Rangeland Ecology & Management
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Displaying 51 - 100 of 176 results
- Library Collection RecordRange revegetation research has been dominated by empirical studies that provide some information about what works or does not work under a given set of conditions, but tell us little or nothing…Publication Date 1991
- revegetation
- rangelands
- Africa
- Library Collection RecordWe present a remote sensing based vegetation mapping technique well suited to a heterogeneous, semi-arid environment. 10 structural vegetation classes were identified and described on the ground.…Publication Date 2000
- remote sensing
- mapping
- Landsat images
- rangelands
- disturbance
- rangeland condition
- Africa
- Library Collection RecordIn spite of a manager's best attempts, a managed rangeland may hit an irreversible state in which it provides neither consumptive nor nonconsumptive services to humans. Therefore, given a…Publication Date 2005
- Irreversible state
- Markov chain
- range management
- uncertainty
- rangelands
- management
- rangeland condition
- modelling
- Africa
- Library Collection RecordThe mediterranean ecosystems of the world harbor exceptional biodiversity, and factors such as livestock grazing which may negatively affect biodiversity are of global concern. The mediterranean…Publication Date 2009
- rangelands
- rangeland condition
- vegetation dynamics
- grazing
- biodiversity
- livestock
- commercial agriculture
- communal farming
- Karoo
- 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 RecordAbstract Aim Wildlife and pastoral peoples have lived side-by-side in the Mara ecosystem of south-western Kenya for at least 2000 years. Recent changes in human population and landuse are…Publication Date 2004
- Kenya
- Maasai Mara
- pastoralism
- rangelands
- bomas
- livestock
- wildlife
- land use
- conservation
- national parks
- tourism
- Economic Aspects
- Africa
- Library Collection Record1. Up to 73% of the world s rangelands are degraded, and increasing demand for meat in developing countries and a growing human population are likely to exert even greater pressures on rangelands in…Publication Date 2010
- restoration ecology
- stocking rates
- grazing
- rangelands
- rainfall
- management
- ecosystem ecology
- vegetation dynamics
- South Africa
- Library Collection RecordRodent-mediated dispersal of Acacia seeds in Kalahari savannah rangelands – implications for bush encroachmentPublication Date 2011
- rodents
- Acacia
- seeds
- savannah
- rangelands
- Bush encroachment
- ecosystem ecology
- Africa
- Library Collection RecordDead shrubs lying on the soil surface in an arid shrubland in the southern Karoo have half-lives of 9 to 18 years depending on wood density which varies among species. Dung pellets of sheep and…Publication Date 1996
- ecosystem ecology
- rangeland condition
- rangelands
- land use
- climate
- vegetation dynamics
- Africa
- Library Collection RecordHierarchical 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…Publication Date 1994
- rangelands
- classification
- savanna
- grasslands
- monitoring
- management
- Africa
- Library Collection RecordSummary In savannas, degrading trends such as increasing woody cover are caused by livestock ranging. Hence, identifying sustainable utilisation intensities is crucial for range management. However,…Publication Date 2000
- ungulate herbivory
- semiarid rangelands
- degradation
- shrub encroachment
- savanna vegetation
- savanna
- sustainability
- management
- rangelands
- vegetation dynamics
- plant production
- animal production
- 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 RecordAbstract not available.Publication Date 2002
- vegetation dynamics
- ecosystem ecology
- rangelands
- grazing
- Africa
- Library Collection RecordRainfall simulation studies on rangeland in the Ntondozi area of Swaziland showed that soil loss decreased exponentially with increasing vegetation cover. Vegetation exerted an important hydrological…Publication Date 1997
- soil erosion
- rangeland
- rainfall simulation
- rangelands
- rangeland condition
- runoff
- ecosystem dynamics
- Africa
- Library Collection RecordGullied and ungullied catchments in four areas of deeply weathered saprolite in the Middle Veld of Swaziland can be successfully separated (p<0.01) using discriminant analysis based on area and…Publication Date 2003
- gully erosion
- thresholds
- discriminant analysis
- Swaziland
- land use
- soil erosion
- rangelands
- vegetation dynamics
- Africa
