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Site Evaluation in Black Wattle with Special Reference to Soil Factors
Item type: Journal Article • Journal: South African Forestry Journal • Authors: A. P.G. Schönau --- Silviculture Section, Institute for Commercial Forestry Research, South Africa W. J.K. Aldworth --- Silviculture Section, Institute for Commercial Forestry Research, South AfricaTogether with climate, soil characteristics are the most important factors affecting tree growth. However, the attempts in many site evaluation studies to establish a direct relationship between soil factors and tree growth have not been very successful, the exception being... -
Use of Ecological Site Classification in the Prediction of Forest Productivity and Response to Fertilisation
Item type: Journal Article • Journal: South African Forestry Journal • Authors: Reid Carter --- Forest Sciences Department, Canada Karel Klinka --- Forest Sciences Department, CanadaThe principals of biogeoclimatic ecosystem classification were used to stratify sites supporting immature stands of coastal Douglas-fir. The resulting strata were shown to represent unique segments of regional gradients of available soil moisture and nutrients. Regression models indicated strong relationships... -
The development of veld assessment in the northern Transvaal savanna I. Red Turfveld
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: M.H. Friedel --- Division of Wildlife and Rangelands Research, Australia A.C. Blackmore --- ,Grazing‐induced gradients in pasture species composition were characterized for the red turfveld of the Northern Transvaal savanna. A proposed classification of pasture species response to grazing was developed and the influence of state variables and driving forces other than grazing... -
The development of veld assessment in the northern Transvaal savanna II. Mixed bushveld
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: M.H. Friedel --- Division of Wildlife and Rangelands Research, AustraliaDifferences in pasture species composition as a consequence of grazing were used to develop a proposed classification of pasture species response to grazing, for both the Combretum apiculatum and the Acacia tortilis communities of the northern Transvaal mixed bushveld. The... -
Habitat preferences of twenty‐three grass species in the Bankenveld
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: F.P. Jordaan --- Department of Agricultural Development, Highveld Region, Republic of South Africa A.S. de Beer --- Department of Agricultural Development, Highveld Region, Republic of South AfricaSome grass species occur more frequently in certain habitats than in others. There is, however, uncertainty as to exactly which factors are responsible for this phenomenon. Species composition as well as habitat data were collected from plots situated on the... -
Quantitative criteria for distinguishing melanic from vertic soil horizons in the central Kruger National Park
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: S.W. Fraser --- Department of Geography, T.H. van Rooyen --- Department of Geography, E. Verster --- Department of Geography,Criteria based on shrink-swell potential, viz. linear shrinkage and COLErod, were used to distinguish between melanic and vertic soil horizons of the Mooiplaas region in central Kruger National Park. For linear shrinkage the proposed boundary value separating melanic and vertic... -
A multivariate approach to a specific problem of grouping maize cultivars
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: MarieF. Smith --- , Republic of South AfricaThe use of multivariate techniques in the analysis of multivariate problems is illustrated by comparing the results of univariate and multivariate techniques applied to the problem of establishing the nutritional requirements of, and the acid tolerance differences between maize cultivars... -
The base status criterion in South African soil classification
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: M.V. Fey --- Department of Agronomy, Republic of South Africa M.J. Donkin --- , Republic of South AfricaEvidence is considered which indicates that the sum of extractable bases and acidity, termed the effective cation exchange capacity (ECEC), is a more reliable criterion than the S-value (sum of exchangeable bases only) for differentiating soils in terms of the... -
The relationship between subsoil colour and degree of wetness in a suite of soils in the Grabouw district, Western Cape I. Characterization of colour-defined horizons
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: C.W. van Huyssteen --- , South Africa F. Ellis --- , South AfricaSoil colour is an easily identifiable property that is invariably used as a parameter in all soil classification systems including the system used in South Africa. To test the hypothesis that soil colour is a reflection of the soil water... -
The relationship between subsoil colour and degree of wetness in a suite of soils in the Grabouw district, Western Cape II. Predicting duration of water saturation and evaluation of colour definitions for colour-defined horizons
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: C.W. van Huyssteen --- , South Africa F. Ellis --- Faculty of Forestry, South Africa J. J.N. Lambrechts --- Faculty of Agricultural Sciences, South AfricaExisting colour indices were evaluated to determine their correlation with duration of water saturation, for a hydrosequence in the Grabouw district, Western Cape. Correlation coefficients ranged between 0.31 and 0.63. More simple colour indices were developed. Dry soil colour is... -
Recognition of natural soil bodies using textural properties of red freely drained soil profiles from KwaZulu-Natal and Mpumalanga
