coast of South Africa. Of 214 species identified, 175... -
The potential of Vachellia kosiensis (Acacia kosiensis) as a dryland forestry species in terms of its water use, growth rates and resultant water-use efficiency
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Mark B Gush --- CSIR Natural Resources and the Environment, South AfricaThe potential of the country’s numerous indigenous tree species to address challenges facing the commercial forestry industry in South Africa is under-explored. Relevant issues include the rising demand for timber and non-timber forest products due to population and economic growth,... -
The development of reforestation options for dryland farmland in south-western Australia: a review
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Richard J Harper --- School of Veterinary and Life Sciences, Australia Stanley J Sochacki --- School of Veterinary and Life Sciences, Australia John F McGrath --- School of Veterinary and Life Sciences, AustraliaCurrent forest industries in south-western Australia are based on regrowth natural eucalypt forests and Pinus and Eucalyptus spp. plantations, and restricted to areas with >600 mm y−1 annual rainfall. Dryland farming systems have been developed across 20 million ha in... -
Birds as major predators of fishes in the East Kleinemonde Estuary
Item type: Journal Article • Journal: African Zoology • Authors: Paul D Cowley --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa Anja I Terörde --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa Alan K Whitfield --- South African Institute for Aquatic Biodiversity (SAIAB), South AfricaThis study provides a quantitative account of fish predation by piscivorous birds in the temporarily open/closed East Kleinemonde Estuary and represents the first global attempt to simultaneously relate such consumption to production by a fish community in the same estuary... -
Yield, nutrient and heavy metal uptake of leafy vegetables grown in sewage sludge and poultry manure amended soils
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Blessing Nyamasoka --- Department of Soil Science and Agricultural Engineering, Zimbabwe Ronald Marumbi --- Department of Soil Science and Agricultural Engineering, Zimbabwe Armwell Shumba --- Department of Soil Science and Agricultural Engineering, Zimbabwe Phillip Nyamugafata --- Department of Soil Science and Agricultural Engineering, Zimbabwe Simon Madyiwa --- Department of Soil Science and Agricultural Engineering, Zimbabwe Justice Nyamangara --- Department of Environmental Science and Technology, ZimbabweUrban farmers in Harare grow vegetables in soils fertilised with poultry manure (PM) and sewage sludge (SS). Feed and storage management influence nutrient supply of these organic amendments. Nitrogen mineralisation of PM and SS were determined in a non-leaching and... -
Temperate forest dynamics and carbon storage: a 26-year case study from Orange Kloof Forest, Cape Peninsula, South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Anabelle W Cardoso --- Department of Biological Sciences, South Africa Jeremy J Midgley --- Department of Biological Sciences, South Africa M Timm Hoffman --- Department of Biological Sciences, South Africa Coert J Geldenhuys --- Department of Forest and Wood Science, South AfricaTemperate forests are globally important carbon stores that are, in the face of recent improvements in their conservation, likely to increase their storage capacity in the future. Despite this, these ecosystems are poorly understood, especially over longer time periods. To... -
Changes in forest cover and carbon stocks of the coastal scarp forests of the Wild Coast, South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Kagiso Mangwale --- Department of Environmental Science, South Africa Charlie M Shackleton --- Department of Environmental Science, South Africa Ayanda Sigwela --- R3G, South AfricaLand-use intensification and declines in vegetative cover are considered pervasive threats to forests and biodiversity globally. The small extent and high biodiversity of indigenous forests in South Africa make them particularly important. Yet, relatively little is known about their rates... -
Contrasting hydrography and phytoplankton distribution in the upper layers of cyclonic eddies in the Mozambique Basin and Mozambique Channel
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: T Lamont --- Branch: Oceans and Coasts, Department of Environmental Affairs, South Africa RG Barlow --- Marine Research Institute and Department of Oceanography, South AfricaHydrographic data collected in cyclonic eddies in the Mozambique Channel and Basin revealed notable differences in temperature and salinity at a depth of 100 m, the upper mixed layer, the nitracline depths, and vertical distribution of chlorophyll-a (Chl-a). Differences in... -
Overview and status of estuarine microphytobenthos ecological research in South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: T Dalu --- Department of Ecology and Resource Management, South Africa JB Adams --- Department of Botany, South Africa JC Taylor --- South African Institute for Aquatic Biodiversity, South Africa GC Bate --- Department of Botany, South Africa M Nunes --- Department of Botany, South Africa PW Froneman --- Department of Ecology and Resource Management, South Africa RJ Wasserman --- South African Institute for Aquatic Biodiversity, South AfricaThis article presents a historical overview of estuarine microphytobenthos (MPB) research in South Africa published over the period 1950 to the present, highlighting major milestones, challenges and estuarine management problems, as well as future research needs within the South African... -
