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Influence of Soil Organic Matter Content on the Responsiveness of Eucalyptus grandis to Nitrogen Fertiliser
Item type: Journal Article • Journal: South African Forestry Journal • Authors: A.D. Noble --- Institute for Commercial Forestry Research, South Africa M.A. Herbert --- Institute for Commercial Forestry Research, South AfricaIt is widely recognised that the inherent nitrogen (N) mineralisation capacity of a soil is directly related to the organic matter content. Consequently, in estimating the N requirements of Eucalyptus grandis at planting this mineralisation potential must be taken into... -
Partitioning, storage and remobilization of 14C assimilated by Themeda triandra Forssk1
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: J.E. Danckwerts --- Department of Agriculture and Water Supply (Eastern Cape Region), Republic of South Africa A.J. Gordon --- , United KingdomThe second youngest fully‐expanded leaf on the main tiller of vegetative Themeda triandra plants was exposed to 14CO2. Thereafter, quantitative analysis of partitioning, storage and remobilization after defoliation of 14C‐labclled assimilate was conducted in serially‐harvested plants over a 27‐day period... -
The effect of reduced tillage on soil organic carbon
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: H. v. H. van der Watt --- Department of Soil Science, Republic of South AfricaThe organic carbon contents of the 0–15-cm and 15–30-cm layers of conventionally tilled, stubble-mulched and no-tilled soils were compared. Samples from four localities in the Transvaal and Orange Free State were analyzed for organic C by means of two methods... -
Changes in a Doveton clay loam after 12 years of direct-drill maize production
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J.B. Mallett --- , Republic of South Africa P.M. Lang --- , Republic of South Africa A.J. Arathoon --- , Republic of South AfricaAfter 8 years of direct-drill maize production at Cedara on a Hutton/Doveton clay loam (Typic Plinthustult) it was found that the top 120-mm layer had become somewhat denser and that organic carbon levels in the top 20 mm were higher... -
The effect of leaf water potential on the carbon-dioxide uptake rate during different growth stages of wheat (Triticum aestivum L.)
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: J.J. Human --- Department of Agronomy, Faculty of Agriculture, Republic of South Africa W.J. Roux --- Department of Agronomy, Faculty of Agriculture, Republic of South Africa L.P. de Bruyn --- Department of Agronomy, Faculty of Agriculture, Republic of South AfricaThe effect of water stress on the CO2 uptake rate was measured at three different growth stages of wheat grown in Mitscherlich pots in a glasshouse experiment. Stress was induced by withholding water until the leaf water potential reached −2... -
Die verwantskap tussen maksimum nitrifikasietempo en relevante eienskappe van gronde vanaf die sentrale besproeiingsgebiede in Suid-Afrika
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: D.J. Laubscher --- Departement van Grondkunde, Republiek van Suid-Afrika C.C. du Preez --- Departement van Grondkunde, Republiek van Suid-AfrikaDie oogmerk van die studie was om die verwantskappe tussen maksimum nitrifikasietempo (Kmaks) en relevante eienskappe van die gronde vanaf die sentrale besproeiingsgebiede uit te wys. Die verloop van nitrifikasie is in agt gronde, afkomstig van die gebiede, gemonitor na... -
Urease-aktiwiteite in gronde van die sentrale besproeiingsgebiede in Suid-Afrika
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: F. P.J. Thormählen --- Departement van Grondkunde, Republiek van Suid-Afrika C.C. du Preez --- Departement van Grondkunde, Republiek van Suid-AfrikaDie oogmerk met die studie was om die omvang van urease-aktiwiteite in die besproeide gronde vas te stel en watter grondparameters dit beïnvloed. Die verloop van hidrolise is in agt gronde, afkomstig van die sentrale besproeiingsgebiede, gemonitor na toediening van... -
Verwantskap tussen organiese materiaalinhoud van sekere onversteurde bogronde, grondeienskappe en klimaatsdata in Suid-Afrika
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: M.E. du Toit --- , Republiek van Suid-Afrika C.C. du Preez --- Departement van Grondkunde, Republiek van Suid-AfrikaDie doel met die ondersoek was om vas te stel of die organiese materiaalinhoud van onversteurde ortiese A-horisonte, wat deur rooi apedale, geelbruin apedale en sagte plintiese B-horisonte onderlê word, vanaf beskikbare of maklik meetbare grondeienskappe en klimaatsdata bereken kan... -
Nitrogen mineralization in selected soils from the maize producing areas of South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: GailA. van der Mey --- , Republic of South Africa H.M. Combrink --- , Republic of South Africa C.C. du Preez --- Department of Soil Science, Republic of South AfricaThe aim of this study was to relate nitrogen mineralization from soil to selected soil properties more easily obtained in the laboratory. Net nitrogen mineralization was determined to varying depths (0–200, 200–400 and 400–600 mm) in 21 soil profiles from... -
Effek van bewerking op die organiese materiaalinhoud van geselekteerde droëlandgronde in Suid-Afrika
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: M.E. du Toit --- , Republiek van Suid-Afrika C.C. du Preez --- Departement van Grondkunde, Republiek van Suid-Afrika M. Hensley --- , Republiek van Suid-Afrika A. T.P. Bennie --- Departement van Grondkunde, Republiek van Suid-AfrikaDie doel van die ondersoek was om (1) die effek van bewerking op die organiese materiaalinhoud van gronde te kwantifiseer indien onversteurde gronde as verwysing dien; (2) die verband tussen bewerkingstyd en die afname in organiese materiaal te kry en... -
Effek van bewerkingstyd op die afname van totale swawel in geselekteerde Suid-Afrikaanse gronde
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: M.C. du Toit --- , Republiek van Suid-Afrika C.C. du Preez --- Departement Grondkunde, Republiek van Suid-Afrika'n Afname van 4–70% in die totale S van bogronde as gevolg van bewerking het die vraag laat ontstaan hoe hierdie verlies verband hou met die periode van bewerking en of so 'n verwantskap tussen ekotope verskil. Bewerkte en nabygeleë... -
Fosfor in geselekteerde onversteurde en bewerkte Suid-Afrikaanse gronde 1. Totale, anorganiese en organiese fosfor
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A.J. van Zyl --- Departement Grondkunde, Republiek van Suid-Afrika C.C. du Preez --- Departement Grondkunde, Republiek van Suid-AfrikaMin is bekend oor die effek van boerderypraktyke soos bewerking, bemesting en bekalking op die fosforfraksies in gronde van die somerreënvalgebied (25°-30°S; 24°–30°O) in Suid-Afrika. Die doelstellings van die studie was om die effek van gewasverbouing op die totale (Pt),... -
Changes in the organic matter and nutrient contents of some South African irrigated soils
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: C.C. du Preez --- Department of Soil Science, Republic of South Africa G.H. Wiltshire --- Department of Soil Science, Republic of South AfricaCultivation caused, without exception, a decline in the organic matter content of dryland soils in the central regions of South Africa. The question arose as to how cultivation affects the organic matter content of irrigated soils from these regions. The... -
The measurement of low organic matter contents in soils
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: M.J. Rowell --- Agricultural Laboratory, Ministry of Agriculture, Water and Rural Development, Namibia M.E. Coetzee --- Agricultural Laboratory, Ministry of Agriculture, Water and Rural Development, NamibiaFour methods were compared to measure the small amounts of organic matter present in many Namibian soils and to detect organic amendments added to improve fertility. Two Walkley-Black wet oxidation methods involving titration (WBT-C) and colourimetry (WBC-C) and two loss... -
SOIL carbon and nitrogen in five contrasting biomes of South Africa exposed to different land uses
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A.J. Mills --- Department of Soil Science, South Africa M.V. Fey --- Department of Soil Science, South AfricaStocks of soil C to a depth of 50 cm in untransformed, indigenous veld ranged from 21 t ha-1 in karoo to 168 t ha-1 in thicket and stocks of N ranged from 3.41 ha-1 in karoo to 12.8 t... -
Ecosystem carbon storage under different land uses in three semi-arid shrublands and a mesic grassland in South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A.J. Mills --- Department of Soil Science, South Africa T.G. O'Connor --- Centre for African Ecology, South Africa J.S. Donaldson --- , South Africa M.V. Fey --- Department of Soil Science, South Africa A.L. Skowno --- , South Africa A.M. Sigwela --- Terrestrial Ecology Research Unit, Departments of Botany & Zoology, South Africa R.G. Lechmere-Oertel --- Terrestrial Ecology Research Unit, Departments of Botany & Zoology, South Africa J.D. Bosenberg --- , South AfricaCarbon (C) storage in biomass and soils is a function of climate, vegetation type, soil type and land management. Carbon storage was examined in intact indigenous vegetation and under different land uses in thicket (250–400 mm mean annual precipitation), xeric... -
Plant nutrient status of soils of the Lusikisiki area, Eastern Cape Province