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: D.P. Turner --- , South Africa M.C. Laker --- Department of Plant Production and Soil Science, South AfricaThe research examines the range of variation of soil texture for red freely drained soils associated with six of the major geological formations of KwaZulu-Natal and Mpumalanga. The soil profile information is derived from particle size analyses of over 4... -
Nature and distribution of South African plinthic soils: Conditions for occurrence of soft and hard plinthic soils
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: P. A.L. le Roux --- 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 AfricaThe relevance of using redox morphology and irreversible hardened material to classify soft and hard plinthic soil forms is often questioned as the paleoclimate of South Africa varied significantly. Since the origin of the Soil Classification System of South Africa... -
Duration of water saturation in selected soils of Weatherley, South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: C.W. van Huyssteen --- Department of Soil, South Africa P. A.L. le Roux --- Department of Soil, South Africa M. Hensley --- Department of Soil, South Africa T.B. Zere --- Department of Soil, South AfricaSoil water contents were measured weekly for six years (1997–2005) in the Weatherley catchment in the northern Eastern Cape Province of South Africa, and used to calculate average duration of water saturation above 70% of porosity (ADs>0.7). Data were used... -
Principles of soil classification and the future of the South African system
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: CW van Huyssteen --- Soil, Crop and Climate Science, South Africa DP Turner --- ARC–Institute for Soil, South Africa PAL Le Roux --- Soil, Crop and Climate Science, South AfricaHumans classify their environment to create order, make it understandable, aid recollection and to communicate. The nature of these classifications is not always understood, because they are learnt from an early age. Building on these principles provides a sound basis... -
Perspectives on the principles and structure of the soil classification system in South Africa: discussion and practical examples
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: DavidP Turner --- , South AfricaThe paper discusses revised principles, perspectives and structure for soil classification of natural soils in South Africa. An expanded ‘sphere of pedological interest’ is proposed through the formal recognition of a wider range of subsurface soil materials. The concept of... -
A revised perspective on principles of soil classification in South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: DavidP Turner --- Agricultural Research Council-Institute for Soil, Climate and Water, South AfricaLimited significance has been given to the formal recognition of certain subsoil materials in the South African Soil Classification System. Three principles in the current classification system are discussed using variants of soil profiles associated with the Avalon soil form... -
A PRELIMINARY LIMNOLOGICAL STUDY OF BUFFELSPOORT DAM AND ITS CATCHMENT
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: R.D. Walmsley --- , D.F. Toerien --- ,A limnological survey of the Buffelspoort Dam and its catchment between 1973 and 1975 showed that the water of the area contained extremely low concentrations of dissolved minerals and that there was no point source of nutrient supply to the... -
THE DISTRIBUTION OF WETLANDS IN THE SOUTH-WESTERN CAPE PROVINCE, SOUTH AFRICA
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: M.J. Silberbauer --- Department of Water Affairs and Forestry, South Africa J.M. King --- Freshwater Research Unit, Zoology Department, South AfricaThe hydrological and habitat value of wetlands is beginning to be recognised in South Africa, but only in parts of Natal Province has an effort been made to map wetlands and to record their status over large areas. While the... -
A GEOMORPHOLOGICAL APPROACH TO THE IDENTIFICATION AND CLASSIFICATION OF INSTREAM FLOW ENVIRONMENTS
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: R.A. Wadeson --- Department of Geography, South AfricaThis paper highlights the considerable confusion that exists within the ecological literature concerning the classification of the lotic (flowing water) environments. A large number of ill defined terms has been introduced by various authors; these often relate to better defined... -
The effects of topo-edaphic variables and cultivation on the woody vegetation of Weenen Nature Reserve, KwaZulu-Natal
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: L Breebaart TG O'Connor JC Hughes CD Morris IA RushworthThe soil types and woody vegetation of Weenen Nature Reserve (WNR), KwaZulu-Natal, were described. Mispah, overlying shale, and Shortlands, overlying dolerite were the most common of 18 the soil forms encountered. Six vegetation types were identified by TWINS PAN which... -
Classification of the grass layer of semi‐arid rangeland in the Smaldeel area of the eastern Cape
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: J.C. Martens --- Dept of Agriculture, Republic of South Africa C.D. Morris --- Agricultural Research Council, Republic of South AfricaHierarchical classification based on proportional species composition of the grass layer was used to identify and classify semi‐arid rangeland into range types. The relation between range types produced by the classification and the environmental parameters measured were investigated using a... -
The vegetation of Malilangwe Wildlife Reserve, south-eastern Zimbabwe
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: BW Clegg --- The Malilangwe Trust, Research, Zimbabwe TG O'Connor --- School of Animal, Plant and Environmental Science, South AfricaThe vegetation of Malilangwe Wildlife Reserve in Zimbabwe (39 378 ha) was classified and mapped in 2003 using an integrated approach of ground-based measurement and remote sensing. Environmental variables, structure and composition of the tree, shrub and herbaceous layers were... -
A Site-growth Study of Eucalyptus grandis in the Mpumalanga Escarpment Area
