Rangeland Ecology & Management
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Displaying 51 - 100 of 206 results
- Library Collection RecordEstimates of the value of carbon sequestration services provided by a savanna ecosystem and of the value of water for the supply of a number of environmental goods and services are developed in a…Publication Date 2000
- carbon sequestration
- Marginal values
- Water value
- Ecological-economic modeling
- economics
- ecology
- modelling
- grasslands
- land use
- Africa
- Library Collection RecordComputer-based methods of integrated modelling and assessment provide an important means for reviewing policy choices in natural resource management (NRM). Research in support of NRM needs to address…Publication Date 2004
- Integrated modelling and assessment
- Systems framework
- natural resource management
- Participatory research
- modelling
- management
- Africa
- Library Collection RecordThis paper investigates the predictability of the soil erodibility factor (K) in the revised universal soil loss equation from soil clay content (C), the Naperian logarithm of the geometric mean…Publication Date 1997
- water erosion
- soil erodibility
- Revised Universal Soil Loss Equation
- Fuzzy logic
- Fuzzy erodibility
- Erosion prediction
- Erosion uncertainty
- soil erosion
- modelling
- Africa
- Library Collection RecordIn southern African countries soil erosion and the related problems, such as water quality issues or decreasing soil productivity, are the main topics affecting the inhabitants of both rural and…Publication Date 2003
- gully erosion
- Erosion modelling
- Erosion Response Units
- Swaziland
- South Africa
- modelling
- soil erosion
- agriculture
- remote sensing
- Africa
- Library Collection RecordThe influence of soil moisture dynamics on soil carbon and nitrogen cycles is analyzed by coupling an existing stochastic soil moisture model [Adv. Water. Resour. 24 (7) (2001) 707; Proc. R. Soc.…Publication Date 2003
- hydrology
- modelling
- soils
- 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 RecordThe meteorological and agricultural assessment techniques that have been developed in South Africa are discussed, with reference to their strengths and weaknesses, application and suggested future…Publication Date 1998
- drought
- agriculture
- modelling
- remote sensing
- 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 RecordA near real-time crop-specific drought monitoring system that combines crop modelling and a geographical information system (GIS) has been developed in South Africa. The system is intended to provide…Publication Date 1997
- agriculture
- drought
- modelling
- GIS
- decision support systems
- monitoring
- 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 RecordThe development of cropping systems simulation capabilities world-wide combined with easy access to powerful computing has resulted in a plethora of agricultural models and consequently, model…Publication Date 2001
- systems approach
- modelling
- Farmer interactions
- climate
- management
- agriculture
- policies
- decision support systems
- Africa
- Library Collection RecordBiologists are heavily reliant on the characterisation and description of disturbance phenomena and disturbance regimes. This dependency is well illustrated within research on fire recurrence and…Publication Date 1999
- Fire-frequency
- disturbance
- Simulation modelling
- Weibull distribution
- Stochasticity
- fire ecology
- Censoring
- modelling
- 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 metaphysiological modelling approach relates aggregated population dynamics to biomass gained from resources consumed, relative to physiological attrition and mortality losses. A GMM (Growth,…Publication Date 2002
- Consumer-resource dynamics
- Herbivore-vegetation systems
- Metaphysiological modelling
- seasonality
- animal production
- diet selection
- modelling
- ecosystem ecology
- Africa
- Library Collection RecordInteractions between fire regime, dispersal strategies and patch structure were examined as key issues for the management of floristic composition of grasslands, through a model that simulates the…Publication Date 2001
- grasslands
- fire management
- fire frequency
- Dispersal strategies
- colonization
- simulation model
- grassland
- fire ecology
- management
- vegetation dynamics
- biodiversity
- modelling
- seeds