Preliminary trials of the BioBaler working in Brazilian eucalypt plantations
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Saulo PS Guerra --- College of Agricultural Sciences, Brazil Guilherme Oguri --- College of Agricultural Sciences, Brazil Marcelo S Denadai --- College of Agricultural Sciences, Brazil Maura ST Esperancini --- College of Agricultural Sciences, Brazil Raffaele Spinelli --- Consiglio Nazionale delle Ricerche, ItalyThe increasing demand for renewable energy feedstock has raised interest in growing eucalypts for fuel wood production, which is achieved by establishing very dense plantations cut every 18–24 months. The high moisture content of fresh Eucalyptus may handicap cut-and-chip operations,... -
Phytomass estimation using eMODIS NDVI and ground data in arid rangelands of Morocco
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Hamid Mahyou --- Centre Régional de la Recherche Agronomique d’Oujda, Morocco Bernard Tychon --- Department of Environmental Sciences and Management, Belgium Marie Lang --- Department of Environmental Sciences and Management, Belgium Riad Balaghi --- Centre Régional de la Recherche Agronomique de Meknès, MoroccoThe assessment of rangeland productivity in semi-extensively grazed arid rangelands is a prerequisite for livestock management in relation to sustainable use of pastoral resources. The objective of this study was to assess rangeland productivity based on normalised difference vegetation index... -
Effect of proximity to highways on soil chemical properties and grass condition at Mafikeng, South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Chris Munyati --- Department of Geography and Environmental Science, South Africa Oratile Menwe --- Department of Geography and Environmental Science, South AfricaRoads have motor vehicle traffic-sourced ecological effects. This study examined the effect of proximity to roads on soil and grass. Surface soil samples were collected along 60 m transects perpendicular to the four major paved highways of Mafikeng, in two... -
Weed density and biomass are reduced and plant growth and seed yield increased in common bean after solarisation with clear and black plastic
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Elizabeth Ngadze --- Department of Crop Science, Zimbabwe Arnold B Mashingaidze --- Department of Crop Science, Zimbabwe Julia Sibiya --- Department of Crop Science, ZimbabweCommon bean is highly sensitive to early weed competition, which severely reduces growth and yield. An experiment was carried out in Zimbabwe in the 2002/03 and 2003/04 seasons to assess the effectiveness of solarisation in controlling weeds in beans. Four... -
Trophic state and nutrient limitation in Lake Baringo, Kenya
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: EO Okech --- Department of biological sciences, Kenya N Kitaka --- Department of biological sciences, Kenya SO Oduor --- Department of biological sciences, Kenya D Verschuren --- Department of Biology, BelgiumThe trophic state of Lake Baringo and factors that could be limiting the development of algal biomass in it were investigated during one wet/dry hydrological cycle in 2014–2015. Water samples were analysed for dissolved inorganic nutrients, including , and ,... -
Data-moderate assessments of Cape monkfish Lophius vomerinus and west coast sole Austroglossus microlepis in Namibian waters
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: JN Kathena --- National Marine Information and Research Centre (NatMIRC), Ministry of Fisheries and Marine Resources (MFMR), Namibia A Kokkalis --- National Institute of Aquatic Resources (DTU Aqua), Denmark MW Pedersen --- National Institute of Aquatic Resources (DTU Aqua), Denmark JE Beyer --- National Institute of Aquatic Resources (DTU Aqua), Denmark UH Thygesen --- National Institute of Aquatic Resources (DTU Aqua), DenmarkThere is global interest in providing scientific advice on optimal harvesting of all commercially exploited fish stocks. Nevertheless, many commercially important stocks lack analytical assessments. Therefore, we evaluate a data-moderate stock assessment method: the stochastic surplus production model in continuous... -
Mapping tree aboveground biomass and carbon in Omo Forest Reserve Nigeria using Landsat 8 OLI data
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Iveren B Chenge --- Department of Forest Resources Management, Nigeria Johnson SA Osho --- Department of Forest Resources Management, NigeriaProtected areas in Nigeria are important ecosystems for carbon storage. The aim of this study was to estimate and map tree aboveground biomass (TAGB) and carbon (TAGC) within a tropical forest in Nigeria. Stepwise regression analysis was implemented to develop... -
Allometric models for estimation of aboveground biomass of Gmelina arborea Roxb. in pulpwood plantations of Bangladesh
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Lulu Rayhan Khushi --- Forestry and Wood Technology Discipline, Bangladesh Mahmood Hossain --- Forestry and Wood Technology Discipline, Bangladesh SM Rubaiot Abdullah --- Forestry and Wood Technology Discipline, Bangladesh Sanjoy Saha --- Centre for Integrated Studies on the Sundarbans, Bangladesh Mohammad Raqibul Hasan Siddique --- Forestry and Wood Technology Discipline, BangladeshGmelina arborea Roxb. is a fast-growing, deciduous tree species native to Bangladesh. It has been widely planted since 1992 for commercial production of pulpwood in hilly areas of Bangladesh. The purpose of this study was to derive well-fitting allometric models... -
