Rangeland Ecology & Management
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Displaying 51 - 100 of 171 results
- Library Collection RecordEffects of extreme livestock pressure on the abundance and distribution of a drought-deciduous shrub Sericocomopsis pallida, and effects of the shrub canopy on microclimate, soil fertility and grass…Publication Date 1989
- livestock
- ecology
- grasslands
- drought
- plant autecology
- plant production
- plant community ecology
- soils
- savanna
- soil nutrients
- Africa
- Library Collection RecordAn effective framework for drought assessment requires a definition of drought severity, a weather-soils database for the relevant region in a geographic information system (GIS), a reliable crop…Publication Date 1998
- drought
- GIS
- modelling
- plant production
- Africa
- Library Collection RecordWe constructed a simple simulation model (SESS) of the dynamics of forage growth and standing crop and cattle production to evaluate the ecological sustainability of management alternatives for…Publication Date 2003
- models
- simulation
- Grazinglands
- rangelands
- Semi-arid zones
- ANP
- sustainability
- range condition
- grazing
- Cattle reproduction
- forage quality
- cattle
- management
- plant production
- animal production
- soils
- rainfall
- rangeland condition
- Africa
- Library Collection RecordThat data from polar orbiting satellites have detected a widespread increase in photosynthetic activity over the last 20 years in the grasslands of the Sahel is justifies investigating its role in…Publication Date 2003
- Light Use Efficiency
- gross primary production
- grasslands
- NDVI
- Sahel
- Carbon cycle
- remote sensing
- plant production
- NDVI values
- modelling
- NOAA
- Africa
- Library Collection RecordThe objective of the present study was to evaluate the digestibility of Albizia harveyi (AH), Delonix elata (DE) and Grewia similis (GS) dried leaves and the effect of feeding the leaf meals on the…Publication Date 1997
- goats
- Hay intake
- Browse leaves
- digestibility
- plant production
- animal nutrition
- animal production
- Africa
- Library Collection RecordThe impact of fire (head and back fires) on the seasonal change in above- and belowground production in grass species, was quantified over two growing seasons (2000/01 and 2001/02) for semi-arid…Publication Date 2005
- fire ecology
- plant production
- soil
- fodder production
- Africa
- Library Collection RecordA three-year study was done to determine herbaceous biomass production and its utilization by herbivores in an arid zone inhabited by a largely nomadic population in northern Kenya. The indicator…Publication Date 1998
- grasses
- forbs
- Dwarf Shrubs
- Offtake
- herbivores
- desertification
- nomads
- plant production
- rangelands
- pastoralism
- grazing
- degradation
- decision support systems
- management
- foraging ecology
- Africa
- Library Collection RecordA study on grasshopper assemblage response to seasonal grazing, rotational grazing, continuous resting and continuous grazing was undertaken in the eastern Karoo, South Africa. Rotationally-grazed…Publication Date 2003
- seasonal grazing
- rotational grazing
- Karoo
- grasshoppers
- South Africa
- plant production
- insects
- grazing
- land use
- rangelands
- biodiversity
- Africa
- Library Collection RecordThere is significant uncertainty about the effects of global change on the vegetation and animal productivity of pasture and rangeland ecosystems. This paper presents a synthesis of progress made…Publication Date 2000
- climate change
- management
- pastures
- rangelands
- Sensitive regions
- synthesis
- animal production
- plant production
- modelling
- carbon dioxide
- socio-economic aspects
- Africa
- Library Collection RecordBiomass production of different ecotypes within three ecological importantgrass species was determined during cultivation under uniform environmental conditions. Results obtained clearly indicate…Publication Date 1995
- adaptability
- ecotypic variation
- leaf biomass
- Poaceae
- semi-aridgrasslands
- grasslands
- plant autecology
- biomass
- rainfall
- plant production
- vegetation dynamics
- rangeland condition
- Africa
- Library Collection RecordSavanna landscapes in the dry communal areas of southern Zimbabwe are highlyspatially heterogeneous. This year-long study explores the responses of cattle to variation in the availability of fodder…Publication Date 1995
- foraging behaviour
- cattle movement
- spatial and temporal hererogeneity
- savanna vegetation
- Zimbabwe
- savanna
- foraging ecology
- cattle
- plant production
- forage quality
- management
- grazing
- policies
- Africa
- Library Collection RecordThis paper describes the development of a model for estimating herbage production from rainfall and evapotranspiration in rangelands and its calibration using a vegetation cover index derived from…Publication Date 1995
- rangelands
- modelling
- herbage production