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: J.H. Louw --- ,A site-growth study was conducted on Eucalyptus grandis on the granitic soils of the Mpumalanga escarpment area. The objectives were twofold, namely to identify those site factors that can be related to the growth of the species, as well as... -
A review of site-growth studies in South Africa
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: J.H. Louw --- ,The intensive nature of the South African forest industry requires reliable decision support systems to enhance site-specific silviculture. Furthermore, the principle of ecologically sustainable forest management requires a profound improvement in the understanding of the factors controlling tree growth and... -
Constructing a South African Hope Measure
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: David J. F. Maree --- University of Pretoria, Marinda Maree --- University of Pretoria, Charmaine Collins --- University of Pretoria,An instrument to assess levels of hope was developed. From a qualitative analysis of what students regarded as hope, items were constructed and a questionnaire was applied to 474 undergraduate social sciences students. The results were calibrated across gender and... -
HIV/AIDS Education in Butare-ville Secondary Schools (Rwanda): Analyzing Pedagogic Discourse Using a Bernsteinian Framework
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Wayne Hugo --- University of KwaZulu-Natal, South Africa Vedaste Nyilimana --- Kigali Institute of Education, RwandaThis article presents three case studies of how HIV/AIDS education is being organized and taught in Rwanda. It analyses what teachers were doing in 2005 through classroom teaching to safeguard young people from HIV/AIDS. A pedagogic framework is introduced and... -
Guidelines for Counsellors Working with People of African Ancestry in a Sport Context
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Lourens Human --- University of Pretoria, South Africa Taunya Tinsley --- California University of Pennsylvania, PA, Monja Muller --- University of Pretoria, South Africa Sipho Rutsate --- National University of Science and Technology, ZimbabweThe objective this article is to describe five practice guidelines for counsellors working with people of African ancestry in a sport context. The practice guidelines pertain to counsellor training, counsellor perspectives, counsellor services, counsellor ethics and counsellor research. These practice... -
A Complete Symmetry Classification and Reduction of Some Classes of the Nonlinear (1-2) Wave Equation
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: A. Ahmad --- Department of Mathematics, Saudi Arabia AshfaqueH. Bokhari --- Department of Mathematics, Saudi Arabia A.H. Kara --- School of Mathematics, South Africa F.D. Zaman --- Department of Mathematics, Saudi ArabiaA classification of symmetries of a nonlinear one-two wave equation is given with their respective commutator tables. Two dimensional Lie algebras of point symmetry generators are used to construct exact solutions for some classes invariant under the subalgebra. Comparisons and... -
Spatial variability in macroinvertebrate assemblages: comparing regional and multivariate approaches for classifying reference sites in South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: HelenF DallasSpatial variability in macroinvertebrate assemblages was examined with the aim of evaluating the utility of regional classification systems in aquatic bioassessment. Sampling was undertaken at reference sites in the Western Cape and Mpumalanga, South Africa, using the rapid bioassessment method... -
An Introduction to Digital Terrain Modelling in Forest Site Analysis—An Example from the Grabouw-Lebanon Key Area
Item type: Journal Article • Journal: South African Forestry Journal • Authors: R.N. Thwaites --- Saasveld Forestry Research Centre,An outline of the concept of digital terrain modelling (DTM) is provided which includes the model structure, data capture methods and approaches to analysis and display. Mention is made of the variety of work environments in which DTM is used... -
Detection of land cover changes around Lake Mutirikwi, Zimbabwe, based on traditional remote sensing image classification techniques
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: T Dube --- Discipline of Geography, School of Agricultural, Earth and Environmental Sciences, South Africa W Gumindoga --- Department of Civil Engineering, Zimbabwe M Chawira --- Zimbabwe Environmental Law Association, ZimbabweLand cover changes around Lake Mutirikwi in 1984–2011 were mapped from Landsat images using traditional image classification methods including the maximum likelihood classifier algorithm. The possibility of mapping the coverage and abundance of surface floating aquatic weeds was also tested... -
Photosynthetic performance, epiphyte biomass and nutrient content of two seagrass species in two areas with different level of nutrients along the Dar es Salaam coast
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: EF Mvungi --- Department of Botany, Tanzania FA Mamboya --- Department of Sciences and Laboratory Technology, TanzaniaHeavy nutrient loads in coastal waters often lead to excessive growth of microalgal and macroalgal epiphytes on seagrass leaves, with varying effects on the underlying seagrasses. This study evaluates the photosynthetic performance, epiphytic biomass and tissue nutrient content of two... -
A stratification of the South African forestry landscape based on climatic parameters
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: JH Louw --- School of Natural Resource Management, South Africa I Germishuizen --- , South Africa CW Smith --- Paperbark Forestry Consulting, South AfricaThe benefits of high-resolution forest site classification systems have been widely acknowledged in South Africa as a prerequisite for decision-making in forestry management. Although substantial research and development work have been done on categorising and mapping the soil and geological... -