Impact of shorebird predation on intertidal macroinvertebrates in a key North African Atlantic wintering site: an experimental approach
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: L Joulami --- Faculty of Sciences Ben M’sik, Morocco R El Hamoumi --- Faculty of Sciences Ben M’sik, Morocco Z Daief --- Faculty of Sciences Ain Chock, Morocco H Bazairi --- Faculty of Sciences, Morocco RJ Lopes --- Centro de Investigação em Biodiversidade e Recursos Genéticos (CIBIO), InBio Laboratório Associado, PortugalShorebirds, as migratory aquatic birds and top predators in intertidal ecosystems, can be affected by global environmental changes and escalations in local impacts on coastal lagoons and estuarine trophic networks. Many shorebirds winter in North African Atlantic coastal sites, most... -
Allometric equations from a non-destructive approach for biomass prediction in natural forest and plantation in West Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: SA Hamzath Kora --- Laboratory of Applied Ecology, Faculty of Agronomic Sciences, Benin GH Sabin Guendehou --- Laboratory of Applied Ecology, Faculty of Agronomic Sciences, Benin Cédric A Goussanou --- Laboratory of Applied Ecology, Faculty of Agronomic Sciences, Benin Achille E Assogbadjo --- Laboratory of Applied Ecology, Faculty of Agronomic Sciences, Benin Brice Sinsin --- Laboratory of Applied Ecology, Faculty of Agronomic Sciences, BeninAllometric equations are required for a rapid estimation of commercial timber volume and forest biomass stocks. In order to preserve the forest ecosystem, this study applied a non-destructive sampling approach to measure biophysical properties of living trees. From these measurements,... -
Seed mix type but not planting method or seed priming affect grassland restoration outcomes: a greenhouse trial
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Stuart Demmer --- School of Life Sciences, South Africa Michelle J Tedder --- School of Life Sciences, South Africa Kevin P Kirkman --- School of Life Sciences, South AfricaCommercial seed mixes and various mechanical planting methods have been implemented to overcome barriers to successful restoration of degraded grasslands but their effectiveness in aiding the restoration process has been understudied. Harvested seed must be cleaned of chaff to allow... -
The Effect of Provenance, Plant Spacing and Cutting Interval on Leaf Biomass Yield of Moringa Oleifera Lam.
Item type: Journal Article • Journal: East African Agricultural and Forestry Journal • Authors: C. T. Gadzirayi --- Bindura University of Science Education, Zimbabwe F. Kubiku --- Bindura University of Science Education, Zimbabwe J. Mupangwa --- University of Fort Hare, South Africa B. Masamha --- Bindura University of Science Education, Zimbabwe L. Mujuru --- Bindura University of Science Education, ZimbabweTwo provenances of Moringa oleifera Lam., Malawi and Mutoko, were evaluated to determine the effect of plant spacing and cutting interval on the leaf biomass yield for fodder production. A split-split plot experimental design was set up with provenance as... -
Environmental benefits of corn cob ash in lateritic soil cement stabilization for road works
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Olanrewaju A. Apampa --- Department of Civil Engineering, NigeriaThe potential environmental benefits of corn cob ash (CCA) as pozzolan in stabilizing soils for road construction was investigated. Corn cob obtained from Maya in South West Nigeria was processed to ash similar to Class C Fly Ash and blended... -
Age, growth and per-recruit stock assessment of southern mullet Chelon richardsonii in Saldanha Bay and Langebaan Lagoon, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: M Horton --- Department of Biological Sciences, South Africa D Parker --- Department of Biological Sciences, South Africa H Winker --- Branch: Fisheries Management, Department of Agriculture, South Africa SJ Lamberth --- Branch: Fisheries Management, Department of Agriculture, South Africa K Hutchings --- Anchor Environmental Consultants, South Africa SE Kerwath --- Department of Biological Sciences, South AfricaThe southern mullet Chelon richardsonii (Mugilidae) is the main target species of the inshore net fishery (gillnet and beach-seine) on the west coast of South Africa. The stock has displayed symptoms of overfishing, with a 28% reduction in the standardised... -
Comparing feeding niche, growth characteristics and exploitation level of the giraffe catfish Auchenoglanis occidentalis (Valenciennes, 1775) in the two largest artificial lakes of northern Ghana
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: SM Abobi --- Faculty of Biology (FB2), Germany JW Oyiadzo --- Department of Fisheries and Aquatic Resources Management, Ghana M Wolff --- Faculty of Biology (FB2), GermanyThe stomach contents of the giraffe catfish, Auchenoglanis occidentalis, populations from Lake Bontanga and Lake Tono, two artificial lakes, were analysed, together with length frequency data collected from July 2016 to June 2017, to gain knowledge of the stock bioecology... -