- Library Collection RecordRangelands are complex systems with many interacting components. Modelling such systems presents two particular and interrelated problems. Firstly, the processes involved operate on greatly differing…Publication Date 1999
- Frame based
- model
- rangelands
- simulation
- modelling
- stocking rates
- grazing
- Africa
- Library Collection RecordWe use a dynamic stochastic simulation model of forage, herbivores, predators and domestic livestock in the Machakos District of Kenya to address policies related to the multiple use of rangeland…Publication Date 1997
- policies
- grazing
- livestock
- land use
- rangelands
- Traditional management
- commercial agriculture
- conservation
- pastoralism
- Forage Quantity
- drought
- 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 RecordThis paper describes an adaptive agent model of rangelands based on concepts of complex adaptive systems. The behavioural and biological processes of pastoralists, regulators, livestock, grass and…Publication Date 2000
- Complex adaptive systems
- ecosystem management
- rangelands
- Adaptive agents
- modelling
- socio-economic aspects
- policies
- management
- Africa
- Library Collection RecordThis paper provides a theoretical analysis of the effects of temporal controls on the stochastic behavior of renewable natural resources such as fisheries and rangelands. First, we show that temporal…Publication Date 2002
- management
- Renewable resource
- Temporal control
- uncertainty
- rangelands
- socio-economic aspects
- Africa
- Library Collection RecordThe USA has about 336 Mha of grazing lands of which rangelands account for 48%. Changes in rangeland soil C can occur in response to a wide range of management and environmental factors. Grazing,…Publication Date 2002
- C sequestration
- rangelands
- grazing
- management
- organic carbon
- soil organic carbon
- fire
- fertilizer
- grasslands
- erosion
- Africa
- Library Collection RecordJohn Acocks' ideas on the recent and future changes of vegetation in South Africa occupy an important conceptual position in the first and subsequent editions of Veld Types of South Africa.…Publication Date 2003
- rangeland condition
- rangelands
- grasslands
- management
- agriculture
- degradation
- vegetation dynamics
- Africa
- Library Collection RecordThere have been several efforts to utilize satellite-based synthetic aperture radar (SAR) measurements to determine surface soil moisture (to 5 cm) conditions of rangeland regions. The results have…Publication Date 2000
- soil moisture
- Synthetic aperture radar
- Semiarid rangeland
- rangeland condition
- rangelands
- remote sensing
- Africa
- Library Collection RecordPolycultural agroecosystems, such as rangelands, are too complex and poorly understood to permit precise numerical simulation. Management decisions that depend on behavioral predictions of such…Publication Date 1996
- Case-based reasoning (CARMA)
- Model-based reasoning
- prediction
- ecosystem
- Reasoning paradigms
- pest management
- rangelands
- ecosystem ecology
- modelling
- ecosystem dynamics
- management
- decision support systems
- Africa
- Library Collection RecordA descriptive study and an experiment were conducted to determine the selectivity of goats Capra hircus) on restricted grazing on a semi-arid temperate rangeland throughout the year. In 1987, a mixed…Publication Date 1992
- diet selection
- goats
- grazing
- rangelands
- Africa
- Library Collection RecordSeveral of the problems associated with grazing animals in extensive settings are related to their uneven patterns of use across the landscape. After fencing, water and salt are two of the most…Publication Date 2001
- Global positioning system
- Activities
- grazing time
- Resting time
- livestock management
- rangelands
- cattle
- grazing
- management
- Africa
- Library Collection RecordLivestock trails frequently evolve in pastures when plant growth or establishment cannot keep pace with vegetation disturbance. In some instances, man-made trails are established in rangeland…Publication Date 2000
- Cattle feeding and nutrition
- rangelands
- Optimum foraging
- Global positioning system
- GPS
- Geographic Information System
- foraging
- grazing behavior
- efficiency
- grazing
- remote sensing
- animal nutrition
- pasture management
- foraging ecology
- 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 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 RecordWith increasing interest in airborne and satellite-based sensors for mapping regional and global energy balance, there is a need to determine the uncertainty involved in aggregating remotely-sensed…Publication Date 1997
- remote sensing
- satellite imagery
- rangelands