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: C. Bühmann --- , D.J. Beukes --- , D.P. Turner --- ,The aim of the paper is to Identify major soil plant fertility constraints for 15 soil profiles from the Lusikisiki area of the Eastern Cape Province of South Africa. Phosphorus levels were very low, with 87% of the A horizons... -
Influence of long-term wheat residue management on organic matter in an Avalon soil
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: E. Kotzé --- Department of Soil, Crop and Climate Sciences, Republic of South Africa C.C. du Preez --- Department of Soil, Crop and Climate Sciences, Republic of South AfricaThis study was initiated to determine the influence of different wheat residue management practices, that were sustained for about 20 years, on the organic matter content of an Avalon soil in a long-term trial near Bethlehem in the Eastern Free... -
Physiological traits associated with drought tolerance in bread wheat (Triticum aestivum L.) under tropical conditions
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: P.K. Kimurto --- Department of Crop and Soil Sciences, Kenya J.B.O. Ogola --- Department of Plant Production, South Africa M.G. Kinyua --- Department of Crop Science and Biotechnology, Kenya J.M. Macharia --- Department of Botany, Kenya P.N. Njau --- , KenyaAlthough it is generally accepted that drought tolerance is a critical agronomic trait, efficient and predictable improvement in drought tolerance in bread wheat (Triticum aestivum L.), in varying drought stress conditions, has not been fully achieved. This study aimed at... -
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... -
Characterisation of alkaline tailings from a lead/zinc mine in South Africa and evaluation of their revegetation potential using five indigenous grass species
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: LouisW Titshall --- School of Agriculture, Earth and Environmental Sciences, South Africa JeffreyC Hughes --- School of Agriculture, Earth and Environmental Sciences, South Africa H Christopher Bester --- School of Agriculture, Earth and Environmental Sciences, South AfricaTailings from a lead/zinc (Pb/Zn) mine were characterised and their revegetation potential investigated under glasshouse conditions using five grass species with three rates of inorganic fertiliser. The tailings were alkaline with low nutrient concentrations but high total and extractable Zn... -
VALUES FOR THE FIRST AND SECOND APPARENT DISSOCIATION CONSTANTS, K'1 & K'2 OF CARBONIC ACID FOR ESTUARINE AND BRACKISH WATERS AS A FUNCTION OF TEMPERATURE AND CHLORINITY
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: B.R. Allanson --- Institute for Freshwater Studies, Department of Zoology and Entomology, Republic of South Africa C. Duncombe Rae --- Institute for Freshwater Studies, Department of Zoology and Entomology, Republic of South Africa -
NUTRIENT CYCLING IN MARINE ECOSYSTEMS
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: P. Chapman --- , South AfricaThe overall cycles of nitrogen, phosphorus and silicon in the sea are described and compared. Data on the fluxes and rates of change between various pools of each nutrient are given, where available, and gaps in knowledge are pointed out... -
DECOMPOSITION IN PELAGIC MARINE ECOSYSTEMS
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: M.I. Lucas --- Zoology Department, South AfricaDuring the decomposition of plant detritus, complex microbial successions develop which are dominated in the early stages by a number of distinct bacterial morphotypes. The microheterotrophic community rapidly becomes heterogenous and may include cyanobacteria, fungi, yeasts and bactivorous protozoans. -
FLUX OF INORGANIC NUTRIENTS AND PARTICULATE CARBON BETWEEN A SPARTINA MARITIMA SALT MARSH AND THE SWARTKOPS ESTUARY, EASTERN CAPE
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: D. Baird --- Department of Zoology, South Africa P. E.D. Winter --- Department of Zoology, South AfricaThe flux of dissolved inorganic nutrients (NH4-N, NO2-N, NO3-N, SRP) and suspended particulates (particulate organic carbon POC, and particulate inorganic carbon PIC) was measured across the mouth of a small creek draining a portion of the intertidal Spartina salt marsh... -
CHANGES IN THE BENTHIC FAUNA OF LAKE CHIVERO, ZIMBABWE, OVER THIRTY YEARS
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: B.E. Marshall --- Department of Biological Sciences, ZimbabweLake Chivero is a eutrophic Zimbabwean reservoir and data on its benthic fauna are available over a period of about thirty years. The levels of organic carbon are higher than in many other southern African reservoirs but have not increased... -
Effect of three grazing intensities on selected soil properties in semi‐arid west Texas
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: E.M. Seitlheko --- Department of Agronomy, United States of America B.L. Allen --- Department of Agronomy, United States of America D.B. Wester --- Department of Agronomy, United States of AmericaSoils in the study, carried out in the Texas Trans‐Pecos region, were fine‐loamy, mixed, thermic Aridic Calciustolls; fine‐loamy, mixed, thermic Aridic Ustochrepts; and fine, mixed, thermic Typic Chromusterts. Our primary objective was to determine the effect of three grazing intensities... -
The distribution of sweetveld and sourveld in South Africa's grassland biome in relation to environmental factors
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: W.N. Ellery --- Department of Geographical and Environmental Sciences, Republic of South Africa R.J. Scholes --- CSIR, Republic of South Africa M.C. Scholes --- Centre for African Ecology, Department of Botany, Republic of South AfricaThe distribution of sweet‐ and sourveld in relation to climate, parent material and soil nutrients has been examined in South Africa's grassland biome. Sourveld occurs in areas with high water supply and where parent material gives rise to soils with... -
Detecting the onset of rangeland degradation using soil respiration and boundary lines: preliminary findings from the Nama Karoo
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: A Mills --- Department of Soil Science, South Africa M Fey --- School of Earth and Environment, Australia B Kgope --- , South Africa J Donaldson --- , South Africa J de W Bosenberg --- , South AfricaMean annual soil respiration correlates with net primary productivity and therefore provides an indication of ecosystem functioning. Soil respiration, however, varies considerably in space and time owing to the influence of factors such as soil nutrient content, temperature and water... -
Climate change perceptions, drought responses and views on carbon farming amongst commercial livestock and game farmers in the semiarid Great Fish River Valley, Eastern Cape province, South Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: CL Clarke --- Department of Environmental Science, South Africa SE Shackleton --- Department of Environmental Science, South Africa M Powell --- Department of Environmental Science, South AfricaThere is increasing evidence that climate change will be one of the primary challenges facing future development and agriculture. Farmers, whether crop or livestock farmers, will be faced with tradeoffs and constraints as climate change exposes them to greater risk... -
Water use efficiency in South African Eucalyptus plantations: A review
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: PeterJ. Dye --- Faculty of Science and Agriculture,The relation between rainfall and Eucalyptus stem growth is investigated using data recorded at three ICFR espacement trials in kwaZulu-Natal. These data show that, for a given rainfall amount, large differences in stem growth may occur at different sites. The... -
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... -
Biomagnification of mercury in fish from Thruston Bay, Napoleon Gulf, Lake Victoria (East Africa)
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: LindaM Campbell JS Balirwa DG Dixon RE HeckyTotal mercury concentrations (THg) were measured in fish from Thruston Bay, Napoleon Gulf in northern Lake Victoria between 1998 and 2000. Total Hg concentrations in Lates niloticus (Nile perch) and Oreochromis niloticus (Nile tilapia) ranged from 10.6 to 77.5ng g–1... -
The primary carbon sources utilised by fishes in the Mngazi and Mngazana estuaries, South Africa: a preliminary assessment
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Sekiwe Mbande William Froneman AlanK WhitfieldA number of studies have used stable carbon isotopes to analyse aspects of the food web structure in South African estuaries but none has compared mangrove and non-mangrove estuarine food webs. This study compares the primary carbon sources utilised by... -
Nature of suspended particulate matter and concentrations of heavy metals in sediment in the southern part of Lake Victoria, East Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: JF Machiwa --- Department of Aquatic Environment and Conservation, TanzaniaThe concentrations of metals in bottom sediment in the Tanzanian waters of Lake Victoria and the nature of suspended particulate matter (SPM) were analysed. The objective of the study was to compare levels of metals in sediment from different locations... -