- grazing
- land degradation
- degradation
- plant production
- rainfall
- remote sensing
- rangeland condition
- Africa
- Library Collection RecordLand deterioration does not occur uniformly over time or over a landscape. The differential use of preferred areas in the landscape results in uneven distribution of animal impact, and periods of…Publication Date 2004
- basal area
- continuous grazing
- patch overgrazing
- patch selection
- rotational grazing
- spatial heterogeneity
- species composition
- degradation
- animal impact
- rainfall
- grazing
- drought
- rangeland condition
- rangelands
- plant production
- Africa
- Library Collection RecordDuring the dormant winter period the semi-arid rangeland areas of South Africa are characterized by unplanned fires, either by lightning or negligence by man. The quantification of the impact of…Publication Date 2004
- Above-ground phytomass production
- basal cover
- Crude Protein Content
- Grass sward recovery
- Head fire
- litter
- rain-use efficiency
- root mass
- fire ecology
- rangelands
- plant production
- vegetation dynamics
- ecosystem ecology
- management
- Africa
- Library Collection RecordThe pressing need to increase food production in the tropics to feed the burgeoning population of the Third World requires that crop yields ha-1 must be increased without prejudicing the resource…Publication Date 1997
- sustainability
- soil nutirents
- plant production
- subsistence agriculture
- Economic Aspects
- Africa
- Library Collection RecordThe amount and quality of inputs into soil organic matter will be altered by both climate and landuse change. The increase in growth of plants caused by increasing CO2 concentration implies not only…Publication Date 1997
- elevated carbon dioxide
- Decomposition
- organic residues
- secondary chemicals
- soil organic carbon
- climate change
- land use
- plant autecology
- carbon dioxide
- modelling
- ecosystem dynamics
- ecosystem ecology
- plant production
- management
- Africa
- Library Collection RecordThe number of tsessebes in Kruger National Park, South Africa, increased during 1977-1985, but declined after 1986. We used tsessebe number and age structure to determine year-to-year variation in…Publication Date 2004
- drought
- population dynamics
- Population model
- rainfall
- plant production
- modelling
- tsessebe
- wildlife
- vegetation dynamics
- Africa
- Library Collection RecordImproved agricultural productivity using conservation farming (CF) systems based on non-inversion tillage methods, have predominantly originated from farming systems in sub-humid to humid regions…Publication Date 2009
- Conservation farming
- Non-inversion tillage
- semi-arid
- Water productivity
- On-farm experiments
- no-till
- management
- agriculture
- plant production
- Africa
- Library Collection RecordSustainable agriculture requires the formation of new humus from the crops. We utilized 13C and 15N signatures of soil organic matter to assess how rapidly wheat/maize cropping contributed to the…Publication Date 2005
- 13C and 15N
- Duration of arable cropping
- Particle-size fractionation
- Alternating C3/C4 vegetation
- SOM turnover
- C model
- Roth-C Model
- Soil Condition
- plant production
- grasslands
- sustainability
- agriculture
- fertilizer
- Africa
- Library Collection RecordDegradation of vegetation and soils in drylands, sometimes called desertification, is thought to be a serious threat to the sustainability of human habitation, but maps of the extent and severity of…Publication Date 2009
- dryland degradation
- desertification
- Communal land
- net primary production (NPP)
- Local NPP scaling (LNS)
- MODIS
- sustainability
- mapping
- degradation
- communal farming
- plant production
- Zimbabwe
- 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 impacts of fire and grazing management on grass nutritional quality in semi-arid savannas may depend on inherent variation in rainfall and soil nutrient status. We examined the effects of grazing…Publication Date 2010
- crude protein
- Grass nutritional quality
- phosphorus
- rainfall
- grazing
- fire ecology
- soil nutrients
- management
- savanna
- forage quality
- plant production
- Northern Cape
- South Africa
- Library Collection RecordEstablishment of seasonal grazing enclosures has become an important rangeland rehabilitation strategy in semi-arid regions. This study assessed the impact of enclosure age and enclosure management…Publication Date 2010
- cover
- degradation
- Private land ownership
- seed mixtures
- standing crop
- Stock control
- rangelands
- rehabilitation
- animal impact
- communal farming
- biodiversity
- commercial agriculture
- plant production
- monitoring
- Kenya
- Africa
- Library Collection RecordThe issue of sustainability and productivity of open communal rangelands compared to fenced rangelands is often subject to controversy. This study investigated differences in soil and grass layer…Publication Date 2010
