Rangeland Ecology & Management
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- Library Collection RecordIdentification of the factors that determine the variation in browse quality, as determined by their chemical composition, is an important step towards understanding herbivore distribution patterns.…Publication Date 2006
- nitrogen
- phosphorus
- Condensed tannin
- Polyphenol
- Colophospermum mopane
- fire
- savanna
- foliage
- Ecosystem drivers
- forage quality
- diet selection
- soils
- Africa
- Library Collection RecordIn semiarid savannas of Southern Africa current land use practices and climate change may lead to substantial changes of vegetation structure in the near future, however uncertainty remains about the…Publication Date 2006
- Acacia erioloba
- Bush encroachment
- global change
- Grewia flava
- overgrazing
- seed dispersal
- shrub encroachment
- Southern Kalahari
- Spatial-explicit simulation model
- savanna
- land use
- grazing
- climate change
- vegetation dynamics
- cattle
- ecosystem ecology
- ecosystem dynamics
- rainfall
- fire ecology
- modelling
- conservation
- management
- carrying capacity
- biodiversity
- indigenous encroaching species
- Africa
- Library Collection RecordPastoral communities in East Africa are facing considerable challenges arising from shifts in land tenure policy from communal to individual landholdings and high human population growth rates. Over…Publication Date 2006
- savanna
- Household model
- Kajiado District
- Subdivision
- policies
- communal farming
- pastoralism
- socio-economic aspects
- household income studies
- modelling
- ecosystem dynamics
- food security
- land use
- land reform
- Africa
- Library Collection RecordLarge herbivores can both positively and negatively affect primary productivity and rates of nutrient cycling in different ecosystems. Positive effects of grazers in grasslands have been attributed…Publication Date 2006
- livestock
- soil fertility
- rainfall
- ecosystem processes
- savanna
- productivity
- soil fertility
- cattle
- migration
- Africa
- Library Collection RecordThe effects of fire and mechanical clearing were investigated for their potential in assisting with the eradication of Chromolaena odorata (previously Eupatorium odoratum). The study was divided into…Publication Date 2006
- Alien invasive species
- fire
- management
- restoration ecology
- drought
- savanna
- grassland
- southern Africa
- Library Collection RecordSummary in English and Afrikaans. Also issued on CD-ROM.Publication Date 2006
- savanna
- ecology
- restoration ecology
- Alien invasive species
- management
- South Africa
- southern Africa
- Library Collection RecordAbstract A modeling framework has been developed to examine the spatial and temporal aspects of biomass burning emissions from southern African savanna fires. The complexity of the fire emissions…Publication Date 2005
- African savannas
- biomass burning
- oxygenated volatile organic compounds
- seasonal trace gas emissions
- Sensitivity analysis
- savanna
- fire
- remote sensing
- fire ecology
- carbon dioxide
- Africa
- Library Collection RecordWooded rangelands are a vast grazing land resource globally, including shrublands, savannas and forested ranges. They generally provide forage year-round for small ruminants and they are vitally…Publication Date 2005
- diet selection
- Physical and chemical plant defences
- anti-quality
- grazing behaviour
- grazing
- rangelands
- savanna
- goats
- sheep
- foraging ecology
- livestock
- forage quality
- Africa
- Library Collection RecordFire is a prominent disturbance factor and a major force of environmental change especially in the African savannas. The development of an accurate system to map and monitor fires on the African…Publication Date 2005
- Savanna fires
- Low-resolution bias
- Burned-area mapping
- Seasonal-mosaic
- Africa
- savanna
- fire
- remote sensing
- mapping
- Africa
- Library Collection RecordThe remote sensing of fire severity is a noted goal in studies of forest and grassland wildfires. Experiments were conducted to discover and evaluate potential relationships between the…Publication Date 2005