- 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 RecordFocusing on the issue of veldt degradation and grazing pressure on rangelands, a simplified model was constructed for a sustainable stocking rate (SR) evaluation of the complex system of semi-arid…Publication Date 1999
- stocking rates
- mixed grazing
- modelling
- Arid and sub-humid regions
- grazing
- degradation
- management
- decision support systems
- biodiversity
- traditional knowledge
- ecosystem ecology
- conservation
- foraging ecology
- Africa
- Library Collection RecordWe develop a simple, analytical model for canopy resistance to canopy-atmosphere gas exchange that is well suited for incorporation into regional-scale land-surface parameterizations. This model…Publication Date 2000
- canopy
- carbon assimilation
- evapotranspiration
- Light-use efficiency
- ALEX
- modelling
- carbon dioxide
- 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 RecordThe Tool for Exploratory Landscape Scenario Analyses (TELSA) is a spatially explicit model of vegetation succession, natural disturbances, and forest management activities. TELSA is a strategic…Publication Date 2000
- Landscape modeling
- Natural disturbances
- Vegetation succession
- Forest dynamics
- adaptive management
- modelling
- vegetation dynamics
- fire
- management
- grasslands
- 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 RecordThe diminishing wilderness areas remaining in southern Africa offer opportunities to establish and market ecotourism destinations. It would thus be useful to gain insight into what conditions make…Publication Date 2001
- eco-tourism
- economic viability
- local communities
- environmental impacts
- Ongoye Forest
- South Africa
- Economic Aspects
- modelling
- Africa
- Library Collection RecordVegetation community structure is a key indicator of long-term vegetation change in semi-arid ecosystems. This study uses ground-based spectral measurements and a canopy reflectance model to…Publication Date 1998
- Botswana
- Earth observation data
- Kalahari
- semi-arid ecosystems
- vegetation community structure
- monitoring
- vegetation dynamics
- modelling
- grazing
- Africa
- Library Collection RecordDensities of large herbivores within distance annuli around drinking troughsin the Kruger National Park were determined by means of aerial counts. A relationship between herbivore use intensity and…Publication Date 1995
- herbivores
- density
- Watering Point
- Kruger National Park
- modelling
- national parks
- animal impact
- rangeland condition
- 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 RecordThe Integrated System for Plant Dynamics (ISPD) is a comprehensive system in which new and existing data and knowledge are quantitatively or qualitatively used as a basis for range condition and…Publication Date 1995
- Integrated System for Plant Dynamics
- range condition
- grazing capacity
- southern Africa
- Eastern Mixed Bushveld
- grazing
- modelling
- savanna
- rangeland condition
- management
- degradation
- Africa
- Library Collection RecordThe biodiversity convention aims at conserving biodiversity and guaranteeing fair and sustainable human use of biodiversity. The convention further requires that the causes of biodiversity decline…Publication Date 1999
- biodiversity
- climate change
- Earth system modelling
- global change
- Scenarios
- land use
- modelling
- Africa
- Library Collection RecordSpectral matching and linear mixture modeling techniques have been applied to synthetic imagery and AVIRIS SWIR imagery of a semiarid rangeland in order to determine their effectiveness as mapping…Publication Date 1999
- modelling
- remote sensing
- satellite imagery
- management
- Africa
- Library Collection RecordWe present an operational two-source (soil+vegetation) model for evaluating the surface energy balance given measurements of the time rate of change in radiometric surface temperature (TRAD) during…Publication Date 1997
- remote sensing
- modelling
- GIS
- temperature
- surface vegetation
- Africa
- Library Collection RecordInformation from the literature about forage conservation losses in the field has been reviewed, contrasted and analysed in the categories respiratory loss, leaching loss and mechanical loss. An…Publication Date 1989
- forage quality
- conservation
- agriculture
- modelling
- temperature
- rainfall
- 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 RecordWe review various recent approaches to making digital soil maps based on geographic information systems (GIS) data layers, note some commonalities and propose a generic framework for the future. We…Publication Date 2003