- game
- livestock
- Lowveld
- overgrazing
- stocking rates
- grazing
- sustainability
- management
- Soil Condition
- commercial agriculture
- communal farming
- rangelands
- vegetation dynamics
- plant production
- soil fertility
- Swaziland
- Africa
- Library Collection RecordThe Kalahari Transect (KT) is an International Geosphere-Biosphere Programme mega-transect designed to examine hydrological and ecological patterns and processes throughout the savannas of southern…Publication Date 2010
- grass biomass
- Kalahari
- phosphorus
- precipitation
- savanna
- rainfall
- ecology
- hydrology
- plant production
- Soil Condition
- fertilizer
- southern 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 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 RecordThe seasonal trend in root mass, root distribution with depth and root/shoot ratios along a degradation gradient were quantified over a 2 year period (2000/01 and 2001/02 growing seasons) for a semi-…Publication Date 2005
- rangeland condition
- rangelands
- water use efficiency
- plant production
- degradation
- Africa
- Library Collection RecordThe short-term (2 years) influence of fire burning with the wind (head fire) and against the wind (back fire) on the productivity (above-ground phytomass and litter) and fire behaviour were…Publication Date 2004
- Above-ground phytomass production
- Back and head fires
- basal cover
- fuel load
- litter
- fire ecology
- rangeland condition
- rangelands
- plant production
- rainfall
- Africa
- Library Collection RecordRemote sensing of grass quantity is important for providing information about the productivity and functioning of rangelands. Existing indices used to estimate grass quantity, such as normalized…Publication Date 2004
- NDVI saturation
- Band depth indices
- Greenhouse experiment
- Continuum removal
- bootstrapping
- remote sensing
- forage quality
- rangeland condition
- grasslands
- plant production
- vegetation dynamics
- NDVI values
- Africa
- Library Collection RecordConservation agriculture is claimed to be a panacea for the problems of poor agricultural productivity and soil degradation in sub-Saharan Africa (SSA). It is actively promoted by international…Publication Date 2009
- No tillage
- Zero-tillage
- soil conservation
- crop residue
- mulch
- soil carbon
- adoption
- agriculture
- plant production
- degradation
- economics
- conservation agriculture
- Sub-Saharan Africa
- Library Collection RecordThe impacts of climate change are expected to be generally detrimental for agriculture in many parts of Africa. Overall, warming and drying may reduce crop yields by 10-20% to 2050, but there are…Publication Date 2009
- Season failure
- Poverty
- Agricultural systems
- Targeting
- climate change
- global warming
- agriculture
- drought
- animal production
- plant production
- livestock
- Sub-Saharan Africa
- Library Collection RecordThe communal areas of the semi-arid (200 mm) winter-rainfall Namaqualand region of South Africa are heavily utilised by a large number of subsistence farmers who keep sheep and goats. For several…Publication Date 2005
- Semi-arid rangeland
- Vegetation Change
- Goat production
- desertification
- sheep
- goats
- stocking rates
- management
- pastoralism
- subsistence agriculture
- plant production
- plant community ecology
- animal production
- Africa
- Library Collection RecordBiological productivity of grazing livestock under semi-arid conditions in northern Kenya is limited by marked seasonal fluctuations in the availability and quality of rangeland resources. With the…Publication Date 2004
- Seasonal breeding
- goats
- productivity
- Pastoral systems
- Northern Kenya
- plant production
- animal production
- agriculture
- management
- Africa
- Library Collection RecordClimate change impacts on agriculture could arguably be most critical for developing countries in tropical regions: their populations rely importantly on agriculture and climate-dependant resources,…Publication Date 2012
- climate change
- agriculture
- impacts
- tropics
- C4 crops
- plant production
- precipitation
- modelling
- subsistence agriculture
- food security
- Africa
- Library Collection RecordUnderstanding changes in hydrological characteristics of rangeland ecosystems with degradation is essential when making rangeland management decisions in arid and semi-arid areas to ensure…Publication Date 2009
- Aboveground phytomass
- rangeland condition
- root distribution
- root mass
- water-use efficiency
- water use efficiency
- degradation
- hydrology
- management
- animal production
- plant production
- South Africa
- Library Collection RecordThe establishment of enclosures has become an important measure to combat land degradation in many of the world's semi-arid rangelands. In view of the increased pressure exerted by this land…Publication Date 2009
- enclosures
- Semi-arid rangeland
- vegetation structure
- soil quality
- rehabilitation