Flood effects on trophic linkages of selected fish species in the littoral zone of the St Lucia estuarine system, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: N Peer --- School of Life Sciences, South Africa NK Carrasco --- School of Life Sciences, South Africa R Perissinotto --- School of Life Sciences, South Africa SJ du Plooy --- School of Life Sciences, South AfricaThe St Lucia Estuary, a UNESCO World Heritage Site, has experienced prolonged mouth closure since 2002. Until recently it was hypersaline, but heavy rainfall between October 2010 and January 2011 led to a large overall decrease in salinity. A stable... -
A Review of the Dendrochronology and Radiocarbon Calibration Relationship
Item type: Journal Article • Journal: South African Forestry Journal • Authors: R.N. Thwaites --- Saasveld Forestry Research Centre,The history of dendrochronology is traced from the discovery of the method to prove astronomic sun-spot cycles to its use in archaeology for dating purposes. The principles and problems of both dendrochronology and radiocarbon 14C dating are described and the... -
Uptake and accumulation of ammonium by Alexandrium catenella during nutrient pulses
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: Y Collos M Lespilette A Vaquer M Laabir A PastoureaudField observations in Thau Lagoon, southern France, indicate that the growth of natural populations of Alexandrium catenella during blooms is limited by nitrogen and exhibits a storage rather than a growth response to an ammonium pulse. Therefore, ammonium uptake and... -
Contribution by microbes to the foodweb of a mangrove biotope: the approach of carbon and nitrogen stable isotopes
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: MA Nabeel --- , India K Kathiresan --- , India N Rajendran --- , India H Ohnishi --- , Japan H Hamaoka --- , Japan K Omori --- , JapanThe contribution of mangroves as a source of nutrients to the foodweb of fish is under debate worldwide. An analysis of stable isotopes of carbon and nitrogen in various consumers and producers of a mangrove biotope in southern India revealed... -
Thermal constraints on the respiration and excretion rates of krill, Euphausia hanseni and Nematoscelis megalops, in the northern Benguela upwelling system off Namibia
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: T Werner --- , Germany K Huenerlage --- , Germany H Verheye --- Oceans and Coasts, Department of Environmental Affairs, South Africa F Buchholz --- , GermanyRates of respiration and ammonia excretion of Euphausia hanseni and Nematoscelis megalops were determined experimentally at four temperatures representative of conditions encountered by these euphausiid species in the northern Benguela upwelling environment. The respiration rate increased from 7.7 µmol O2... -
Diversity and coverage of seagrass ecosystems in south-west Madagascar
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: JMO Hantanirina --- , UK S Benbow --- , UKSeagrass meadows provide important nursery and feeding grounds for many commercially valuable fish species. Here, we address the paucity of published information on the status of seagrasses in Madagascar by documenting the results from ecological surveys of 11 seagrass beds... -
A Conceptual Framework for Implementing Sustainable Livelihoods and Innovation in Biofuel Production among Smallholder Farmers
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Chipo Nyamwena-Mukonza --- , South AfricaThere has been renewed interest in biofuel production globally as a response to the continuous increase in oil prices, the depletion of fossil fuels and as nations move towards a low carbon economy. The paper is a work in progress... -
Effects of Refrigerant Charge in the Output of a CO2 Heat Pump
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Paul Maina --- Department of Mechanical Engineering, South Africa Zhongjie Huan --- Department of Mechanical Engineering, South AfricaMany of the refrigerants currently being used in heating, ventilation, air conditioning and refrigeration systems have high global warming potential. One potential, environmentally friendly replacement refrigerant is carbon dioxide (CO2). In this study, a CO2 trans-critical water to water test... -
Site and stand analysis for growth prediction of Eucalyptus grandis on the Zululand coastal plain
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: M. du Plessis --- , J Zwolinski --- ,The integration of site information with that of tree growth is of special importance in Zululand, where sustainable supply of timber is essential for local processing and export commitments. Site prediction growth models need to be based on easily attainable... -
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... -
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... -
Mangrove litter production and organic carbon pools in the Mngazana Estuary, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Anusha Rajkaran JanineB AdamsWood harvesting is reducing the density of adult mangrove trees in the Mngazana Estuary. This is expected to decrease the amount of litter produced as well as the availability of organic carbon to the estuary and the nearshore environment. Pools... -
Evidence of carbon transport between shelf and slope waters in the Benguela upwelling system
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: S Swart HN Waldron L HutchingsThe world ocean is pivotal in the global carbon cycle and, subsequent to anthropogenic loading of the atmosphere with CO2, its ability to sequestrate photosynthetically-fixed carbon is important with respect to our ability to predict climate change. A study of... -
Cross-shelf biogeochemical characteristics of sediments in the central Benguela and their relationship to overlying water column hypoxia
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: AK van der Plas PMS Monteiro A PascallData from two cross-shelf sediment sampling cruises were used to explain reasons for the sediment biogeochemical variability in respect of carbon, nitrogen and sulphur, and how the cycling of these elements governs the biogeochemistry of the overlying water through their... -
Inducible defences in Acacia sieberiana in response to giraffe browsing
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: AD Zinn D Ward K KirkmanAcacia trees comprise a principal component of the diet of many African browsers. The resultant browsing pressure has led to the evolution of both physical and chemical responses in Acacia trees. In an observational study, we investigated the physical and... -
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... -
Energy, chemicals and carbon: future options for the Eucalyptus value chain
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: S ChristieThis paper examines the current Eucalyptus value chain and the possible drivers that may impact upon it. The potential consequences of climate change on the growth and yield of Eucalyptus are discussed and the impact of the security of oil... -
Why don't our stands grow even faster? Control of production and carbon cycling in eucalypt plantations
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: MG Ryan D Binkley JL StapeThe growth of Eucalyptus stands varies several fold across sites, under the influence of resource availability, stand age and stand structure. We describe a series of related studies that aim to understand the mechanisms that drive this great range in... -
Knowledge and attitude of Nigerian personnel working at Federal Medical Centre in Nigeria on carbon monoxide poisoning from electrical power generators
Item type: Journal Article • Journal: South African Family Practice • Authors: Jide Afolayan --- Department of Anaesthesia, Nigeria Tokunbo Olajumoke --- Department of Anaesthesia, Nigeria Federick Amadasun --- Department of Anaesthesia, Nigeria Theodore Isesele --- Department of Anaesthesia, NigeriaBackground: Private portable electrical power generators are common household items in Nigeria owing to inadequate electrical power provision for the public. These engines often run indoors, emitting poisonous carbon monoxide gas. Fatalities are commonly reported as a result of carbon... -
Microclimate conditions in ventilated wet-walled greenhouses in a subtropical climate: spatial variability
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Michael J Savage --- Agrometeorology Discipline, Soil-Plant-Atmosphere Continuum Research Unit, School of Agricultural, Earth and Environmental Sciences, South AfricaSpatial variations of microclimatic conditions in enclosed north–south (N–S) oriented single-arched greenhouse polycarbonate structures, with a wet-wall providing evaporative cooling at the S end, were investigated and displayed online in near real-time. Temperature-controlled fans at the N end extracted air... -
Trophic investigations of Cape fur seals at the easternmost extreme of their distribution
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: M Connan --- Department of Zoology, South Africa GJG Hofmeyr --- Department of Zoology, South Africa MJ Smale --- Department of Zoology, South Africa PA Pistorius --- Department of Zoology, South AfricaThe diet of Cape fur seals Arctocephalus pusillus pusillus in the eastern portion of their distribution has received little attention previously, and was studied using traditional methods only. In 2013 we therefore assessed the diet of seals at the easternmost... -
Can δ15N and δ13C stable isotopes and fatty acid signatures indicate changes in phytobenthos composition on an artificial substrate?