Stem volume and tree biomass harvested by different thinning intensities from dense and sparse karee stands in Central Bushveld, South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Kassahun T Maru --- Department of General Forestry, Wondo Genet College of Forestry and Natural Resources, Ethiopia Coert J Geldenhuys --- Department of Plant and Soil Sciences, South Africa Paxie W Chirwa --- SAFCOL Forest Chair for Forest Postgraduate Programme, Department of Plant and Soil Sciences, South AfricaThe aim of this study was to determine the aboveground stem volume and tree biomass of the multi-stemmed karee tree (Searsia lancea) for its potential use for producing wood chips and/or pellets. A stratified random sampling was done, by selecting... -
Characterisation of livestock biochars and their effect on selected soil properties and maize early growth stage in soils of Eastern Cape province, South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Admire R Dzvene --- Department of Agronomy, South Africa Cornelius Chiduza --- Department of Agronomy, South Africa Pearson NS Mnkeni --- Department of Agronomy, South Africa Prince C Peter --- Department of Agronomy, South AfricaFew studies have evaluated biochar application rates that would make economic sense using feedstocks readily available to subsistence farmers. Biochar from livestock manures were examined in Oakleaf and Tukulu soils. Pyrolysis had the most effect on poultry manure where it... -
Grass community responses to drought in an African savanna
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: C Wigley-Coetsee --- , South Africa AC Staver --- , United StatesDrought is often discussed as a major perturbation in savanna ecosystems, associated with lasting shifts in savanna structure and functioning. However, historically, droughts have occurred frequently in southern African savannas, suggesting that plants might benefit from being resilient to drought... -
The developmental growth and quality assessment of five selected cultivars of baby spinach grown in Gauteng province, South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Nature M Masufi --- Department of Agriculture and Animal Health, South Africa Ambani R Mudau --- Department of Life and Consumer Science, South Africa Hintsa T Araya --- ARC-Roodeplaat, Vegetable and Ornamental Plants, South Africa Fhatuwani N Mudau --- Department of Agriculture and Animal Health, South AfricaBaby spinach is a relatively new crop in South Africa that has commercial significance in retail stores. Currently, seed companies have developed varieties that have not been evaluated locally. Thus, the aim of this study was to investigate the growth,... -
The value of rested sourveld in a communal grazing area in the Eastern Cape, South Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Lynton J Dedekind --- , South Africa Jon McCosh --- , South Africa Terry M Everson --- , South Africa Craig D Morris --- , South Africa Dayle Trotter --- , South AfricaThe potential for forage accumulated during periodic long rests to provide valuable winter grazing for livestock in heavily stocked communal rangelands in sourveld was assessed. In a continuously-grazed commonage at Ntshiqo in the Eastern Cape, South Africa, we measured seasonal... -
Monitoring the effects of spatial protection on the reef fish communities of the Pondoland Marine Protected Area, Eastern Cape Province, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: BQ Mann --- , South Africa JQ Maggs --- , New Zealand SN Porter --- , South Africa WN Dalton --- , South AfricaMonitoring marine protected areas (MPAs) is critical for evaluating their effectiveness and for improving management. In this study, a single-camera baited remote underwater video system (mono-BRUVS) was deployed quarterly at four sites (10–30-m depths) to quantify the reef fish communities... -
Allometric relationships to predict aboveground biomass of 8–10-year-old Eucalyptus grandis × E. nitens in south-eastern Mpumalanga, South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: PB van Niekerk --- , South Africa DM Drew --- , South Africa SB Dovey --- , South Africa B du Toit --- , South AfricaSouth Africa is new to the implementation of climate change policies, and the forestry sector in this country is taking ownership of estimating its greenhouse gas inventories. Improving the level of accuracy of carbon stock estimations calls for the population... -
Fuelwood energy characteristics and biomass equations of the dominant species of northern Patagonian shrublands (Argentina)
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Matías G Goldenberg --- , Argentina Yamila A Cardoso --- , Argentina Facundo J Oddi --- , Argentina Lucas A Garibaldi --- , ArgentinaAlthough shrublands can be highly abundant, their bioenergy potential has barely been addressed. This is the case in northern Patagonian shrublands, where there is a lack of knowledge regarding biomass quantity and quality. The objective of this study was to... -
Efficacy and profitability of weed management systems for honeybush in South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Rayganah Rhoda --- , South Africa Cecilia Bester --- , South Africa Mlamuli Motsa --- , Eswatini Marlise Joubert --- , South Africa Gugu Tshabalala --- , South Africa Candice-Lee Lyons --- , South AfricaWeeds reduce crop productivity through competion for nutrients, water, light and space, and impact negatively on commercial crops. Honeybush tea (Cyclopia spp.) is an industry mainly focused on the organic cultivation of tea, using mechanical weeding control methods. To date,... -