- Fire severity
- savannah
- Surface reflectance
- Char
- nitrogen
- carbon
- Burn severity index
- Linear and non-linear spectral unmixing
- Elemental emission factor
- savanna
- fire ecology
- GIS
- remote sensing
- grasslands
- modelling
- Africa
- Library Collection RecordAnthropogenic fires in Africa are an ancient form of environmental disturbance, which probably have shaped the savanna vegetation more than any other human induced disturbance. Despite anthropogenic…Publication Date 2005
- Anthropogenic fires
- Bush encroachment
- Indigenous knowledge of herders
- fire history
- Namibia
- savanna
- Scale dependence
- species richness
- vegetation trends
- fire ecology
- disturbance
- management
- vegetation dynamics
- landscape ecology
- Africa
- Library Collection RecordSavanna water management is predicated on the hypothesis that surface water availability can be manipulated at scales that influence herbivore distributions. Using a case study in the Kruger National…Publication Date 2005
- water management
- wildlife management
- Semi-arid savannas
- Artificial water sources
- Water source heterogeneity
- rainfall
- Kruger National Park
- savanna
- national parks
- management
- Africa
- Library Collection RecordComparative field studies were conducted on Acacia tortilis (Forsk.) Hyne and Acacia xanthophloea Benth. trees growing in a semi-arid environment in Kibwezi, Kenya, to assess root access to soil…Publication Date 2005
- Acacia
- [delta]13C
- Hydraulic conductance
- savanna
- soil water content
- stomatal conductance
- transpiration
- soil moisture
- plant production
- plant autecology
- drought
- Africa
- Library Collection RecordTransformation of South African succulent thicket in response to grazing is widespread and characterized by the extensive replacement of dense closed-canopy thicket with a [`]pseudo-savanna' of…Publication Date 2005
- desertification
- functional diversity
- Goat browsing
- plant diversity
- grazing
- savanna
- Aerial Photographs
- ecosystem dynamics
- degradation
- Africa
- Library Collection RecordResearch was conducted to investigate rapid chemical responses of Acacia karroo to severe defoliation in a semi-arid, subtropical savanna. A flock of 250 goats reduced available foliage by 87% in a…Publication Date 2005
- alkaloids
- browse
- goats
- Induced responses
- nitrogen
- tannins
- savanna
- foraging ecology
- plant autecology
- Africa
- Library Collection RecordThe study was conducted in a semi-arid savanna of South Africa, dominated by an almost pure stand of Acacia mellifera subsp. detinens (Black Thorn). Due to its invasive habits and suppression of the…Publication Date 2005
- Bush encroachment
- Canopied subhabitat
- soil nutrients
- Uncanopied subhabitat
- savanna
- management
- indigenous encroaching species
- plant production
- Africa
- Library Collection RecordIn evolutionary time frames, grazing by domesticated livestock on the short grass plains of East Africa is a new occurrence resulting in increased animal densities year around and modification to…Publication Date 2005
- evolutionary history of grazing
- Modified-Whittaker plots
- Serengeti ecosystem
- East Africa
- seasonal grazing
- rangelands
- savanna
- grazing
- biodiversity
- vegetation dynamics
- management
- livestock
- animal impact
- Africa
- Library Collection RecordThe Blantyre City Area is part of the African savanna in southern Malawi. Sedimentological, geomorphological, chemical and mineralogical studies were conducted to create a lithofacies terrain model.…Publication Date 2005
- Applied geomorphology
- Sedimentology
- savanna
- environment
- Cenozoic
- Malawi
- palaeobotany
- Africa
- Library Collection RecordThe influence of Colophospermum mopane (Kirk ex Benth.) Kirk ex J. Leonard on surface soil properties and understorey vegetation was investigated in a semi-arid southern African savanna in Bulawayo,…Publication Date 2005
- mopane
- Understorey vegetation
- Surface soil properties
- soil erosion
- soil nutrients
- Herbaceous species richness
- savanna
- Soil Condition
- biodiversity
- ecosystem dynamics
- ecosystem ecology
- soil fertility
- Africa