Application of a direct toxicity assessment approach to assess the hazard of potential pesticide exposure at selected sites on the Crocodile and Magalies rivers, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: TM Ansara-Ross --- Centre for Aquatic Research, Department of Zoology, South Africa V Wepener --- Centre for Aquatic Research, Department of Zoology, South Africa PJ van den Brink --- Department of Aquatic Ecology and Water Quality Management, The Netherlands MJ Ross --- Centre for Aquatic Research, Department of Zoology, South AfricaThe potentially hazardous effects of agricultural pesticide usage in the Crocodile (west) Marico catchment were evaluated using the Danio rerio and Daphnia pulex lethality, Selenastrum capricornutum growth inhibition and the Ames mutagenicity plate incorporation assays. Hazard assessment categories are proposed... -
The effects of soil conditions and grazing strategy on plant species composition in a semi-arid savanna
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: M-L Britz D WardThe tree:grass ratio of savannas is important, especially in the semi-arid savannas of South Africa. An increase in tree cover leads to reduced productivity and profitability of rangelands. We investigated the effects of soil type and grazing strategy on the... -
A critical engagement with the DSM-5 and psychiatric diagnosis
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Susan Kriegler --- Department of Educational Psychology, South Africa Suzanne E Bester --- Department of Educational Psychology, South AfricaClassifications in psychiatry can result in the reification of hypothetical approaches, arbitrary categorisation and social injustice. This article applies a social constructivist approach to critique the DSM-5 as a neurobiological model of psychiatric diagnosis which ignores psychosocial factors such as... -
Towards a classification of Tanzanian rivers: a bioassessment and ecological management tool. A case study of the Pangani, Rufiji and Wami–Ruvu river basins
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: LT Kaaya --- Department of Aquatic Sciences and Fisheries, TanzaniaRiver classification is important for reporting ecological status and for the general ecological management of river systems by partitioning natural variability. A priori river classification by abiotic variables and validation of classifications obtained using aquatic macroinvertebrates from reference sites for... -
Indexing the human: from classification to a critical politics of transformation
Item type: Journal Article • Journal: Anthropology Southern Africa • Authors: Thomas Cousins --- Department of Sociology and Social Anthropology, South Africa Lindsey Reynolds --- Department of Sociology and Social Anthropology, South Africa“Indexing the Human: From Classification to a Critical Politics of Transformation” consisted of a year-long programme of seminars, workshops and reading groups at Stellenbosch University in 2014–2015. The seminar series brought together local, regional and international scholars around four thematic... -
Integral and discrete representations of some H q -semiclassical forms
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Manoubi Mejri --- , , TunisiaThe aim of this paper is to deduce integral and discrete representations of some H q -semiclassical forms of class one. These forms were studied by B. Bouras and F. Marcellan in [1], (Quadratic decomposition of a family of... -
The value of six key soil variables for incorporation into a South African forest site classification system
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Josua H Louw --- School of Natural Resource Management, South AfricaThe intensive nature of management practices in the exotic monoculture plantations of South Africa requires reliable decision support systems. Recent socio-economic developments, the need for optimal forest productivity, as well as increasing awareness of broader ecosystem values and environmental risks,... -
Name changes and additions to the southern African freshwater fish fauna
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: PH Skelton --- South African Institute for Aquatic Biodiversity (SAIAB), South AfricaChanges made to the scientific names of southern African freshwater fishes since 2001 are explained and discussed. Adjustments to the phylogeny and classification of the fauna are outlined. Recent systematic studies on cyprinines are discussed and changes to the genera... -
In pursuit of a South African national soil database: potential and pitfalls of combining different soil data sets
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: George M van Zijl --- University of the Free State, South Africa Jacobus O Botha --- Natural Resources Section, KwaZulu-Natal Department of Agriculture and Rural Development, South AfricaA national soil profile database will be a huge asset to South Africa, enabling improved soil information products to be created. However, numerous practical pitfalls exist in reliably creating such a database. This project aimed to identify such pitfalls, while... -
On the self-convolution of generalized Fibonacci numbers
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Hacène Belbachir --- , Algeria Toufik Djellal --- , Algeria Jean-Gabriel Luque --- Normandie Université, Université de Rouen, FranceWe focus on a family of equalities pioneered by Zhang and generalized by Zao and Wang and hence by Mansour which involves self convolution of generalized Fibonacci numbers. We show that all these formulas are nicely stated in only one... -
Variation in selected solid wood properties of young Pinus patula from diverse sites in the Mpumalanga escarpment area in South Africa