Sustainable shellfish aquaculture in Saldanha Bay, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: A Santa Marta --- , United Kingdom JG Ferreira --- , United Kingdom GC Pitcher --- , South Africa J Lencart e Silva --- , United KingdomThe carrying capacity for bivalve shellfish culture in Saldanha Bay, South Africa, was analysed through the application of the well-tested EcoWin ecological model, in order to simulate key ecosystem variables. The model was set up using: (i) oceanographic and water-quality... -
Distribution and abundance patterns of two parapagurid hermit crabs (Crustacea: Decapoda: Anomura) along the west and south coasts of South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: AG Wright --- , South Africa CL Griffiths --- , South Africa TP Fairweather --- , South AfricaA series of over 6 000 research-trawl samples collected along the west and south coasts of South Africa between 1987 and 2014 were analysed for the presence and biomass of two parapagurid hermit crabs, Sympagurus dimorphus and Parapagurus bouvieri. The... -
Latitudinal changes in siphonophore assemblages across the Atlantic sector of the Southern Ocean
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: D Kuyper --- , South Africa D Thibault --- , France MJ Gibbons --- , South AfricaSiphonophores are commonly considered to be useful indicators of water masses and water-mass movement, but their employment as such across the wider Southern Ocean has not so far been attempted. We redress this here using archived samples, collected during January–February... -
Water hyacinth (Eichhornia crassipes) affects the composition and abundance of zooplankton in the littoral region of Koka Reservoir, Ethiopia
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: H Getnet --- , Ethiopia D Kifle --- , Ethiopia T Fetahi --- , EthiopiaWater hyacinth, Eichhornia crassipes (Martius) Solms 1883, is a rampant invasive aquatic plant that is recognised as one of the ten worst weeds in the world. Its appearance in Koka Reservoir was reported in 1965 and since then it has... -
Assessment of biomass energy use pattern and biogas technology domestication programme in Ethiopia
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Getachew Sime --- , Ethiopia Girma Tilahun --- , Ethiopia Mulugeta Kebede --- , EthiopiaBiogas is an energy-efficient and environmentally beneficial technology used as an alternative to biomass energy sources. The objective of this study was to evaluate the traditional biomass energy system in Ethiopia and the National Biogas Program of Ethiopia (NBPE) as... -
Phosphorus availability and fractions in a humic soil amended with poultry manure and lime
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: NP Mkhonza --- , South Africa NN Buthelezi-Dube --- , South Africa P Muchaonyerwa --- , South AfricaPhosphorus (P) availability in highly weathered soils is limited. The objective of this study was to determine the effects of poultry manure (PM) and lime on P availability in humic soils. The soils were amended with lime and PM, separately... -
Biomass-based value chain analysis of plantain in two regions in Ghana
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Charles Tortoe --- , Ghana Wilhelmina Quaye --- , Ghana Paa Toah Akonor --- , Ghana Charlotte Oduro Yeboah --- , Ghana Evelyn Serwah Buckman --- , Ghana Nana Yamoah Asafu-Adjaye --- , GhanaPlantain biomass value chain analysis was conducted to generate benchmark information that supports reduction of post-harvest losses of plantain and to identify value-added opportunities and linkages to new markets in Ghana. Specifically, this study sought to identify the actors and... -
Computational study of a novel combined cookstove for developing countries
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Bisrat Yilma Mekonnen --- , EthiopiaThis paper presents a computational study of a novel biomass-solar combined cookstove for developing countries. A computational fluid dynamics (CFD) study was carried out to understand how the proposed cookstoves perform during combustion. The technique was successfully used for predicting... -
Seasonal dynamics in water quality and phytoplankton of four tropical rivers in Ebonyi State, southeastern Nigeria
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: GN Nwonumara --- , Nigeria OI Okogwu --- , NigeriaThis study assessed the impacts of human activities and naturogenic processes on the water quality and phytoplankton of four rivers proximal to rice farms in Ebonyi State, south-eastern Nigeria. A range of water quality parameters were measured in conjunction with... -
Calibration and evaluation of the Sustainable Grazing Systems pasture model for predicting native grass aboveground biomass production in southern Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Walter Svinurai --- , South Africa Abubeker Hassen --- , South Africa Eyob Tesfamariam --- , South Africa Abel Ramoelo --- , South Africa Brendan Cullen --- , AustraliaSimulation modelling of grass biomass production has gained huge attention since the early 2000s, but it has rarely been applied to southern African rangelands, due to limited data availability for model calibration and evaluation. This study was conducted to calibrate... -
Effect of soil type on spatial distribution and nutritive value of grass species growing in selected rangelands of South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Khuliso E Ravhuhali --- , South Africa Victor Mlambo --- , South Africa Tefera S Beyene --- , South Africa Lobina G Palamuleni --- , South AfricaThe distribution and status of grass species is essential for sustainable management of rangelands. Therefore, this study assessed the spatial distribution and nutritive value of grass species as influenced by soil type in selected rangelands of the North West province... -