- 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 RecordTropical and subtropical rangeland systems provide core ecosystem services for the welfare of human populations that rely on readiness and quality of forage resources. However, forage species are…Publication Date 2014
- Landscape genetics
- Plant population dynamics
- population genetics
- Tropical rangeland systems
- Themeda australis
- rangelands
- Themed atriandra
- ecosystem services
- genetics
- Kenya
- Africa
- Library Collection RecordThe ecology of Seriphium plumosum is not yet fully understood and therefore requires in-depth research to assist with the control of this encroacher plant. The habitat preferences of the plant were…Publication Date 2012
- bankrupt bush
- rangelands
- shrub encroachment
- Seriphium plumosum (Stoebe vulgaris)
- slangbos
- vaalbos
- Thaba Nchu
- South Africa
- Library Collection RecordHerbivores can act as dispersal vectors by purposely or accidentally ingesting ripe fruits, and thus endozoochory is one determining factor for plant distribution patterns. The objective of our study…Publication Date 2010
- Aizoaceae
- germination
- Namaqualand
- Nature conservation management
- rangelands
- Succulent karoo
- management
- conservation
- ecology
- Succulent karoo
- South Africa
- Library Collection RecordVegetation mapping of plant communities at fine spatial scales is increasingly supported by remote sensing technology. However, combining ecological ground truth information and remote sensing…Publication Date 2010
- cluster analysis
- Redundancy analysis
- Multivariate
- Supervised fuzzy c-means
- semiarid
- rangelands
- Namibia
- imaging spectroscopy
- remote sensing
- mapping
- vegetation dynamics
- Namibia
- Africa
- Library Collection RecordThere is a pressing need for an objective, repeatable, systematic and spatially explicit measure of land degradation. In northeastern South Africa (SA), there are large areas of the former homelands…Publication Date 2004
- land degradation
- NDVI values
- rangelands
- South Africa
- degradation
- land use
- remote sensing
- rainfall
- 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 RecordSoil moisture is important information in semiarid rangelands where vegetation growth is heavily dependent on the water availability. Although many studies have been conducted to estimate moisture in…Publication Date 2004
- soil moisture
- TM imagery
- ERS-2 imagery
- rangelands
- remote sensing
- modelling
- NDVI values
- Africa
- Library Collection RecordThe feeding behaviour of Xhosa lop-eared (XLE), Nguni (NGN) and Nguni x Boer crossbred (NBC) goat genotypes was compared in a False Thornveld rangeland by recording time spent on browsing, grazing…Publication Date 2011
- rangelands
- foraging
- goats
- 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 RecordThis paper describes a manual-style Decision Support System that integrates land degradation indicators with adaptive management options and is designed for land managers to easily collect data and…Publication Date 2010
- innovations
- land degradation
- Manual
- monitoring
- participation
- rangelands
- degradation
- decision support systems
- management
- sustainability
- subsistence agriculture
- pastoralism
- Africa
- Library Collection RecordMonitoring cattle inflows and outflows over time is a good indicator of herd productivity. In this study, ninety households were monitored for a year to determine the effect of season, rangeland type…Publication Date 2009
- Cattle sales
- Herd dynamics
- Household consumption
- mortality
- cattle
- Economic Aspects
- rangelands
- animal production
- South Africa
- Library Collection RecordA great many debates have grown up around the notion of desertification as a process of degradation that affects the arid, semi-arid and sub-humid zones of the globe. A fundamental and continuing…Publication Date 2005
- desertification
- Paradigms
- climate
- rangeland ecology
- Livelihoods approach
- environmental policy
- rangelands
- policies
- land use
- ecology
- socio-economic aspects
- Africa
- Library Collection RecordThis paper reviews the predictions and management implications of two current paradigms in the ecology and management of arid and semi-arid rangelands. The equilibrium model stresses the importance…Publication Date 2005
- range condition
- overgrazing
- key resources
- rainfall variability
- heterogeneity
- Scale dependence
- Mobility
- management
- ecology
- rangelands
- modelling
- rangeland condition
- rainfall
- livestock
- stocking rates
- vegetation dynamics
- 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