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Barry G Muller --- Nelson Mandela Metropolitan University, South Africa Josua H Louw --- Nelson Mandela Metropolitan University, South Africa Francois S Malan --- Research Centre, South Africa (retired)Regression analyses identified ‘Growth Days’ (an index expressing site moisture availability) as the only site variable contributing significantly to the prediction to wood density (R2 = 0.57), whereas the model predicting grain angle included only ‘Altitude’ (R2 = 0.60). These... -
Consumption patterns and demographic factors influence on fruit juice classifications, health benefits and sugar content perceptions in two Municipal Districts in Cape Town, Western Cape, South Africa
Item type: Journal Article • Journal: South African Journal of Clinical Nutrition • Authors: Rodney Graeme Duffett --- Marketing Department, South AfricaObjectives: The study ascertained consumer perceptions of differences between fruit juice classifications regarding their respective health benefits and sugar content. The research also considered the influence of consumption patterns and demographic factors. -
Use of the American Society of Anesthesiologists Physical Status Classification in non-trauma surgical versus trauma patients: a survey of inter-observer consistency
Item type: Journal Article • Journal: Southern African Journal of Anaesthesia and Analgesia • Authors: Shree Singaram --- Anaesthesiology and Critical Care, South Africa Sailuja Naidu --- Anaesthesiology and Critical Care, South AfricaBackground: The American Society of Anesthesiologists-Physical Status (ASA-PS) Classification is a grading system for classifying surgical patients based on their co-morbid background. Despite numerous benefits, its highly subjective nature has led to marked inconsistency when used. The purpose of this... -
A Decision Tree and Naïve Bayes algorithm for income tax prediction
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: G. V. Mabe-Madisa --- Department of Decision Sciences, South AfricaOne of the concerns regarding the tax collection system is incorrect case selection. Manual selection of audit cases by auditors (whose role is to detect individual cases of tax non-compliance) based on their expert knowledge of the taxpayers’ behaviour, cannot... -
Soil taxonomy proposals for acid sulfate soils and subaqueous soils raised by the 8th International Acid Sulfate Soils Conference
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Barret M Wessel --- Department of Environmental Science and Technology, USA John M Galbraith --- Department of Crop and Soil Environmental Sciences, USA Mark H Stolt --- Department of Natural Resources Science, USA Martin C Rabenhorst --- Department of Environmental Science and Technology, USA Delvin S Fanning --- Department of Environmental Science and Technology, USA Maxine J Levin --- USDA-Natural Resources Conservation Service, USAThe 8th International Acid Sulfate Soils Conference presented examples and discussions for classification of ‘acid sulfate soils’ and related issues for ‘subaqueous soils’. When these soils are disturbed or exposed, the sulfides (predominantly pyrite) react with oxygen to produce sulfuric... -
Spodosols in Brazil: distribution, characteristics and diagnostic attributes of spodic horizons
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Andressa R de Menezes --- Agronomy Institute, Department of Soil Science, Brazil Ademir Fontana --- Embrapa Solos, Brazil Lúcia HC dos Anjos --- Agronomy Institute, Department of Soil Science, BrazilSpodosols are reported in specific environments of Brazil, such as sandy materials in the Amazon and Pantanal basin, sandbanks in the coastal fringes and coastal tableland areas, and a few in high-altitude mountains with quartz-rich rocky substrates. This study describes... -
Where are we with whole regolith pedology? A comparative study from Brazil
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Jérôme Juilleret --- Department of Environmental Research and Innovation, Luxembourg Antonio C de Azevedo --- Department of Soil Science, Brazil Roseclenia A Santos --- Department of Soil Science, Brazil Jean CB dos Santos --- Department of Agronomy, Brazil Fabricio de A Pedron --- Department of Soil Science, Brazil Stefaan Dondeyne --- Department of Earth and Environmental Sciences, BelgiumAn integrated knowledge of the soil and its deeper substratum is required when dealing with environmental issues and Critical Zone research. Though the lower boundary for classifying soils is set at 200 cm in both Soil Taxonomy (ST) and the... -
Impacts of fundamental changes to Soil Taxonomy
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: John M Galbraith --- Department of Crop and Soil Environmental Sciences, USA Mark H Stolt --- Department of Natural Resources Science, USA Martin C Rabenhorst --- Department of Environmental Science and Technology, USA Michel D Ransom --- Department of Agronomy, USASoil Taxonomy is one of the dominant soil classification systems in the world, but has undergone revisions on a regular basis since 1983. It is larger and some parts have become difficult to apply without considerable experience. Some pedologists that... -
Describing gonad development and gametogenesis in southern Africa’s endemic box jellyfish Carybdea branchi (Cubozoa, Carybdeidae)
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: R Mohamed --- Department of Biodiversity and Conservation Biology, South Africa H Skrypzeck --- Department of Biodiversity and Conservation Biology, South Africa MJ Gibbons --- Department of Biodiversity and Conservation Biology, South AfricaInformation on the reproductive development of species of box jellyfish (class Cubozoa) is poor globally, despite their significance as potent stingers and worrying projections about range expansions. While most species are confined to tropical and subtropical waters, the South African... -
Some new results on functions in C(X) having their support on ideals of closed sets