- Library Collection RecordHabitat degradation through over-grazing and wood collection is especially prevalent in developing countries such as South Africa. As human populations expand and the demand for land increases, the…Publication Date 2005
- Lizards
- ecosystems
- disturbance
- reptiles
- biodiversity
- human impact
- savanna
- Traditional medicine
- South Africa
- degradation
- conservation
- land use
- species richness
- vegetation dynamics
- Africa
- Library Collection RecordSavanna grass cover is dynamic and its annual extent resonates with wet season rainfall, as shown by satellite observations of normalized difference vegetation index (NDVI) time series for the…Publication Date 2005
- savanna
- precipitation
- Satellite
- NDVI
- grass
- ecohydrology
- rainfall
- NDVI values
- vegetation dynamics
- soil moisture
- modelling
- grasslands
- Africa
- Library Collection RecordAbstract. Shrub encroachment, i.e. the increase in woody plant cover, is a major concern for livestock farming in southern Kalahari savannas. We developed a grid-based computer model simulating the…Publication Date 2004
- Acacia erioloba
- browsing
- Bush encroachment
- Savanna dynamics
- shrub invasion
- Spatial-explicit simulation model
- indigenous encroaching species
- modelling
- rangelands
- livestock
- savanna
- cattle
- fire ecology
- shrub encroachment
- stocking rates
- Africa
- Library Collection RecordA thorough understanding of the role of microbes in C cycling in relation to fire is important for estimation of C emissions and for development of guidelines for sustainable management of dry…Publication Date 2004
- C isotopes
- C sequestration
- CO2 flux
- Dry and rainy season
- fire effects
- Microbial biomass C
- savanna
- Substrate-induced respiration
- carbon dioxide
- carbon dynamics
- fire
- management
- soils
- grasslands
- ecosystem ecology
- Africa
- Library Collection RecordA new integrated approach, involving continuum-removed absorption features, the red edge position and neural networks, is developed and applied to map grass nitrogen concentration in an African…Publication Date 2004
- Hymap imagery
- Absorption features
- Continuum removal
- red edge position
- Foliar nitrogen concentration
- Savanna rangelands
- savanna
- rangelands
- mapping
- plant production
- grasslands
- forage quality
- remote sensing
- conservation
- national parks
- Africa
- Library Collection RecordThe remote sensing of pasture quality as determined by nitrogen, phosphorous, potassium, calcium and magnesium concentration is critical for a better understanding of wildlife and livestock feeding…Publication Date 2004
- Field spectra
- Absorption features
- bootstrapping
- Continuum removal
- Savanna rangelands
- remote sensing
- forage quality
- management
- savanna
- rangeland condition
- Africa
- Library Collection RecordThe lack of information on the vegetation status before the use of fire as a management tool in protected areas leads to drastic destruction of the natural vegetation and biodiversity. This paper…Publication Date 2004
- fire risk
- savanna
- LANDSAT-ETM
- Tasseled Cap
- simulation
- national park
- Senegal
- fire
- hazard assessment
- management
- national parks
- modelling
- remote sensing
- Africa
- Library Collection RecordThis paper set out to analyse time-series and spatial livestock data in the arid west of Namibia over a period of 11 years. These were interpreted in the context of rainfall conditions and access to…Publication Date 2004
- carrying capacity
- Central Namib
- desertification
- desert
- Farming system
- Namibia
- range management
- savanna
- Africa
- Library Collection RecordSavannas and grasslands in South Africa are adapted to fire, yet long-term effects of fire on soil, water and nutrients remain largely unknown. To determine whether frequent burning increases the…Publication Date 2004
- Soil crusting
- infiltration
- fire
- Clay dispersion
- fire ecology
- Soil Condition
- savanna
- grasslands
- soil moisture
- soil nutrients
- Africa
- Library Collection RecordNon-equilibrium processes in savannas are poorly understood because little data is available on how tree abundance has changed over long periods of time. Here I analyse fossil pollen and charcoal…Publication Date 2004