Temperature cycles beneath, and adjacent to, intertidal boulders and associated differences in biotic composition
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: C van Rensburg --- , South Africa A Robbins --- , South Africa C Griffiths --- , South AfricaThe only previous study on the macrobiota of South African boulder shores showed this assemblage to be more diverse than on nearby rocky platforms, but the drivers of that difference remain unresolved. We recorded water and air temperatures under intertidal... -
Additive biomass model for Heritiera fomes (Buch.-Hum.) in the Sundarbans Reserved Forest, Bangladesh
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Mohammad Raqibul Hasan Siddique --- , Bangladesh Mahmood Hossain --- , Bangladesh SM Rubaiot Abdullah --- , Bangladesh Md. Zaheer Iqbal --- , Bangladesh Mariam Akhter --- , Bangladesh Gael Sola --- , Italy Laurent Saint-Andre --- , France Matieu Henry --- , ItalyMangroves are recognised as an important carbon sequester and therefore demand accurate biomass and carbon stock estimations. This study aimed to develop additive biomass models for Heritiera fomes, the most dominant tree species of the Sundarbans Reserved Forest in Bangladesh... -
Adoption of innovation technology in the face of efficient energy use: A case of improved biomass stoves in Kwara State, Nigeria
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Ibukun James Olaoye --- , Nigeria Morolake Bolaji --- , Nigeria Adeola Oreoluwa Oloyede --- , NigeriaGiven that locally developed innovation technology can foster sustainable growth and development, this study assessed the factors that underpinned the choice of improved biomass stoves among rural households in Kwara South, Nigeria. The study involved the use of primary and... -
First assessment of the blue carbon storage of Rhizophora and Bruguiera mangrove stands on the island of Mauritius (western Indian Ocean)
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Phanesh Raghbor --- , Mauritius Linisha Devi Seeruttun --- , Mauritius Chandani Appadoo --- , MauritiusBlue carbon has gained recognition as a strategy to mitigate climate change. Mangroves allow significant amounts of carbon to be sequestered and stored and are considered an important component in the offset of greenhouse gas emissions. Despite this, little is... -
Impact of preceding crop sequences on wheat growth and development under conservation agriculture in the eastern Free State, South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: MH Visser --- , South Africa A Barnard --- , South Africa CC du Preez --- , South AfricaConservation agriculture (CA) is advocated to promote sustainable cropping. Little is known about the impact of preceding crop sequences on the growth and development of dryland wheat under CA in the eastern Free State Province of South Africa. In a... -
Drivers of periphyton biomass in south-western Cape rivers, South Africa, and the implications for management
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: JL Ewart-Smith --- , South AfricaIn open-canopied temperate rivers, periphyton plays a pivotal role by converting dissolved nutrients into food for biota. International research suggests that periphyton is particularly responsive to flow and nutrient alterations and therefore ideally suited to aiding the prediction and monitoring... -
Technical feasibility of producing binder-free water hyacinth briquettes for domestic energy use
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Thawani Sanjika* --- , Malawi Grivin Chipula --- , MalawiProduction of biomass briquettes of good strength and combustion characteristics usually requires the addition of a binder material to the feedstock. This study was aimed at developing a methodology for producing briquettes from water hyacinth at low compression pressures without... -
Assessing long-term nutrient and lime enrichment effects on a subtropical South African grassland
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Naledi Zama --- University of Kwazulu-Natal, South Africa Anathi Magadlela --- University of Kwazulu-Natal, South Africa Ntuthuko Mkhize --- University of Kwazulu-Natal, South Africa Michelle Tedder --- University of Kwazulu-Natal, South Africa Kevin Kirkman --- University of Kwazulu-Natal, South AfricaNutrient enrichment influences grassland ecosystem structure, typically manifested by reduced species richness and increased productivity. Quantifying the long-term impacts of nutrient enrichment on grasslands contributes to understanding eutrophication effects on grassland, particularly for grasslands adapted to low soil nutrient status... -
The effects of suspended bivalve culture on benthic community structure and sediment fluxes in Saldanha Bay, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: TA Probyn --- Fisheries and the Environment (DFFE), South Africa M Pretorius --- Fisheries and the Environment (DFFE), South Africa F Daya --- Fisheries and the Environment (DFFE), South Africa A du Randt --- Fisheries and the Environment (DFFE), South Africa A Busby --- Fisheries and the Environment (DFFE), South AfricaThis study provides a follow-up to prior measurements of the impact of mussel Mytilus galloprovincialis farming on benthic macrofauna and biogeochemistry and includes the first measurements of the effect of oyster Crassostrea gigas farming in Saldanha Bay, South Africa. The... -