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Sudip Kumar Acharyya --- Department of Pure Mathematics, India Sagarmoy Bag --- Department of Pure Mathematics, India Goutam Bhunia --- Department of Pure Mathematics, India Pritam Rooj --- NIIT University, IndiaFor any ideal of closed sets in X, let be the family of those functions in C(X) whose support lie on . Further let contain precisely those functions f in C(X) for which for each ϵ > 0, {x ∈... -
Hydropedological grouping of South African soil forms
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Johan J van Tol --- Department of Soil, Crop and Climate Sciences, South Africa Pieter AL Le Roux --- Institute for Groundwater Studies, University of the Free State, South AfricaThe science of hydropedology has progressed significantly in the past two decades, especially with regards to the interpretation of soil morphology and relating these interpretations to the hydrological behaviour of horizons, profiles, hillslopes and catchments. Soil classification is pivotal to... -
Clay and iron oxide contents of prismacutanic B, G, soft plinthic B, and E horizons described during the land type survey of South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Anizka Stolk --- Department of Soil, Crop and Climate Sciences, South Africa Cornelius W van Huyssteen --- Department of Soil, Crop and Climate Sciences, South AfricaHumans organise their environment, including soils. With soil classification the challenge is to consistently differentiate between soils. This study was therefore initiated to summarise selected properties of the prismacutanic B, G, soft plinthic B, and E horizons, described during the... -
Mapping key browse resources in a heterogeneous agricultural landscape
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Clarice P Mudzengi --- , Zimbabwe Amon Murwira --- , Zimbabwe Fadzai M Zengeya --- , Zimbabwe Tinyiko Halimani --- , Zimbabwe Herve Fritz --- , France Chrispen Murungweni --- , ZimbabweWe investigated application of MaxEnt, a one-class classifier, in mapping the spatial distribution of Colophospermum mopane, Dichrostachys cinerea and Salvadora persica using drainage, elevation, slope, soil and Normalised Difference Vegetation Index as environmental variables. Model performance was evaluated based on... -
Structure and norms of the Learning and Study Strategy Inventory: A comparison of South African and American samples
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Ingrid Opperman --- , South Africa Henry D. Mason --- , South AfricaThis study examined the factorial structure and scale values of the Learning and Study Strategies Inventory (LASSI) among a sample of South African university students (N = 6 065). Principal components and confirmatory factor analysis of the data yielded two... -
Towed passive acoustic monitoring complements visual survey methods for Heaviside’s dolphins Cephalorhynchus heavisidii in the Namibian Islands Marine Protected Area
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: T Gridley --- , South Africa MJ Martin --- , South Africa J Slater --- , South Africa J-P Roux --- , Namibia RJ Swift --- , United Kingdom SH Elwen --- , South AfricaThe genus Cephalorhynchus contains four dolphin species, of which three are classified as Near Threatened or Endangered and one subspecies is close to extinction. Understanding the species’ abundance, distributions and habitat preferences is necessary for effective management to prevent further... -
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... -
Potential impact of marine heatwaves on selected phytoplankton adapted to the Gulf of Guinea during stable hydrographic periods
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: E Acheampong --- , Ghana P Mantey --- , Ghana A Weremfo --- , GhanaReports suggest that the Gulf of Guinea (northeastern tropical Atlantic) frequently experiences marine heatwaves (MHW)—prolonged periods of anomalously warm seawater—of ≥1.5 °C above baseline. We assessed the likely impact of this anomaly on two microalgae, Thalassiosira weissflogii (diatom) and Gymnodinium... -
Comparison of the particle size distributions of sediment collected from sandy seafloor using a Van Veen grab and cone dredge
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: GM van der Heever --- , South Africa LJ Atkinson --- , South Africa CEO von der Meden --- , South AfricaSediment particle size is an important environmental parameter that influences benthic species composition and is frequently used in habitat and ecosystem classification systems. In South Africa, benthic grabs are regularly used to collect seafloor sediment samples for particle size analysis... -
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... -
Predicting corporate defaults using machine learning with geometric-lag variables
Item type: Journal Article • Journal: Investment Analysts Journal • Authors: Hyeongjun Kim --- , Korea Hoon Cho --- , Korea Doojin Ryu --- , KoreaThis study examines whether corporate default prediction techniques based on machine learning can achieve better performance by using geometrically declining weighted average values of the time series variables, that is, geometric-lag variables. We test four machine learning algorithms: logistic regression,... -
The role of career wellness in living and studying for South African first-year university students
Item type: Journal Article • Journal: Journal of Psychology in Africa • Authors: Henry D. Mason --- , South Africa Kobus Fourie --- , South AfricaThis study explored the relationship between career wellness, emotional wellness, life satisfaction, and learning and study strategy (LSS) orientation among a sample of 15 458 South African first-year university students. Data were obtained from an institutional repository, including assessments on... -
A reflection on Southern Forests: a Journal of Forest Science using bibliometrics