- pollen
- charcoal
- Cyclical
- Phase and transition
- stochastic
- Fourier analysis
- savanna
- plant autecology
- palaeobotany
- Africa
- Library Collection RecordRecent attempts to streamline the identification of areas requiring immediate conservation attention have resulted in the development of prioritisation procedures that identify areas of biodiversity…Publication Date 2004
- biodiversity
- conservation
- Land cover change
- Land use suitability
- land use
- savanna
- management
- decision support systems
- Africa
- Library Collection RecordAbstract Fire is a key ecological process in several biomes worldwide. Although many conservation agencies have the protection of biodiversity as at least one of their major goals, information on the…Publication Date 2003
- Conservation management
- experimental design
- Fynbos
- grassland
- savanna
- fire ecology
- conservation
- management
- Africa
- Library Collection RecordAbstract Aims To identify approaches to improve our understanding of, and predictive capability for, mixed tree–grass systems. Elucidation of the interactions, dynamics and determinants, and…Publication Date 2003
- Coexistence
- competition
- facilitation
- modelling
- primary production
- savanna
- shrubland
- grasslands
- rangelands
- tree–grass ratios
- ecosystem dynamics
- management
- Africa
- Library Collection RecordSummary * 1The success of large-scale cattle ranching in African savanna vegetation has often been limited by problems of bush encroachment and disease (in particular trypanosomiasis spread by tsetse…Publication Date 2003
- Bush encroachment
- East Africa
- grazing patterns
- Landsat TM
- remote sensing
- Vegetation classification
- indigenous encroaching species
- shrub encroachment
- cattle
- savanna
- commercial agriculture
- vegetation dynamics
- grazing
- mapping
- Landsat images
- Economic Aspects
- Africa
- Library Collection RecordThe distribution and abundance of trees can be strongly affected by disturbance such as fire. In mixed tree/grass ecosystems, recurrent grass-fuelled fires can strongly suppress tree saplings and…Publication Date 2003
- C4 grass
- fire
- low CO2
- palaeoecology
- savanna
- Africa
- Library Collection RecordThis paper provides an analysis of the ecological ideas which underpin policies of elephant management and ivory trading in African elephant range states. Increasingly, the discussion surrounding the…Publication Date 2003
- Elephants
- culling
- Ivory
- CITES
- savanna
- non-equilibrium
- animal production
- ecology
- economics
- management
- Africa
- Library Collection RecordAlthough goats are common domestic browsers in African savannas, factors that affect their diet selection and food intake rate are poorly understood. This study used a cafeteria-style experimental…Publication Date 2003
- Boer goat
- Browse preference
- Nguni goat
- optimal foraging
- savanna
- Shoot morphology
- goats
- fodder quality
- foraging ecology
- Africa
- Library Collection RecordNguni goats and Boer goats, which are farmed together in the savannas of the Eastern Cape Province, depend on the same feed resources. The feeding height intake rates and preferences of one of their…Publication Date 2003
- Boer goats
- Nguni goats
- browse
- feeding level
- savanna
- goats
- forage quality
- foraging ecology
- Africa
- Library Collection RecordEast Africa contains areas with some of the greatest large mammal biodiversity on the planet. These areas are key natural resources for the economic development of the region. They are also key areas…Publication Date 2003
- Agro-pastoralism
- savanna
- simulation
- Dietary energy
- cash flow
- Ngorongoro Conservation Area
- pastoralism
- cattle
- game farming
- biodiversity
- socio-economic aspects
- ecosystem dynamics
- modelling
- household income studies
- Africa
- Library Collection RecordFires in African savannas produce emissions contributing to changes in global biogeochemical processes. In the Southern African Regional Science Initiative (SAFARI-2000), fuels characteristics were…Publication Date 2003
- Kalahari