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: T Dalu --- Department of Zoology and Entomology, South Africa PW Froneman --- Department of Zoology and Entomology, South AfricaTemporal changes in fatty acid composition and δ15N, δ13C stable isotope values of the phytobenthos growing on artificial clay substrates under natural conditions over a 28-day period at an upstream and a downstream site in the Kowie River near Grahamstown... -
Soil organic carbon and nitrogen stocks along a seasonal wetland (dambo) transect in central Zimbabwe
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: George Nyamadzawo --- Department of Soil Science and Agricultural Engineering, Zimbabwe Menas Wuta --- Department of Soil Science and Agricultural Engineering, Zimbabwe Justice Nyamangara --- International Crops Research Institute for the Semi Arid Tropics, Matopos Research Station, Zimbabwe Philip Nyamugafata --- Department of Soil Science and Agricultural Engineering, ZimbabweEcosystems of central and southern Africa are occupied by some of the largest seasonal wetlands commonly called dambos. Dambos are likely to store huge stocks of soil organic carbon (SOC) because of their saturated conditions. However, most available literature report... -
Improving productivity and sustainability of successive rotations of Acacia auriculiformis plantations in South Vietnam
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Vu Dinh Huong --- Forest Science Institute of South Vietnam, Vietnam EK Sadanandan Nambiar --- CSIRO Land and Water Flagship, Australia Le Thanh Quang --- Forest Science Institute of South Vietnam, Vietnam Daniel S Mendham --- CSIRO Land and Water Flagship, Australia Pham The Dung --- Forest Science Institute of South Vietnam, VietnamWe studied the productivity of Acacia auriculiformis plantations in South Vietnam over three successive rotations covering 15 years. The focus of our study was on the effects of inter-rotation management on stand growth and soil properties. Contrastin g slash and... -
Evaluation of the levels of reactive di-carbonyl compounds and polyaromatic hydrocarbons in processed Atlantic horse mackerel (Trachurus trachurus)
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: O.T. Adeyemi --- Department of Biochemistry, Bencarson Senior School of Medicine, Nigeria O. Osilesi --- Department of Biochemistry, Bencarson Senior School of Medicine, Nigeria O.O. Adebawo --- Department of Biochemistry, Bencarson Senior School of Medicine, Nigeria F.D. Onajobi --- Department of Biochemistry, Bencarson Senior School of Medicine, Nigeria S.O. Oyedemi --- Botany Department, South Africa A.J. Afolayan --- Botany Department, South AfricaTrachurus trachurus (locally called kote in Western Nigeria) is a table fish. During processing like poaching and smoking, fish come in contact with water, smoke and high temperatures, which may interfere with the nutrient contents and are potential sources of... -
A review of renal protection strategies
Item type: Journal Article • Journal: Southern African Journal of Anaesthesia and Analgesia • Authors: Erna Meyer --- Northland District Health Board, Whangarei Base Hospital, New ZealandGlobally, more than 10 million people are affected every year by acute kidney injury (AKI) and approximately 6% of hospital patients sustain some degree of kidney injury during their hospital event. Reducing perioperative kidney injury may significantly improve patient outcomes... -
Incorporating stable isotopes into a multidisciplinary framework to improve data inference and their conservation and management application
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: HM Christiansen --- Great Lakes Institute for Environmental Research, Canada AT Fisk --- Great Lakes Institute for Environmental Research, Canada NE Hussey --- Great Lakes Institute for Environmental Research, CanadaThrough its ability to address complex ecological questions and the possibility of analysing large sample sizes to understand population‑level processes, the use of stable isotope analysis (δ13C and δ15N) has grown rapidly in recent years. Importantly, it is now becoming... -
A new species of Heterixalus (Amphibia: Hyperoliidae) from western Madagascar
Item type: Journal Article • Journal: African Zoology • Authors: Miguel Vences --- Zoologisches Forschungsinstitut und Museum A. Koenig, Germany Frank Glaw --- Acquario di Genova, Italy Riccardo Jesu --- Acquario di Genova, Area Porto Antico, Italy Giovanni Schimmenti --- Acquario di Genova, Area Porto Antico, ItalyA new species of hyperoliid frog, Heterixalus carbonei n.sp., is described from the Antsingy forest inwestern Madagascar. It is characterized by an advertisement call consisting of long and regular note series. The only other Heterixalus with a similar call structure,... -
Assessing the potential benefits of organic and mineral fertiliser combinations on legume productivity under smallholder management in Zimbabwe
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Grace Kanonge --- Chemistry and Soils Research Institute, Zimbabwe Florence Mtambanengwe --- Soil Fertility Consortium for Southern Africa (SOFECSA), Department of Soil Science and Agricultural Engineering, Zimbabwe Muneta G Manzeke --- Soil Fertility Consortium for Southern Africa (SOFECSA), Department of Soil Science and Agricultural Engineering, Zimbabwe Hatirarami Nezomba --- Soil Fertility Consortium for Southern Africa (SOFECSA), Department of Soil Science and Agricultural Engineering, Zimbabwe Paul Mapfumo --- Soil Fertility Consortium for Southern Africa (SOFECSA), Department of Soil Science and Agricultural Engineering, ZimbabweProductivity of grain legumes on sandy soils of southern Africa is critically limited by marginal fertilisation. Effects of co-applying phosphorus (P)-based mineral fertilisers and organic nutrient resources to cowpea (Vigna unguiculata (L.) Walp.) and soyabean (Glycine max L.) were investigated... -
Mangrove reforestation: greening or grabbing coastal zones and deltas? Case studies in Senegal
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: MC Cormier-Salem --- IRD, UMR PALOC, Senegal J Panfili --- IRD, UMR MARBEC, FranceBesides their important contribution to global biodiversity, mangroves provide many services. Nevertheless, due to an increase of human activities and to climate change, in less than 20 years these ecosystems have lost one fifth of their global surface area. In... -
Soil carbon dioxide effluxes from different vegetation environments in semi-arid Eastern Cape, South Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Rebecca Zengeni --- Soil Sciences Department, South Africa Vincent Kakembo --- Department of Geosciences, South Africa Nsalambi Nkongolo --- Centre of Excellence for Geospatial Information Science, USAThough important, CO2 effluxes from non-agricultural ecosystems are poorly characterised. Given that thicket vegetation is prevalent in Eastern Cape, South Africa, we monitored soil CO2 effluxes from an intact thicket, degraded thicket (DT) and grassland (G) over 10 months, as... -
The economics of the carbon sequestration potential of plantation forestry in south-western Uganda
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Isaac Kiyingi --- National Forestry Resources Research Institute, Uganda Abdi-Khalil Edriss --- Department of Agricultural and Applied Economics, Faculty of Development Studies, Malawi Alexander MR Phiri --- Department of Agricultural and Applied Economics, Faculty of Development Studies, Malawi Buyinza Mukadasi --- School of Postgraduate Studies, Uganda Susan Tumwebaze --- School of Forestry, Environment and Geographical Sciences, Uganda Hillary Agaba --- National Forestry Resources Research Institute, UgandaThis study assessed the amount of carbon stored and the economic viability of the small-scale Clean Development Mechanism (CDM) carbon offsets in Pinus caribaea and Eucalyptus grandis plantations under varying rotations. Volume equations were used to estimate carbon stocks and... -
Riverine influence determines nearshore heterogeneity of nutrient (C, N, P) content and stoichiometry in the KwaZulu-Natal Bight, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: UM Scharler --- School of Life Sciences, South Africa MJ Ayers --- School of Life Sciences, South Africa AM de Lecea --- School of Life Sciences, South Africa M Pretorius --- Department of Biodiversity and Conservation Biology, South Africa ST Fennessy --- Oceanographic Research Institute, South Africa JA Huggett --- Branch: Oceans and Coasts, Department of Environmental Affairs, South Africa CF MacKay --- Oceanographic Research Institute, South Africa D Muir --- Medgar Evers College, USARiverine influences on nearshore oceanic habitats often have detrimental consequences leading to algal blooms and hypoxia. In oligo- to mesotrophic systems, however, nutrient delivery via rivers may stimulate production and even be a vital source of nutrients, as may nutrient... -
“You are not always what you eat”: diet did not override intrinsic nestmate recognition cues in Argentine ants from two supercolonies in South Africa
Item type: Journal Article • Journal: African Zoology • Authors: Natasha P Mothapo --- DST-NRF Centre of Excellence for Invasion Biology, Department of Botany and Zoology, South Africa Theresa C Wossler --- DST-NRF Centre of Excellence for Invasion Biology, Department of Botany and Zoology, South AfricaNestmate recognition in ants is based on cuticular hydrocarbons (CHCs), which are heritable and may also be acquired from the environment (i.e. diet and nest environment). In Argentine ants (Linepithema humile), diet and a homogenous environment have been shown to... -
Effect of integrated soil bunds on key soil properties and soil carbon stock in semi-arid areas of northern Ethiopia
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Birhane Tadesse --- Natural Resource Management, Bureau of Agriculture and Rural Development, Ethiopia Shimbahri Mesfin --- Department of Land Resource Management and Environmental Protection, Ethiopia Girmay Tesfay --- Department of Natural Resource Economics and Management, Ethiopia Fetien Abay --- Department of Dryland Crop and Horticultural Science, EthiopiaLand degradation is a serious global problem. To reclaim degraded land, many soil bunds have been implemented. However, their effectiveness has not been studied in all regions of Ethiopia. The objective of this study was to investigate the effect of... -
Variations on soil carbon dioxide flux with land-use type and selected soil properties in the hardveld of Botswana
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Oagile Dikinya --- Department of Environmental Science, Botswana Julius Atlhopheng --- Department of Environmental Science, Botswana Trust Manyiwa --- Department of Environmental Science, BotswanaThe dynamics of carbon dioxide (CO2) flux in the hardveld regions of Botswana are poorly understood, with previous studies having concentrated on sandveld and pan environments. In particular, soil organic carbon (SOC) has a positive influence on CO2 emissions to... -
Tillage and crop rotation effects on carbon sequestration and aggregate stability in two contrasting soils at the Zanyokwe Irrigation Scheme, Eastern Cape province, South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Arnold N Njaimwe --- Department of Agronomy, Faculty of Science and Agriculture, South Africa Pearson NS Mnkeni --- Department of Agronomy, Faculty of Science and Agriculture, South Africa Cornelius Chiduza --- Department of Agronomy, Faculty of Science and Agriculture, South Africa Pardon Muchaonyerwa --- School of Agricultural, Earth and Environmental Sciences, South Africa Isaiah IC Wakindiki --- Department of Agronomy, Faculty of Science and Agriculture, South AfricaIntensive tillage and monocropping have adversely affected the quality of soils in South Africa through accelerated loss of soil organic matter. Two clay loam soils, a Bonheim at Burnshill and a Shortlands at Lenye, at the Zanyokwe Irrigation Scheme in... -
Contribution of forest floor fractions to carbon storage and abundance patterns of arbuscular mycorrhizal fungal colonisation in a tropical montane forest
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: V Jeyanny --- Forest Plantation Programme, Malaysia MH Ahmad Husni --- Faculty of Agriculture, Malaysia B Siva Kumar --- Faculty of Agriculture, Malaysia K Wan Rasidah --- Forest Plantation Programme, Malaysia WC Suhaimi --- Forest Plantation Programme, MalaysiaForest floor carbon stocks, which include different components of litter, hemic and sapric materials, have not been empirically quantified in tropical montane forest, although they influence soil carbon (C) pools. To date, the contribution of arbuscular mycorrhizae in C sequestration... -
Nutrient limitation in two marine diatoms inhibits release of bromoform
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: M Nguvava --- Department of Oceanography, South Africa B Kuyper --- Department of Oceanography, South Africa E Bucciarelli --- Department of Oceanography, South Africa H Waldron --- Department of Oceanography, South Africa C Palmer --- Applied Centre for Climate and Earth Systems Science, CSIR, South AfricaBromoform released from phytoplankton and kelp in the ocean is the largest known carrier of bromine to the atmosphere. The photoproducts of atmospheric bromoform catalyse ozone depletion. Laboratory investigations were conducted into the link between nutrient limitation and bromoform production... -
The effects of conservation tillage practices and fertiliser management on soil structural properties at an experimental farm
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Danie Beukes --- Agricultural Research Council–Institute for Soil, Climate and Water, South Africa Corrie Swanepoel --- Agricultural Research Council–Institute for Soil, Climate and Water, South AfricaCrop rotation and reduced tillage under conservation agriculture (CA) practices may induce higher soil organic carbon (SOC) and nitrogen (N) levels compared with conventional (Con) tillage practices. Soil organic carbon may increase soil aggregate stability (AS). The study site was... -
Improved usefulness of continental soil databases for agricultural management through local adaptation
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Mats Söderström --- International Center for Tropical Agriculture (CIAT), Kenya Kristin Piikki --- International Center for Tropical Agriculture (CIAT), Kenya Jeremy Cordingley --- Crop Nutrition Laboratory Services Ltd, KenyaThe usefulness of a continental digital soil map (AfSoilGrids250) was investigated at two levels relevant for agricultural fertiliser recommendations in Rwanda (point locations and administrative sector unit averages). Analysis of 900 soil samples for pH and soil organic carbon (SOC)... -
Comparison of soil properties under tropical Acacia hybrid plantation and shifting cultivation land use in northern Vietnam
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Trieu Thai Hung --- Tasmanian Institute of Agriculture and School of Land and Food, Australia Richard Doyle --- Tasmanian Institute of Agriculture and School of Land and Food, Australia Alieta Eyles --- Tasmanian Institute of Agriculture and School of Land and Food, Australia Caroline Mohammed --- Tasmanian Institute of Agriculture and School of Land and Food, AustraliaDespite the common use of Acacia species in Vietnam, few studies have examined changes to total soil nitrogen (TN) and total soil carbon (TC) following the planting of Acacia mangium × Acacia auriculiformis (Acacia hybrid) plantations (AH) on formerly eroded... -
Growing common plantation tree species in Kenya for sale of carbon and wood supply: what is the best bet?