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: S Grobbelaar --- , South Africa R Oosthuizen --- , South AfricaBibliometrics is used to determine patterns in published research. The aim of this paper is to illustrate the observable bibliometric patterns in the journal Southern Forests: a Journal of Forest Science. Frequency analysis and co-occurrence network analysis were performed to... -
Characterizations of maximal z°-ideals of C(X) and real maximal ideals of q(X)
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Z. Arjmandnezhad --- Shahid Chamran University of ahvaz, Iran F. Azarpanah --- Shahid Chamran University of ahvaz, Iran A.A. Hesari --- Shahid Chamran University of ahvaz, Iran A.R. Salehi --- Petroleum University of Technology, IranIn this paper we first give elementwise characterizations of real maximal ideals and maximal z°-ideals of C(X). Next, using this we characterize the real maximal ideals of the classical ring of quotients q(X) of C(X) and also maximal z°-ideals of... -
Diversity and conservation prioritisation of plant species utilised by communities living in the forest areas managed by the Benin National Timber Office
Item type: Journal Article • Journal: Southern Forests: a Journal of Forest Science • Authors: Sèna Donalde Dolorès Marguerite Déguénon --- University of Abomey-Calavi, Benin Castro Gbêmêmali Hounmenou --- University of Abomey-Calavi, Benin Rodrigue A Idohou --- National University of Agriculture, Benin Brice Tente --- University of Abomey-Calavi, Benin Achille Ephrem Assogbadjo --- University of Abomey-Calavi, Benin Brice Sinsin --- University of Abomey-Calavi, BeninThe diversity of forest resources is threatened in its current form of exploitation by rural communities. In order to contribute to the sustainable use of forest resources, this study aimed to assess the diversity of ‘utilitarian’ plant species (those that... -
Spectrum of female commercial sex work in Bangui, Central African Republic
Item type: Journal Article • Journal: SAHARA-J: Journal of Social Aspects of HIV/AIDS • Authors: Jean De Dieu Longo --- , Central African Republic Marcel Mbéko Simaléko --- , Central African Republic Richard Ngbale --- , Central African Republic Gérard Grésenguet --- , Central African Republic Gilles Brücker --- , , France Laurent Bélec --- , , FranceClassification of professional and non-professional female sex workers (FSWs) into different categories, never previously reported in the Central African Republic (CAR), may be useful to assess the dynamics of the human immunodeficiency virus (HIV) epidemic, design operational intervention programmes to... -
Towards a natural classification of African toads (Anura, Bufonidae): Past progress and future prospects
Item type: Journal Article • Journal: The Journal of the Herpetological Association of Africa • Authors: BarryT. Clarke --- The Natural History Museum, EnglandAfrican bufonid toads (especially members of the genus Bufo) are a relatively uniform group morphologically, but beneath this apparent uniformity lies a higher level of diversity in habits and lifestyle than is initially evident. Members of the group exhibit considerable... -
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... -
The effects of suspended bivalve culture on benthic community structure and sediment fluxes in Saldanha Bay, South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: TA Probyn --- Fisheries and the Environment (DFFE), South Africa M Pretorius --- Fisheries and the Environment (DFFE), South Africa F Daya --- Fisheries and the Environment (DFFE), South Africa A du Randt --- Fisheries and the Environment (DFFE), South Africa A Busby --- Fisheries and the Environment (DFFE), South AfricaThis study provides a follow-up to prior measurements of the impact of mussel Mytilus galloprovincialis farming on benthic macrofauna and biogeochemistry and includes the first measurements of the effect of oyster Crassostrea gigas farming in Saldanha Bay, South Africa. The... -
On dual-classical Krull dimension of rings
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Sayed Malek Javdannezhad --- Shahid Rajaee Teacher Training University, Iran Sayedeh Fatemeh Mousavinasab --- Shahid Chamran University of Ahvaz, Iran Nasrin Shirali --- Shahid Chamran University of Ahvaz, IranAn ideal L of a ring R is said to be strongly hollow (briefly, sh-ideal) if L ⊆ A + B implies that either L ⊆ A or L ⊆ B, for every pair A and B of ideals of... -
The impact of news on South African sovereign bond yields
Item type: Journal Article • Journal: Investment Analysts Journal • Authors: Elizabeth-Ann van der Westhuizen --- University of Pretoria, South Africa Leon Marx Brümmer --- University of Pretoria, South Africa Cornelis Hendrik van Schalkwyk --- University of Pretoria, South AfricaA reverse event study approach was used to investigate how the South African sovereign bond yield curve reacts to headline news. The change in daily yields, calculated as the difference between the natural log of zero-coupon yields on consecutive business... -
Stability analysis of fully dynamic piezoelectric beams with internal fractional delay
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Jianghao Hao --- Shanxi University, P.R. China Jing Yang --- Shanxi University, P.R. ChinaIn this paper, we are interested in the stability analysis of one-dimensional fully dynamic piezoelectric beam systems with internal fractional delay under different feedback controls (boundary and internal). By introducing two new equations to deal with fractional delay, equivalent new... -
Inverse problem of determining the coefficient in a sixth order Boussinesq equation with additional nonlocal integral condition
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: A.S. Farajov --- Azerbaijan State Pedagogical University, Azerbaijan M.J. Huntul --- Jazan University, Saudi Arabia Yashar T. Mehraliyev --- Baku State University, AzerbaijanThe work is devoted to the study of the solvability of the inverse boundary value problem with an unknown time depended coefficient for a sixth-order Boussinesq equation with an additional integral condition of the first kind is investigated. First, the... -
