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Production and physiological responses of Italian ryegrass and white clover grown in monocultures and mixed stands
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: L. Gerber J.J. GerberRyegrass and clover, when grown under optimal conditions in mixed stands interact in response to available light energy. With other resources non-limiting, pasture production is determined by the efficiency with which solar radiation is intercepted by canopies and converted into... -
Lines around fragments: effects of fencing on large herbivores
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: RandallB Boone N Thompson HobbsPeople construct fences to delineate land ownership and to control access to land. Fences accomplish several purposes, notable among these are containing livestock or wildlife raised for profit or subsistence, excluding use of vegetation within areas to be conserved and... -
Patchiness in semi‐arid dwarf shrublands: Evidence from satellite‐derived indices for elevated CO2 assimilation rates on a geochemical mound in the Karoo National Park, South Africa
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: A.R. Palmer --- , South Africa F. van der Heyden --- , South AfricaSatellite‐derived vegetation indices were used to identify a geochemical mound of higher active greenness in the Karoo National Park, Beaufort West, South Africa. We determined whether this mound was occupied by plants with higher CO2 assimilation rate. Plant cover on... -
Remote sensing from space—present and future applications in forestry, nature conservation and landscape management
Item type: Journal Article • Journal: The Southern African Forestry Journal • Authors: Christoph Kätsch --- Faculty of Forestry, Fachhochschule Hildesheim/Holzminden, Germany Holger Vogt --- Dipl. Forstwirt Holger Vogt, Faculty of Forestry, South AfricaPast studies have suggested that sound knowledge about the reflectance characteristics of objects could be of great value in understanding the physical, chemical, and the spatial properties of features on our planet. These characteristics can be assessed remotely, and the... -
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... -
Optical chlorophyll measurements as predictors of total nitrogen, nitrogen fractions and in vitro ruminal nitrogen degradability in tropical grass forages
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Martin Hughes --- Department of Food Production, Trinidad and Tobago Victor Mlambo --- Department of Animal Science, South Africa Cicero HO Lallo --- Department of Food Production, Trinidad and Tobago Paul GA Jennings --- MARJEN Consulting Group, JamaicaThis study evaluated whether the FieldScout CM 1000 NDVI and Yara N–Tester models can produce accurate and reliable estimates of nitrogen (N), buffer-soluble nitrogen (BSN), buffer-insoluble nitrogen (BISN), non-protein nitrogen (NPN) and in vitro ruminal nitrogen degradability after 3, 12... -
Validation and downscaling of Advanced Scatterometer (ASCAT) soil moisture using ground measurements in the Western Cape, South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: Jason Moller --- Institute for Water Studies, South Africa Nebo Jovanovic --- Institute for Water Studies, South Africa Cesar L Garcia --- Consejo Nacional de Investigaciones Cientificas y Tecnologicas (CONICET – UCC), Argentina Richard DH Bugan --- CSIR, South Africa Dominic Mazvimavi --- Institute for Water Studies, South AfricaSatellite-based remote sensing of soil water content (SWC) is a promising technology for hydrological applications to overcome large spatiotemporal variabilities of SWC. This study investigated the performance of the Advanced Scatterometer (ASCAT) soil moisture product on METOP satellite (∼12.5 km... -
Long-term changes in land use, land cover and vegetation in the Karoo drylands of South Africa: implications for degradation monitoring
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: M Timm Hoffman --- Department of Biological Sciences, South Africa Andrew Skowno --- South African National Biodiversity Institute, South Africa Wesley Bell --- Department of Biological Sciences, South Africa Samukele Mashele --- Department of Biological Sciences, South AfricaWe used several large data sets at a range of temporal and spatial scales to document the land-use/land-cover change (LULCC) dynamics of the semi-arid Succulent Karoo and Nama-Karoo biomes of South Africa. More than 95% of the Karoo is comprised... -
Accounting for land cover changes and degradation in the Katse and Mohale Dam catchments of the Lesotho highlands
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Jane Turpie --- , South Africa Grant Benn --- , South Africa Mark Thompson --- , South Africa Nigel Barker --- , South AfricaRangeland conditions in the Lesotho highland dam catchment areas is important for local livelihoods and regional water supply. We investigated changes in land cover and condition from 1991 (before construction) to 2013, using Landsat imagery. The Normalised Difference Vegetation Index... -
Use of remotely sensed derived metrics to assess wetland vegetation responses to climate variability-induced drought at the Soetendalsvlei wetland system in the Heuningnes Catchment, Western Cape province, South Africa
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: NC Ndlala --- , South Africa T Dube --- , South AfricaWetland vegetation plays an important role in the environmental functioning of wetlands through the provision of ecosystem services, such as food and critical habitat for organisms that live in or near water resources. The ecosystem services provided by wetland vegetation... -
Population trends of resident and migrant West African bird species monitored over an 18-year period in central Nigeria
Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology • Authors: Joy Akpanta Ishong --- AP Leventis Ornithological Research Institute, Nigeria Joseph K Afrifa --- AP Leventis Ornithological Research Institute, Nigeria Soladoye B Iwajomo --- AP Leventis Ornithological Research Institute, Nigeria Justus P Deikumah --- AP Leventis Ornithological Research Institute, Nigeria Samuel T Ivande --- AP Leventis Ornithological Research Institute, Nigeria Will Cresswell --- AP Leventis Ornithological Research Institute, NigeriaAlmost no systematic monitoring of bird population trends occurs in West Africa, despite rapid human population increase, habitat change, and climate change, making conservation planning problematic. We monitored bird population trends using constant-effort mist netting, in a newly protected area... -
Threshold changes in the production potential of bush clumps along piosphere gradients in arid thicket mosaics
Item type: Journal Article • Journal: African Journal of Range & Forage Science • Authors: Anton Schmidt --- Nelson Mandela University, South Africa Graham Kerley --- Nelson Mandela University, South Africa Munyaradzi Manjoro --- Sol Plaatje University, South AfricaVarious studies have noted threshold changes in vegetation composition and structure and soil physical and chemical properties in the Albany Thicket biome of South Africa. The aim of this study is to assess if these changes to the environment have...