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Vincent Oeba --- African Forest Forum, c/o World Agroforestry Centre (ICRAF), Kenya Larwanou Mahamane --- African Forest Forum, c/o World Agroforestry Centre (ICRAF), Kenya Samuel CJ Otor --- Department of Environmental Sciences, School of Environmental Studies, Kenya James B Kung’u --- Department of Environmental Sciences, School of Environmental Studies, Kenya Muchiri N Mbae --- Kenya Forestry Research Institute, KenyaThe introduction of carbon finance as an incentive in forestry farming has a potential of increasing the amount of carbon sequestered. However, this has created a daunting task among investors in forestry to optimise the joint production of wood and... -
A review of carbon dynamics and assessment methods in the miombo woodlands
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Ferdinand Handavu --- Forest Science Postgraduate Programme, Department of Plant and Soil Sciences, South Africa Paxie W Chirwa --- Forest Science Postgraduate Programme, Department of Plant and Soil Sciences, South Africa Stephen Syampungani --- Department of Environmental and Plant Sciences, Zambia Larwanou Mahamane --- African Forest Forum, c/o World Agroforestry Centre (ICRAF), KenyaProvision of accurate carbon (C) measurements and analysis are critical components in quantification of C stocks. The objectives of this review were to (1) compile and synthesise current knowledge of available methods for C stock estimation, (2) examine socio-economic drivers... -
Organic carbon associated with tillage-induced aggregates of some quartz-dominated loamy soils in a semi-arid region of South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Isaiah IC Wakindiki --- School of Agriculture, South Africa Sarah K Njeru --- Department of Agronomy, South AfricaTillage breaks down soil aggregates exposing the associated organic matter to increased degradation. The extent of degradation depends on the soil properties, mainly texture and mineralogy. The objective of this study was to determine the amount of soil organic carbon... -
Improvement of spatial modelling of crop suitability using a new digital soil map of Tanzania
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Kristin Piikki --- International Center for Tropical Agriculture (CIAT), Kenya Leigh Winowiecki --- World Agroforestry Centre (ICRAF), Kenya Tor-Gunnar Vågen --- World Agroforestry Centre (ICRAF), Kenya Julian Ramirez-Villegas --- International Center for Tropical Agriculture (CIAT), Colombia Mats Söderström --- International Center for Tropical Agriculture (CIAT), KenyaClimate change is projected to have widespread impacts on the climate suitability and geographical distribution of agricultural crops. Simulations were conducted on the suitability of common beans (Phaseolus vulgaris L.) in Tanzania under progressive climate change, taking into account a... -
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... -
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... -
Terrestrial discharge influences microbioerosion and microbioeroder community structure in coral reefs
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: SA Mwachireya --- Kenya Marine and Fisheries Research Institute (KMFRI), Kenya M Carreiro-Silva --- Department of Oceanography and Fisheries (IMAR network), Portugal BE Hartwick --- Department of Biological Sciences, Canada TR McClanahan --- Wildlife Conservation Society, Marine Programs, USAMicrobioerosion rates and microbioeroder community structure were studied in four Kenyan protected coral-reef lagoons using shell fragments of Tridacna giant clams to determine their response to the influence of terrestrial run-off. Fourteen different microbioeroder traces from seven cyanobacteria, three green... -
Dissimilar stem and leaf hydraulic traits suggest varying drought tolerance among co-occurring Eucalyptus grandis × E. urophylla clones
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Casparus J Crous --- Department of Plant and Soil Sciences, South Africa Izette Greyling --- Department of Microbiology and Plant Pathology, South Africa Michael J Wingfield --- Department of Plant and Soil Sciences, South AfricaIn South Africa, there is currently a phenomenon where a Eucalyptus grandis × E. urophylla clone is dying on a large scale, whereas co-occurring clones in the same plantation area remain healthy. No primary biotic pathogen has been isolated from... -
Carbon stocks and productivity of mangrove forests in Tanzania
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Marco A Njana --- National Carbon Monitoring Centre, Tanzania Eliakimu Zahabu --- National Carbon Monitoring Centre, Tanzania Rogers E Malimbwi --- Department of Forest Mensuration and Management, TanzaniaMangroves offer a number of ecosystem goods and services, including carbon (C) storage. As a carbon pool, mangroves could be a source of CO2 emissions as a result of human activities such as deforestation and forest degradation. Conversely, mangroves may... -
Effect of residue and fertiliser management on soil fertility in a long-term sugarcane trial in South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Sandile Mthimkhulu --- South African Sugarcane Research Institute, South Africa Neil Miles --- South African Sugarcane Research Institute, South Africa Rianto van Antwerpen --- South African Sugarcane Research Institute, South Africa Dimpho Elephant --- South African Sugarcane Research Institute, South AfricaUnderstanding the impact of long-term continuous addition of sugarcane residues and fertiliser on soil fertility is important for development of best management practices. The experiment commenced in 1939. The fertility of the 0–10 cm soil layer was affected by the... -
Wintertime rates of net primary production and nitrate and ammonium uptake in the southern Benguela upwelling system
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: RF Flynn --- Department of Oceanography, South Africa JM Burger --- Department of Oceanography, South Africa K Pillay --- Branch: Oceans and Coasts, Department of Environmental Affairs (DEA), South Africa SE Fawcett --- Department of Oceanography, South AfricaThe elevated levels of primary productivity associated with eastern boundary currents are driven by nutrient- rich waters upwelled from depth, such that these regions are typically characterised by high rates of nitrate-fuelled phytoplankton growth. Production studies from the southern Benguela... -
Descriptive analysis of building indigenous low-carbon innovation capability in Nigeria
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Yusuf Opeyemi Akinwale --- School of Economics, Faculty of Economic Sciences and IT, South AfricaThe issue of a low-carbon energy system is contentious especially in developing countries as the world is transiting from a fossil fuel based economy to a low-carbon economy. A new development path of low-carbon energy is being sought so as... -
Socio-economic and environmental analysis of wind power projects as viable renewable energy resources in Kenya
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Victor Ongoma --- Key Laboratory of Meteorological Disaster, Ministry of Education (KLME)/Joint International Research Laboratory of Climate and Environment Change (ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC-FEMD), People’s Republic of ChinaThe demand for power in Kenya is on the increase with the ongoing growth of the country’s economy. There is a need for the country to balance energy efficiency, sustainability and low-carbon technologies. This entails drafting and implementing policies and... -
Mapping dynamics of low-carbon energy innovation for small hydropower technology in Nigeria
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Maruf Sanni --- National Centre for Technology Development, Federal Ministry of Science and Technology, NigeriaThe urgent need for clean innovative energy systems is widely recognized amidst increasing concerns over energy insecurity, climate change and other environmental impacts of a carbon-constrained economy. Several renewable energy technologies such as small hydropower (SHP) are poised to play... -
Building low-carbon energy innovation systems in Africa
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Radhika Perrot --- Independent researcher, South Africa Maruf Sanni --- National Centre for Technology Management, NigeriaThe objective of this special issue is to bring together research on low-carbon innovation in the African context. The aim is to assess and compare various cases of low-carbon energy development in Africa in an effort to understand the underlying... -
The effect of passenger vehicle CO2 emissions tax on consumer behaviour relating to new car purchase decisions
Item type: Journal Article • Journal: South African Journal of Accounting Research • Authors: Gerhard Nienaber --- , South Africa Barend Barnard --- , South AfricaCarbon dioxide (CO2) emissions and the resultant negative effects thereof on the environment due to climate change remain a global challenge. In South Africa, passenger vehicles contribute significantly to the amount of CO2 that is emitted into the atmosphere. In... -
Soil organic carbon storage in a tropical freshwater wetland: the influence of vegetation type
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: David Were --- , Ethiopia Frank Kansiime --- , Uganda Tadesse Fetahi --- , Ethiopia Thomas Hein --- , AustriaThe impact of different vegetation communities on soil organic carbon (SOC) in a tropical freshwater wetland in Uganda was investigated. SOC content, density and storage potential were determined under three different dominant vegetation communities: Cyperus papyrus L., Typha latifolia L... -
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... -
Pozzolanic and hydration properties of kamafugites and carbonatitic lavas as supplementary cementitious materials in Portland cement