Naming South African frogs and reptiles in nine Indigenous languages
Item type: Journal Article • Journal: African Journal of Herpetology • Authors: Fortunate M Phaka --- African Amphibian Conservation Research Group, Unit for Environmental Sciences and Management, North-West University, South Africa Jean Hugé --- Hasselt University, Centre for Environmental Sciences, Research Group Zoology: Biodiversity and Toxicology, Belgium Fortune Ravhuanzwo --- African Amphibian Conservation Research Group, Unit for Environmental Sciences and Management, North-West University, South Africa Maarten PM Vanhove --- Hasselt University, Centre for Environmental Sciences, Research Group Zoology: Biodiversity and Toxicology, Belgium Louis H du Preez --- African Amphibian Conservation Research Group, Unit for Environmental Sciences and Management, North-West University, South AfricaScientific taxonomy, as a standardised means of communicating about wildlife, might have limited use or relevance for wildlife conservation stakeholders with minimal understanding of scientific names. Indigenous language names can improve species-specific communication with non-expert conservation stakeholders due to their... -
Status of minority languages in South Africa: the case of the exclusion of isiHlubi in schools
Item type: Journal Article • Journal: South African Journal of African Languages • Authors: Rockie Sibanda --- Cultural Studies and Applied Linguistics, University of Johannesburg, South Africa Vuyiswa Mankayi --- Cultural Studies and Applied Linguistics, University of Johannesburg, South AfricaThis study aims to contribute to understanding the complexities surrounding minority languages in South Africa, with isiHlubi serving as a poignant case study. It explores the nuances and complexities inherent in the exclusion of isiHlubi in schools in Kokstad, KwaZulu-Natal... -
Computational analysis of Orientalist discourse in social media: A case study of Twitter
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Qiming Dong --- Universiti Putra Malaysia, Malaysia Shasha Zhang --- Hunan University of Information Technology, People’s Republic of China Megat Al Imran Yasin --- Universiti Putra Malaysia, Malaysia Chow Ow Wei --- Universiti Putra Malaysia, MalaysiaThe paper presents ORIENT-Net as a tool that processes texts in terms of their orientalist views. This is done by the detection and classification of such texts on social media Twitter. An Orientalist view of the East can see the... -
On 2-nilpotent multiplier of Lie superalgebras
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Rudra Narayan Padhan --- Government Autonomous College Rourkela, India Kishor Chandra Pati --- National Institute of Technology, IndiaIn this article, we define the c-nilpotent multiplier of a finite dimensional Lie superalgebra. We characterize the structure of 2-nilpotent multiplier of finite dimensional nilpotent Lie superalgebras whose derived subalgebras have dimension at most one. Then we give an upper... -
On quotient rings of pointfree function rings
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Batsile Tlharesakgosi --- University of South Africa, South Africa Sharon Nyokabi Wamugunda --- University of South Africa, South AfricaLet L be a completely regular frame. Associated with each I ∈ βL are two ideals, MI and OI , of the ring of real-valued continuous functions on a frame L. In this paper, we describe the intersection of all... -
Global solutions for the time-space fractional rotating magnetohydrodynamic equations in Besov spaces
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Jinyi Sun --- College of Mathematics and Statistics, P.R. China Yuanwei Mai --- College of Mathematics and Statistics, P.R. China Yatao Li --- Jiangxi University of Finance and Economics, P.R. ChinaThis paper is devoted to the time-space fractional rotating magnetohydrodynamic equations in Besov spaces. By exploiting the interweaving action of the smoothing effects of the fractional Laplacian dissipation and dispersive effects of the Coriolis force involving with the time-fractional evolution... -
Enhancing medical diagnosis with a machine learning-based symptom checker for health assessment
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: Sita Yadav --- Army Institute of Technology, India Manisha Dudhedia --- Marathwada Mitra Mandal’s College of Engineering Pune, India P. G. Chilveri --- CILPL, India Reena Mahapatra Lenka --- Symbiosis International (Deemed) University, India Radhika Vikas Kulkarni --- Vishwakarma Institute of Technology, India K. Nagaiah --- ICFAI University Raipur Chhattisgarh, IndiaThe growing incidences of chronic illnesses and increased complexity of medical diagnoses point to the desire to have effective, precise, and timely diagnostic instruments to assist medical personnel. The goal of the current study is to develop an ML-based system... -
On the {2}-domination number of rooted product graphs
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: A. Cabrera-Martínez --- Universidad de Córdoba, Spain A. Conchado Peiró --- Universitat Politècnica de València, Spain J.M. Rueda-Vázquez --- Universidad de Córdoba, SpainLet G be a nontrivial graph with vertex set V (G). A function f : V (G) → {0, 1, 2} is called a {2}-dominating function on G if ∑ u ∈NG [v] f(u) ≥ 2 for every v... -
Some scattering and spectral properties of eigenparameter dependent quantum difference equations with matrix value impulsive conditions
Item type: Journal Article • Journal: Quaestiones Mathematicae • Authors: Güher Gülçehre Özbey --- Middle East Technical University, Üniversiteler Mahallesi, Turkey Yelda Aygar --- Ankara University, TurkeyIn this study, we present a problem which consists quantum difference equation with matrix value impulsive conditions and eigenparameter dependent boundary condition. Our examination is based on the concept of main spectral and scattering properties of this problem. We introduce...