- biomass
- moisture content
- fire intensity
- rate of spread
- flame length
- emissions
- fire
- savanna
- grasslands
- greenhouse gases
- Africa
- Library Collection RecordCyanobacterial soil crusts may be important in arid and semi-arid ecosystems because of their ability to fix atmospheric nitrogen (N2). These crusts are very sensitive to trampling by animals, and…Publication Date 2003
- soil crusts
- N fixation
- Kalahari
- acetylene reduction
- isotopes
- savanna
- soils
- ecosystem ecology
- Africa
- Library Collection RecordA distinguishing, co-dominance feature of trees and grasses in Savannas was prominently explained by Walter. He hypothesized that water is the limiting factor and grasses are superior competitors for…Publication Date 2003
- trees
- grasses
- roots
- savanna
- isotopic
- carbon
- hydrology
- plant autecology
- ecology
- Africa
- Library Collection RecordWe examined relationships between vegetation and soil nutrients along rainfall and land use gradients in the Kalahari. Soil organic carbon (SOC) was significantly lower where reduced rainfall and…Publication Date 2003
- soil organic carbon
- soil organic nitrogen
- rainfall gradient
- land-use gradient
- Kalahari
- savanna
- Botswana
- soil nutrition
- rainfall
- grazing
- grasslands
- land use
- Africa
- Library Collection RecordBiogenic volatile organic carbon (BVOC) emissions are an important component of the global BVOC budget, contributing more than 90%. Emissions vary with species and vegetation type; therefore to…Publication Date 2002
- BVOC
- Isoprene
- monoterpenes
- savanna
- woodlands
- Emission capacities
- seasonal variation
- greenhouse gases
- Africa
- Library Collection RecordSavanna ecosystems are water limited and responsive to rainfall on short time scales, characteristics that can be exploited to estimate fractional cover of trees, grass, and bare soil over large-…Publication Date 2002
- savanna
- ecosystem ecology
- rainfall
- remote sensing
- NDVI values
- soils
- Africa
- Library Collection RecordBush encroachment is a serious environmental and economic problem in Namibia, but little is known about impacts on native reptile diversity. Area-confined visual surveys were used to examine a…Publication Date 2002
- Lizards
- Mabuya
- Pedioplanis
- Lygodactylus
- Bush encroachment
- savanna
- Habitat change
- Namibia
- Africa
- biodiversity
- indigenous encroaching species
- reptiles
- ecosystem ecology
- Africa
- Library Collection RecordSummary The savanna biome is diverse, including formations ranging from almost treeless grasslands to more or less closed-canopy woodlands with considerable variation in plant composition, biomass,…Publication Date 2001
- savanna
- animal production
- plant production
- plant community ecology
- land use
- degradation
- agriculture
- ecology
- southern Africa
- Library Collection Record
197 Grasslands
Vegetation dominated by grasses, which is among the largest ecosystems in the world, has great environmental significance as well as providing feed for livestock and wildlife. Grassland types vary…Publication Date 2001- savannah
- steppe
- grasses
- herbivory
- grazing
- fire
- savanna
- grasslands
- disturbance
- livestock
- southern Africa
- Library Collection RecordAbstract. South Africa has an important responsibility to global biodiversity conservation, but a largely inadequate conservation area network for addressing this responsibility. This study employs a…Publication Date 2001
- biodiversity
- conservation
- savanna
- grasslands
- land use
- Africa
- Library Collection RecordAim Patterns of species turnover along environmental gradients are better studied than their causes. Competitive interactions, or physiological tolerance are most often cited as determinants of…Publication Date 2001
- savanna
- Acacia
- fire
- herbivory
- gradients
- disturbance ecology
- Africa
- Library Collection RecordAlthough acacias are ecologically and economically important, their demography is poorly known. In part this is because few field experiments have been undertaken. Also, a bewildering diversity of…Publication Date 2001
- plant autecology
- ecology
- fire
- savanna
- Africa