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: A. Buregyeya --- School of Civil and Environmental Engineering, South Africa S. Nwaubani --- School of Civil and Environmental Engineering, South Africa W. Schmidt --- BAM Federal Institute for Materials Research and Testing, Germany A. G. Kerali --- Department of Civil and Environmental Engineering, Uganda U. Bagampadde --- Department of Civil and Environmental Engineering, UgandaKamafugites and carbonatites, being materials of volcanic origin with carbonates as their primary minerals, are relatively low in silica and alumina saturation. Their silica and alumina under-saturation is considered a limiting factor in pozzolanic reactivity; however, these materials are currently... -
Fifty-five-year longevity for the largest member of the family Sparidae: the endemic red steenbras Petrus rupestris from South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: AH Andrews --- , United States MJ Smale --- , South Africa PD Cowley --- , South Africa N Chang --- , South AfricaA previous study that explored the age and growth of red steenbras Petrus rupestris (Valenciennes, 1830), a large sparid (family Sparidae, seabreams or porgies) endemic to South Africa and reported to approach 2 m in length, provided estimates as a... -
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... -
Long-term effects of pig slurry application on selected soil quality parameters and tissue composition of maize in a subhumid subtropical environment
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Tichaedza J Chikuvire --- School of Agricultural Earth and Environmental Sciences, South Africa Pardon Muchaonyerwa --- School of Agricultural Earth and Environmental Sciences, South Africa Rebecca Zengeni --- School of Agricultural Earth and Environmental Sciences, South AfricaEffects of long-term application of pig slurry (PS) on soil organic carbon (SOC) pools, nutrients and maize tissue composition under continuous conventional tillage in a maize–soyabean rotation system in subhumid subtropical environments are unclear. The soil and plant parameters have... -
Impact of land use on woody aboveground biomass in Miombo woodlands of western Zambia – comparison of three allometric equations
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Priscilla Sichone --- Institute for Plant Science and Microbiology, University of Hamburg, Germany Ute Schmiedel --- Institute for Plant Science and Microbiology, University of Hamburg, Germany Jens Oldeland --- Institute for Plant Science and Microbiology, University of Hamburg, Germany Norbert Jürgens --- Institute for Plant Science and Microbiology, University of Hamburg, GermanyGlobally, the intensification of land use for agriculture, timber and fuel is considered the leading threat to the diversity and biomass of forests and woodlands. To suggest management options, it is important to understand the patterns and drivers of diversity,... -
Relationship between carbon stocks and tree species diversity in a humid Guinean savanna landscape in northern Sierra Leone
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Edward Amara --- Earth Change Observation Laboratory, Department of Geosciences and Geography, Finland Janne Heiskanen --- Earth Change Observation Laboratory, Department of Geosciences and Geography, Finland Ermias Aynekulu --- World Agroforestry Centre (ICRAF), Kenya Petri KE Pellikka --- Earth Change Observation Laboratory, Department of Geosciences and Geography, FinlandGlobal sustainable development goals include reducing greenhouse gas emissions from land-use change and maintaining biodiversity. Many studies have examined carbon stocks and tree species diversity, but few have studied the humid Guinean savanna ecosystem. This study focuses on a humid... -
Effect of mound-building termites on soil physicochemical properties and sugarcane stalk heights
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Sandile S Mthimkhulu --- South African Sugarcane Research Institute, South Africa Neil Miles --- South African Sugarcane Research Institute, South Africa Louis W Titshall --- South African Sugarcane Research Institute, South Africa Phesheya Dlamini --- Department of Plant Production, Soil Science and Agricultural Engineering, South AfricaThis study investigated soil factors responsible for localised patches of enhanced sugarcane growth on the remains of termite (Macrotermes natalensis) mounds observed on predominantly coarse-textured soils (weak sands) of KwaZulu-Natal province, South Africa. Soil samples (0–20 cm depth) were collected... -
Soil organic carbon in agricultural systems of six countries in East Africa – a literature review of status and carbon sequestration potential
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: S Namirembe --- Stepup Standard Ltd., Uganda K Piikki --- Swedish University of Agricultural Sciences (SLU), Sweden R Sommer --- WWF Deutschland, Agriculture & Land Use Change, Germany M Söderström --- Swedish University of Agricultural Sciences (SLU), Sweden B Tessema --- Ethiopian Institute of Agricultural Research (EIAR), Ethiopia SS Nyawira --- International Center for Tropical Agriculture (CIAT), KenyaCropland soils are considered to have the potential to sequester atmospheric CO2 through agronomic best management practices (BMPs). To estimate this potential in East Africa, the authors reviewed 69 published studies from Ethiopia, Kenya, Rwanda, Tanzania, Uganda, and Burundi assessing... -
Influence of oats cover crop preceding dryland lucerne establishment on some aspects of soil microbial ecology
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Anélia Marais --- Directorate Plant Sciences, Western Cape Department of Agriculture, South Africa Johan Labuschagne --- Directorate Plant Sciences, Western Cape Department of Agriculture, South Africa Mardé Booyse --- Agricultural Research Council – Biometry, South AfricaThe use of cover crops to enhance soil ecology is widely propagated. Soil samples were collected at five depths from plots in newly established (four months) dryland lucerne (Medicago sativa) pasture. Preceding this establishment, the plots were either under Saia... -
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... -
Carbon stock in the community managed Sal (Shorea robusta) forests of Dadeldhura district, western Nepal
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Suresh Prashad Bhatta --- , Nepal Anjana Devkota --- , NepalFour community-managed Sal forests in Dadeldhura district of Nepal were selected for the assessment of carbon stock. The stratified random sampling method was applied to measure the field data from 105 sample plots of 100 m2. The carbon stock of... -
Soil β-glucosidase activity, organic carbon and nutrients in plant tissue in response to cover crop species and management practices
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Adewole T Adetunji --- , South Africa Bongani Ncube --- , South Africa Andre H Meyer --- , South Africa Reckson Mulidzi --- , South Africa Francis B Lewu --- , South AfricaCover crop (CC) management can be improved to enhance carbon storage, microbial activity and fertility in agricultural soils. This study assessed the immediate effect of living CCs and residues, two termination stages (vegetative and flowering) and two termination methods (slash... -
Differences in soil microbial communities and enzyme activity due to the application of bioslurry under cultivation
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Motiki M Mofokeng --- , South Africa Johan Habig --- , South Africa Stephen O. Amoo --- , South Africa Christian P du Plooy --- , South Africa Phatu W Mashela --- , South Africa Mokhele E Moeletsi --- , South Africa Sonja Venter --- , South Africa Hintsa T Araya --- , South AfricaSoil micro-organisms influence soil ecosystem processes and properties. Their influence can be modified by cultivation practices, which affect their interaction with cultivated plants as well as soil physical and chemical properties. The study investigated differences in soil microbial activities between... -
A characterisation of wetland soil types on the Maputaland Coastal Plain
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: ML Pretorius --- , CW van Huyssteen --- , LR Brown --- , AT Grundling --- , CT Downs --- ,This paper addresses the shortage of wetland soil data on the Maputaland Coastal Plain. It does so by investigating the relationship between wetland types, slope position and soil properties. Four wetland types (a valley-bottom system, perched pans, hygrophilous grasslands and... -
Mixed-species plantations of Eucalyptus and Acacia mangium increase labile carbon and phosphorus levels in Ferralsol soils in the Cerrado biome, Brazil
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Wilbert Valkinir Cabreira --- , Brazil Marcos Gervasio Pereira --- , Brazil Fabiano de Carvalho Balieiro --- , Brazil Eduardo da Silva Matos --- , Brazil Renato de Aragão Ribeiro Rodrigues --- , Brazil Raissa Nascimento dos Santos --- , BrazilIn order to clarify the effect of mixed planting in the dynamics of phosporus (P), we assessed the fractions of this element in mixed plantings of Eucalyptus urophylla × E. grandis (Urograndis) and Acacia mangium in a tropical soil clay,... -
Estimating above-ground biomass of individual trees with terrestrial laser scanner and 3D quantitative structure modelling
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Tasiyiwa P Muumbe --- , Zimbabwe Paradzayi Tagwireyi --- , Zimbabwe Pride Mafuratidze --- , Zimbabwe Yousif Hussin --- , The Netherlands Louise van Leeuwen --- , The NetherlandsThis study explored the feasibility of using the terrestrial laser scanner (TLS) and quantitative structure modelling (QSM) to estimate the above-ground biomass (AGB) of individual trees in the tropical rainforest using data from the Ayer Hitam Forest Reserve, Malaysia. We... -
Tier 2 above-ground biomass expansion functions for South African plantation forests