Rainfed-based production of Megathyrsus maximus in sub-Saharan Africa: the case of the semi-arid environment of Sudan
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Hussein I Mohamed --- , Sudan Shamseddin M Ahmed --- Water Management and Irrigation Institute, University of Gezira, Sudan Adil D Mohamed --- Water Management and Irrigation Institute, University of Gezira, SudanThe performance of rainfed-based Megathyrsus maximus (syn. Urochloa maxima and Panicum maximum) was investigated in the semi-arid pastures of Sudan. Split-plot complete design experiments with three replications were applied for two consecutive seasons (2020–2021). The treatments were two in situ... -
The changing status of important marine fishery species in selected South African estuaries
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: AK Whitfield --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa BQ Mann --- Rhodes University, South AfricaThis review examines the changing status of 10 estuary-dependent marine fish species in 10 South African estuarine systems, ranging from the Kosi Estuary in the northeast to the Berg Estuary in the southwest. In all of these systems, the selected... -
Nitrogen fertiliser demand of canola is low when produced in conservation agriculture systems in South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Izané Riana Crous --- Stellenbosch University, South Africa Johan Labuschagne --- Stellenbosch University, South Africa Pieter Andreas Swanepoel --- Stellenbosch University, South AfricaCurrent fertiliser guidelines for nitrogen (N) application for canola under conservation agriculture (CA) in South Africa, may result in over-fertilisation. This study aimed to evaluate the effects of N rates and foliar applied N on biomass, seed and oil yield... -
Participatory establishment of Cenchrus ciliaris forage grass among pastoralists in a semi-arid rangeland area of eastern Tanzania
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Onesmo Damian Ngenzi --- Sokoine University of Agriculture, Tanzania Peter Rogers Ruvuga --- , Tanzania George Mutani Msalya --- Sokoine University of Agriculture, Tanzania David Dawson Maleko --- Sokoine University of Agriculture, TanzaniaIn the semi-arid areas of Africa many pastorallsts move their livestock to find better grazing when forage is scarce during the dry season. However, the practice of forage cultivation can sustain fodder supply for effective livestock feeding during these times... -
Carbon storage in a dry Miombo woodland area in Tanzania
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Ezekiel Edward Mwakalukwa --- Sokoine University of Agriculture, Tanzania Henrik Meilby --- Copenhagen University, Denmark Thorsten Treue --- Copenhagen University, DenmarkA persistent need exists, both politically and academically, for knowledge on carbon storage and sequestration potentials of forest ecosystems and their contributions to the global carbon balance. This study assessed carbon stocks of a 6 065 ha dry Miombo woodland... -
Fire suppression interacts with soil acidity to maintain stable recalcitrant pyrogenic carbon fractions in South African mesic grasslands soil
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Robyn E Nicolay --- University of KwaZulu-Natal, South Africa Ntuthuko R Mkhize --- University of KwaZulu-Natal, South Africa Michelle J Tedder --- University of KwaZulu-Natal, South Africa Kevin P Kirkman --- University of KwaZulu-Natal, South AfricaGrassland ecosystems have evolved alongside fire, a fundamental element that shapes and sustains their ecological balance. Recent research indicates that carbon produced during pyrogenic events in fire-dependent ecosystems may occur in more recalcitrant forms within deeper soil horizons. Notably, refractory... -
Per-recruit analysis and proposed sustainable harvest strategy for rednose labeo Labeo rosae and Mosambique tilapia Oreochromis mossambicus in Flag Boshielo Dam, Olifants River, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: SM Marr --- University of Limpopo, South Africa HA Hlungwani --- University of Limpopo, South Africa OLF Weyl --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa JR Sara --- University of Limpopo, South AfricaInland fisheries development in South Africa has been proposed to improve rural livelihoods and food security. However, inland fisheries are susceptible to collapse through overfishing. Therefore, establishing biological reference points for these fisheries is essential for long-term sustainability. Here, spawner-biomass-per-recruit... -
Evaluating the barriers to adoption of improved biomass cookstoves in Benue state, Nigeria
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Chikamso Christian Apeh --- University of Agriculture and Environmental Sciences, Nigeria Stella Nwawulu Chiemela --- University of Nigeria, Nigeria Chinedum Jachinma Chiemela --- University of Nigeria, Nigeria Andrew Chiahalam Apeh --- Enugu State University of Science and Technology, NigeriaThe prevalent use of inefficient traditional stoves for biomass cooking energy in Nigeria contributes to high rates of biomass consumption, deforestation, and harmful pollutant emissions. This study aimed to assess the constraints hindering the adoption of improved biomass cookstoves (IBCS)... -
Coastal carbon storage in degraded, natural, and restored mangrove ecosystems of Guyana