- degradation
- management
- soil
- commercial agriculture
- communal farming
- plant production
- Soil Condition
- biomass
- Kenya
- Africa
- Library Collection RecordAn analysis tool was developed to simulate primary productivity and crop yields for both present and possible future climate conditions. Southern Africa was delineated into 712 relatively homogeneous…Publication Date 1993
- plant production
- agriculture
- climate change
- soil
- vegetation dynamics
- hydrology
- modelling
- GIS
- rainfall
- socio-economic aspects
- policies
- food security
- Africa
- Library Collection RecordThe rangelands of the world are declining in productivity in spite of the introduction of programmes designed to modernise these traditional pastoral systems of livestock production. This paper…Publication Date 1982
- rangelands
- animal production
- plant production
- subsistence agriculture
- traditional knowledge
- Africa
- Library Collection RecordDevelopment and use of crop growth simulation models has increased in the last decades. Most crop growth models require daily weather data as input values. These data are not easy to obtain and…Publication Date 1994
- agriculture
- modelling
- plant production
- data analysis
- climate
- Africa
- Library Collection RecordOne of the major issues in agropastoral development is the relationship of livestock and crop production. Does the introduction of crop cultivation on to productive rangeland deprive livestock of a…Publication Date 1991
- plant production
- animal nutrition
- animal production
- rangeland condition
- rangelands
- drought
- management
- stocking rates
- livestock
- Africa
- Library Collection RecordA conceptual model of the pastoral production system within the arid, winter rainfall shrublands of Western Australia is described. The building blocks of this model are pasture-type models which are…Publication Date 1991
- modelling
- plant production
- animal production
- soils
- pasture management
- Africa
- Library Collection RecordThe SPUR (simulation of production and utilization of rangelands) model was evaluated for use on eastern hill land pastures. The model was calibrated using the first year of soil fertility, weather,…Publication Date 1990
- rangelands
- Soil Condition
- cattle
- modelling
- animal production
- plant production
- Africa
- Library Collection RecordGross energy and crude protein balances of cattle in traditional systems and ranching in eastern Botswana have been estimated. The calculations show that ranching is more productive on a per animal…Publication Date 1986
- cattle
- plant production
- animal production
- subsistence agriculture
- socio-economic aspects
- Africa
- Library Collection RecordA model of kleingrass (Panicum coloratum L.) growth and utilization by steers is presented. The model included stochastic inputs of climatological characteristics, water retention at different soil…Publication Date 1984
- modelling
- cattle
- grazing
- grasslands
- animal nutrition
- plant production
- stocking rates
- decision support systems
- Africa
- Library Collection RecordEmpirical evidence indicates that the magnitude of global warming to be expected from the relase of CO2 into the atmosphere by the burning of fossil fuels has been greatly overestimated by scientists…Publication Date 1983
- management
- carbon dioxide
- climate change
- greenhouse gases
- plant production
- grasslands
- global warming
- Africa
- Library Collection RecordThe discussion about rangeland degradation in African pastoral systems has so far largely been based on the conventional theory of [`]carrying capacity'. This paper argues that the carrying…Publication Date 1996
- degradation
- grazing systems
- Rangeland ecosystems
- grazing
- rangeland condition
- rangelands
- subsistence agriculture
- pastoralism
- carrying capacity
- management
- stocking rates
- forage quality
- plant production
- policies
- Africa
- Library Collection RecordThe role of empiricism in predicting mean annual primary production at the mesoscale is demonstrated through development of a simple model (RESAP) for application over all land surfaces within a…Publication Date 1993
- savanna
- modelling
- plant production
- mapping
- agriculture
- Africa
- Library Collection RecordA plant growth model has been developed as a component of a general rangeland production and utilization model (SPUR). The carbon and nitrogen content of standing green, live roots, propagules,…Publication Date 1988
- modelling
- rangelands
- animal production
- plant production
- management
- Africa
- Library Collection RecordAn extensive sensitivity analysis of a model for the Simulation of Production and Utilization on Rangelands (SPUR) was conducted. A perturb and observe approach was employed in a series of fractional…Publication Date 1985
- grasslands
- animal production
- animal nutrition
- plant production
- soil moisture
- grazing
- Soil Condition
- stocking rates
- Africa