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Steven Dovey --- , South Africa Ben du Toit --- , South Africa Jacob Crous --- , South AfricaCarbon stocks estimated for greenhouse gas emission reporting in South African plantation forests require improvement for local relevance. We developed biomass expansion and conversion factor (BECF) models to convert enumeration data to above-ground biomass (AGB) for major genera. Local biomass... -
Effects of fragmented mangroves on macrozoobenthos: a case study of mangrove clearance for powerline right-of-way at Oproama Creek, Niger Delta, Nigeria
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: N Zabbey --- , Nigeria IG Ekpenyong --- , Nigeria GN Nwipie --- , Nigeria IC Davies --- , Nigeria K Sam --- , NigeriaMangroves are vulnerable to varying magnitudes of degrading impact by human activities. Despite the many benefits of mangrove ecosystems, mangroves in the Niger Delta region are often cleared for electric powerline and oil pipeline rights-of-way, recreation, road construction, housing and... -
Risk assessment of polycyclic aromatic hydrocarbons in the sediments of the Ekulu River in Enugu State in Nigeria
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: Uzochukwu C Ugochukwu --- , Nigeria Onyechi H Onuora --- , Nigeria Leonard Kurumeh --- , Nigeria Uchenna I Mbakwe --- , Nigeria Obiageli J Okolo --- , Nigeria Amaka L Onuorah --- , NigeriaThe human health and ecological risks resulting from exposure to polycyclic aromatic hydrocarbons (PAHs) in the Ekulu River sediments were estimated in this study. The Ekulu River receives pollutants potentially containing polycyclic aromatic hydrocarbons (PAHs) from runoff from automotive workshops... -
Organic carbon content in the diagnostic horizons and materials of South African soil forms
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: CW van Huyssteen --- , South Africa NR Rantoa --- , South Africa CC du Preez --- , South AfricaSoil classification aims to group similar soils to facilitate communication and management. Management of soil organic carbon is gaining international recognition in an attempt to manage atmospheric carbon in addressing global warming. This paper explored the soil morphological and analytical... -
Soil C sequestration and CO2 fluxes under maize-based Conservation Agriculture systems in the Eastern Cape, South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Lindah Muzangwa --- , South Africa Pearson Nyari Stephano Mnkeni --- , Tanzania Cornelius Chiduza --- , South AfricaTraditional farming methods deplete soil carbon and contribute to carbon dioxide (CO2) emissions. We investigated the effects of Conservation Agriculture principles on C sequestration and CO2 flux from two agroecological regions in the Eastern Cape province, South Africa, over five... -
Soil management for carbon sequestration
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Rattan Lal --- , United StatesAn increase in atmospheric CO2 by ∼146% and global temperature by ∼1 °C since the year ca. 1750 has created an urgency to identify potential sinks for storage of excess CO2. The historic depletion of soil organic carbon (SOC) from... -
Response of soil carbon fractions in a Haplic Cambisol to crop rotation systems and residue management practices under no tillage in the Eastern Cape, South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: I Gura --- , South Africa PNS Mnkeni --- , South Africa CC du Preez --- , South Africa JH Barnard --- , South AfricaSoil organic carbon (SOC) is a major indicator of soil quality and/or health but its slow short-term response to management changes has prompted the search for more sensitive indicators for monitoring short-term changes in soil organic matter (SOM). This study... -
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... -
Aggregate dynamics and intra-aggregate carbon contents as influenced by long-term wheat production management in semi-arid South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: LS Tlomatsana --- , South Africa PF Loke --- , South Africa E Kotzé --- , South Africa MP Aghoghovwia --- , South AfricaSoil aggregate dynamics have received renewed interest due to their relevance in carbon (C) stabilisation. This study evaluated changes in aggregate-size distribution and intra-aggregate C following 41 years of wheat production in semi-arid central South Africa. Management practices that have... -
Effect of biochar, farmyard manure, and lime on soil properties, and on growth and nutrient uptake of wheat on acidic soils in Southern Ethiopia
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Mekedes Lulu --- , Ethiopia Bekele Lemma --- , Ethiopia Legesse Hidoto --- , Ethiopia Asmare Melese --- , EthiopiaThis study assessed the effect of the interactions of biochar (BC), farmyard manure (FYM) and lime on soil chemical properties, and on different wheat attributes in Southern Ethiopia. The experimental design was a randomised complete block in three replications. The... -
Heterogeneous investor attention to climate risk: Evidence from a unique dataset
Item type: Journal Article • Journal: Investment Analysts Journal • Authors: Hyejin Park --- , South Korea Minki Kim --- , South Korea Doojin Ryu --- , Republic of KoreaThe COVID-19 pandemic has led global investors to draw a parallel between pandemics and climate risk, focusing their attention on climate risk. We examine COVID-19’s effect on investors’ awareness of climate risk by analysing novel trading data for Korean-listed firms... -
Soil carbon stock assessment using depth and spatial models on afforested arable lands
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Trevan Flynn --- , Czech Republic Liesl Wiese --- , South Africa Andrei Rozanov --- , South AfricaThe change from grasslands and natural shrubs to afforested arable land has a major impact on soil organic carbon (SOC) stocks. Grasslands are known to be SOC sinks as seen in the Chernozems of North America, Eurasia and South Africa... -
Influence of cropping sequences on labile carbon and phosphorus fractions in a wheat-based conservation agriculture system
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: NZ Sosibo --- , South Africa E Dube --- , South Africa P Muchaonyerwa --- , South Africa TJ Tsilo --- , South AfricaWhile conservation agriculture (CA) has largely been successful in many areas, some reports suggest that certain farmers have not realised the benefits they had hoped for, especially in Africa. The benefits of CA could depend on the cropping sequences involved... -
A baseline assessment of coastal pH variability in a temperate South African embayment: implications for biological ocean acidification research
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: C Edworthy --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa WM Potts --- South African Institute for Aquatic Biodiversity (SAIAB), South Africa S Dupont --- University of Gothenburg, Sweden MI Duncan --- Rhodes University, South Africa TG Bornman --- Institute for Coastal and Marine Research, Nelson Mandela University, South Africa NC James --- South African Institute for Aquatic Biodiversity (SAIAB), South AfricaCompared with the open ocean, knowledge of pH variability in coastal waters is rudimentary, especially in Africa. This is concerning as quantifying local pH conditions is critical when assessing the response of coastal species to future ocean acidification scenarios. The... -
A balanced perspective on the contribution of extensive ruminant production to greenhouse gas emissions in southern Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Michiel M Scholtz --- , South Africa Frans J Jordaan --- , South Africa N Thuli Chabalala --- , South Africa Georgette M Pyoos --- , South Africa M Joel Mamabolo --- , South Africa Frederick WC Neser --- University of the Free State, South AfricaThere is a general perception that ruminants produce large quantities of greenhouse gases (GHG) which contribute to global warming. Ruminant production is also known as the world’s largest user of land, and southern Africa is no exception. Recent estimates indicate... -
Sustainability of energy transition on output growth and carbon emission abatement in sub-Saharan Africa
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Ikechukwu Sebastine Asogwa --- Michael Okpara University of Agriculture, Nigeria Charles Nnamdi Anumudu --- Michael Okpara University of Agriculture, NigeriaThis study examined the effects of renewable energy use on the output growth convergence, as well as the impacts of renewable energy use for an alternative to carbon emission (CO2) abatement in sub-Saharan Africa (SSA). The dual purpose followed the... -
Predicting soil carbon in granitic soils using Fourier-transform mid-infrared (FT-MIR) spectroscopy: the value of database disaggregation
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Kelebohile Rose Seboko --- University of the Free State, South Africa Johan van Tol --- University of the Free State, South Africa Elmarie Kotze --- University of the Free State, South AfricaSoil carbon (C) is an important component in quality assessments and efficient models are required to estimate C rapidly. Accurate C assessments are valuable in monitoring land-use changes. Fourier-transform mid-infrared (FT-MIR) spectroscopy has proved to be a powerful tool for... -
Slow tourism motivations: a factor/cluster segmentation approach
Item type: Journal Article • Journal: Research in Hospitality Management • Authors: Wagnew Eshetie Tsegaw --- Bahir Dar University, EthiopiaMarket segmentation has become a valuable instrument in planning appropriate marketing strategies. Therefore, the overall purpose of this study is to explore slow tourists’ characteristics, revealing the differences in their motivations using a factor/cluster market segmentation approach. The sample population... -
Evaluating the effects and benefits of cover crops in citrus orchards: a review