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Sabrina Dookie --- University of Guyana, Guyana Sirpaul Jaikishun --- University of Guyana, Guyana Abdullah Adil Ansari --- University of Guyana, GuyanaMangroves are among the most carbon-rich forests in the tropics due to their capacity to sequester and store carbon within their ecosystems. However, the combination of natural and human-induced phenomena causes changes in these ecosystems which can affect the flow... -
Population growth of Daphnia magna cultured in manure-fertilised water under laboratory conditions
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Adamneh Dagne --- Ethiopian Institute of Agricultural Research (EIAR), National Fishery and other Aquatic Life Research Center, Ethiopia Getacher Beyene --- Ethiopian Institute of Agricultural Research (EIAR), National Fishery and other Aquatic Life Research Center, Ethiopia Alemayehu Wubie --- Ethiopian Institute of Agricultural Research (EIAR), National Fishery and other Aquatic Life Research Center, EthiopiaIn developing countries, mass production of Daphnia magna, used as a food in freshwater aquaculture, is a challenge. A fifteen-day laboratory experiment was conducted to examine the population growth and reproductive parameters for D. magna reared in green water fertilised... -
Pastures established on rehabilitated surface coal mined land: an assessment of forage production and implications for livestock grazing
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Emmanuel Nkosinathi Cele --- University of Pretoria, South Africa Monde Rapiya --- University of Pretoria, South Africa Wayne Sanders --- University of Pretoria, South Africa Wayne Truter --- Enterprises University of Pretoria, South AfricaCurrently, land rehabilitation best practice in South Africa is to revegetate ameliorated soil with grass mixtures. These grasses have valuable grazing potential that can deliver great benefits to livestock farmers. However, due to paucity of research and published findings, the... -
Impact of agroforestry tree canopies on soil properties and wheat (Triticum aestivum) yield in southern Ethiopia
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Daba Misgana Bekele --- Arba Minch University, Forestry Department, Ethiopia Tesfaye Hailemariam Hagos --- Arba Minch University, Forestry Department, Ethiopia Dereje Tsegaye Selfeko --- Arba Minch University, Plant Sciences Department, EthiopiaFarmers in southern Ethiopia integrate versatile trees with annual crops; yet, scientific data on their impacts on soil properties and crop yields remain limited. This research evaluated the impact of Croton macrostachyus (Hochst. Ex Delile) and Erythrina brucei (Schweinf) canopies... -
A reduced-parameter predator–prey model of soil formation from bedrock and biomass
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Animesh Samanta --- The Neotia University, India Priyanka Mandal --- The Neotia University, India Ayan Chatterjee --- The Neotia University, IndiaSoil–bedrock interaction on hillslopes is not well-studied, though it's affected by many physical and chemical factors. The aim of the present mathematical modelling study is to construct a model for soil formation utilising ordinary differential equations, all while reducing the... -
Growth potential and productivity of the green macroalgae Ulva reticulata in a sustainable farming system in a coastal lagoon at Bambous Virieux, Mauritius
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: N Nazurally --- Department of Agricultural and Food Science, University of Mauritius, Mauritius D Beehary-Panray --- Environmental Protection and Conservation Organisation (EPCO), Resilient Island Endeavour (RISE) Project, Mauritius EC Gatteschi --- Cooperazione Internazionale Sud Sud (CISS), Resilient Island Endeavour (RISE) Project, ItalyUlva reticulata is a fast-growing green macroalga with high bioremediation and economic potential. Cultivation of this seaweed at Bambous Virieux in southeast Mauritius was undertaken to evaluate its growth potential and biological feasibility in a tropical lagoon. Over a 30-day... -
Comparative growth and carotenoid production in the green microalga Dunaliella salina from marine and continental ecosystems: harnessing environmental diversity for sustainable industrial applications
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: S Benabouche --- Biotechnology Laboratory, Specialised Centre for Valorisation and Technology of Marine Products (CSVTPM), National Institute of Marine Research (INRH), Morocco M Chikhaoui --- Biotechnology Laboratory, Specialised Centre for Valorisation and Technology of Marine Products (CSVTPM), National Institute of Marine Research (INRH), Morocco H Baazizi --- Laboratory of Quality Control, Specialised Centre for Valorisation and Technology of Marine Products (CSVTPM), National Institute of Marine Research (INRH), Morocco F El Filali --- Laboratory of Quality Control, Specialised Centre for Valorisation and Technology of Marine Products (CSVTPM), National Institute of Marine Research (INRH), Morocco A Banaoui --- Laboratory of Aquatic Systems: Marine and Continental Environments (AQUAMAR), Faculty of Sciences, Ibn Zohr University, MoroccoIn Morocco, diverse saline ecosystems support both industrial salt production and the growth of Dunaliella salina, a halophilic unicellular green microalga in class Chlorophyceae, and well-known for its applications in aquaculture, cosmetics, food and pharmaceuticals owing to its significant carotenoid-producing...