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Sibongiseni Silwana --- ARC Infruitec-Nietvoorbij, South Africa Azwimbavhi Reckson Mulidzi --- ARC Infruitec-Nietvoorbij, South Africa Nebo Jovanovic --- University of the Western Cape, South AfricaCover crops are used in sustainable agricultural practices to improve soil quality and minimise the effect of climate change, water restrictions and drought. The South African citrus industry produces and exports a diverse range of citrus fruits; however, knowledge of... -
Effects of land use and site on organic carbon fractions in some humic soil profiles of KwaZulu-Natal, South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: --- School of Agricultural, South Africa --- School of Agricultural, South Africa --- School of Agricultural, South Africa --- School of Agricultural, South AfricaSoil organic matter (SOM) and its different carbon (C) fractions play a vital role in storing C and are a source of plant nutrients in natural and managed ecosystems. This study was conducted at six sites in KwaZulu-Natal Province to... -
A systematic review of remote sensing and machine learning approaches for accurate carbon storage estimation in natural forests
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Collins Matiza --- University of KwaZulu-Natal, South Africa Onisimo Mutanga --- University of KwaZulu-Natal, South Africa Kabir Peerbhay --- University of KwaZulu-Natal, South Africa John Odindi --- University of KwaZulu-Natal, South Africa Romano Lottering --- University of KwaZulu-Natal, South AfricaThe assessment of carbon storage in natural forests is paramount in the ongoing efforts against climate change. While traditional field-based methods for quantifying carbon storage pose challenges, recent advancements in remote sensing and machine learning offer efficient and innovative alternatives... -
Digital soil mapping enables informed decision-making to conserve soils within protected areas
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: George M van Zijl --- North-West University, South Africa Johan van Tol --- University of the Free State, South AfricaProtected areas are regarded as pristine land, but often they require rehabilitation and effective management to prevent increased land degradation. Soil management should be based on soil maps, which are difficult to create in protected areas due to their large... -
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... -
Evaluating the role of combustible renewable and waste in reducing greenhouse gas emissions in the long run in Malaysia
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Jayanthi R Alaganthiran --- Universiti Malaya, Malaysia Santha Chenayah --- Universiti Malaya, Malaysia Rajah Rasiah --- Universiti Malaya, MalaysiaMalaysia has been struggling to effectively manage waste which accounts for a substantial amount of greenhouse gases. Thus, the objective of this study was to identify whether renewable energy from combustible renewable and waste could significantly reduce the total greenhouse... -
Partitioning the sources of sediment organic carbon in South African seagrass meadows
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: A Bossert --- Stellenbosch University, South Africa S von der Heyden --- Stellenbosch University, South Africa J Colling --- Stellenbosch University, South Africa A Ndhlovu --- Stellenbosch University, South AfricaIn the sediments of seagrass meadows, allochthonous carbon sources can account for 50–90% of sediment organic carbon (SOC), in which non-seagrass carbon is derived from external organic matter advected into the meadow’s sediments or trapped by the seagrass canopy. Identifying... -
Contrast in larval sensitivity to low pH in sea urchins from neighbouring seagrass meadows at Inhaca Island, Mozambique
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: JA Duvane --- Eduardo Mondlane University, Mozambique D Cossa --- Eduardo Mondlane University, Mozambique DC de Abreu --- Eduardo Mondlane University, Mozambique M Mafambissa --- Eduardo Mondlane University, Mozambique MP Scarlet --- Eduardo Mondlane University, Mozambique A Macia --- Eduardo Mondlane University, Mozambique S Dupont --- University of Gothenburg, SwedenOcean acidification presents a major threat to marine life, and a large body of evidence has documented its negative effects on various marine species and ecosystems. Recent meta-analyses highlight the key role of local adaptation and have linked species’ sensitivity... -
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... -
From forage to multifunctionality: shifting perceptions of rangeland ecosystem services in the journals of the Grassland Society of Southern Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Craig D Morris --- University of KwaZulu-Natal, South AfricaRangelands offer various goods and ecosystem services (ES) besides providing forage for commercial livestock production. An analysis of research published in the journals of the Grassland Society of Southern Africa from 1966 to 2023 revealed a widening focus on different... -
Techno-economic and environmental assessment of battery integrated wind farm siting across offshore Nigeria
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Gbubemi Kevin Akporhonor --- Energy and Environment Cranfield University, United KingdomThis study investigates the economic, technical, and environmental impacts of integrating a battery energy storage system (BESS) with an offshore wind farm near Koko Sea Port, Nigeria. As renewable energy curtailment increases and Nigeria’s energy demand grows, energy storage systems... -
Evaluating the histopathology, condition index and stress-on-stress response of caged brown mussels Perna perna for monitoring marine coastal pollution in Senegal
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: F Tabane --- Centre Régional de Recherche en Écotoxicologie et Sécurité Environnementale (CERES-Locustox), Unité Biologie, Senegal F Cazier --- Centre Commun de Mesures, Université du Littoral Côte d’Opale, France D Dewaélé --- Centre Commun de Mesures, Université du Littoral Côte d’Opale, France K Hylland --- University of Oslo, Norway CT Ba --- Université Cheikh Anta Diop, Senegal M Fall --- Université Cheikh Anta Diop, SenegalThis study is the first in a coastal West African country to evaluate the histopathology, condition index and stress-on-stress response time of caged brown mussels Perna perna for use in pollution monitoring of coastal ecosystems. Perna perna collected from an... -
Managing drought stress in wheat (Triticum aestivum L.) production: strategies and impacts
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Maltase Mutanda --- University of South Africa, South Africa Hussein Shimelis --- School of Agricultural, South Africa Vincent Chaplot --- School of Agricultural, South Africa Sandiswa Figlan --- University of South Africa, South AfricaDrought stress is a major constraint to sustainable wheat production worldwide, including sub-Saharan Africa, where environmental and poor agronomic practices exacerbate the yield gap. Drought disrupts physiological, biochemical, and molescular processes, negatively impacting crop growth, grain yield and quality. This... -
The effect of eucalypt slash burning and repeated disc harrowing on fuel load reduction, soil properties, and stand productivity
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Angel A Goldsmith --- Stellenbosch University, South Africa Ben du Toit --- Stellenbosch University, South AfricaIn plantation forestry systems, disc harrowing is sometimes used as a fuel load reduction measure to minimise wildfire risk. This study reports the long-term effects of repeated disking on fuel loading, soil properties and tree growth in two eucalypt stands... -
Intrapopulation isotopic niche structure in mammalian carnivores and herbivores across contrasting habitats
Item type: Journal Article • Journal: African Zoology • Authors: Chanel Lewis --- University of the Free State, South Africa Runè van der Merwe --- University of the Free State, South Africa Chabi AMS Djagoun --- University of Abomey-Calavi, Benin Etotépé A Sogbohossou --- University of Abomey-Calavi, Benin Daryl Codron --- University of the Free State, South AfricaNatural communities exhibit ecological gradients that result in a variety of competitive interactions and variations in niche patterns. Changes in resource availability affect the size of a species’ niche: it expands when a variety of resources are abundant and contracts... -
Assessment of near-infrared reflectance spectroscopy for monitoring soil carbon, nitrogen and organic matter in South African forestry plantations
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: DR Ramesar --- Institute for Commercial Forestry Research, South Africa DS Naidoo --- Institute for Commercial Forestry Research, South Africa GD Cooper --- Institute for Commercial Forestry Research, South Africa RJ Burgdorf --- Institute for Commercial Forestry Research, South AfricaSoil organic matter, carbon and nitrogen contribute to soil quality, which influences plant growth. In forestry planta- tions soil carbon, nitrogen and organic matter significantly influence site productivity. In South Africa, plantation forestry occurs across a diverse landscape requiring assessment... -
Model and measure: comparing soil organic carbon stocks quantification approaches at field scale in South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Willie Herman Cloete --- North-West University, South Africa Gerhard du Preez --- North-West University, South Africa George Munnik van Zijl --- North-West University, South AfricaThere is an ongoing debate about the most appropriate approach for quantifying changes in soil organic carbon stocks (SOCS). The aim of the study was to evaluate the performance of the Rothamsted carbon (RothC) modelling approach against the re-measured SOCS...