- Soil map
- soil survey
- Digital map
- classification tree
- DEM
- DTM
- GAM
- Generalised linear model
- Geophysics
- geostatistics
- GIS
- Neural network
- Pedometrics
- Pedotransfer function
- Regression tree
- remote sensing
- Soil spatial prediction function
- Wavelets
- soils
- modelling
- mapping
- Africa
- Library Collection RecordNomadic larks in the semi-arid Nama-Karoo, South Africa, depend on patches of temporally suitable habitat for breeding. These patches occur where rain has recently fallen, where there has been growth…Publication Date 1998
- semi-arid
- Nomadic birds
- modelling
- Patchy environment
- Stochastic environment
- Protected area design
- biodiversity
- birds
- conservation
- ecosystem ecology
- 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 RecordExpert-based and systematic, algorithm-based approaches to identifying priority areas for conservation are sometimes posited as alternatives. While both approaches have pros and cons, the systematic…Publication Date 2003
- conservation
- modelling
- biodiversity
- management
- Africa
- Library Collection RecordMultivariate analyses and complementarity-based reserve selection algorithms were used as tools for delimiting representative conservation areas in KwaZulu-Natal, South Africa, based on environmental…Publication Date 2001
- birds
- climate
- Conservation area selection
- Pattern and process
- ordination
- spatial autocorrelation
- South Africa
- conservation
- modelling
- land use
- data analysis
- Africa
- Library Collection RecordAn operational procedure is presented that allows detecting active fires based on information from Meteosat-8/SEVIRI over Africa. The procedure takes advantage of the temporal resolution of SEVIRI (…Publication Date 2010
- Fire detection
- Contextual algorithm
- Meteosat8-SEVIRI
- African vegetation fires
- Spatial and temporal distribution of active fires
- fire behaviour
- modelling
- Africa
- Library Collection RecordThe estimation of near surface air temperature (Ta) is useful for a wide range of applications such as agriculture, climate related diseases and climate change studies. Air temperature is commonly…Publication Date 2010
- Land surface temperature
- air temperature
- accuracy assessment
- MODIS
- remote sensing
- modelling
- climate change
- agriculture
- temperature
- disease
- 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 RecordThe remote sensing of Earth surface changes is an active research field aimed at the development of methods and data products needed by scientists, resource managers, and policymakers. Fire is a…Publication Date 2005
- fire
- Fire-affected area
- Burned area
- change detection
- BRDF
- MODIS
- Time series
- remote sensing
- mapping
- modelling
- 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 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 RecordIn arid and semi-arid areas, total evaporation is a major component of the hydrological cycle and seasonal water shortages and drought are common. In these areas, the role of land use and land use…Publication Date 2004
- Green water
- Blue water
- Hydrological model
- land use change
- land use
- management
- non-grazing resources
- rainfall
- hydrology
- modelling
- Africa
- Library Collection RecordExisting projections of the optimal share of carbon sequestration in an overall portfolio of greenhouse-gas mitigation strategies almost all assume the carbon price to be constant over time. This…Publication Date 2005
- climate change
- carbon sequestration
- forestry
- Carbon price
- Integrated assessment models
- greenhouse gases
- Economic Aspects
- modelling
- Africa
- Library Collection RecordMany researchers have used time-series analysis of remotely sensed images to gain understanding of the dynamics of loss of vegetation cover in drylands. However, complex interactions between…Publication Date 2010
- Loss of vegetation
- Mixed-effects
- NDVI
- remote sensing
- modelling
- NDVI values
- vegetation dynamics
- climate
- rainfall
- soils
- land use
- Somalia
- Ethiopia
- 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 RecordFires threaten human lives, property and natural resources in Southern African savannas. Due to warming climate, fire occurrence may increase and fires become more intense. It is crucial, therefore,…Publication Date 2009
- Burned area estimation
- Fire probability
- GLM
- Hierarchical partitioning
- logistic regression
- MODIS fire data
- spatial autocorrelation
- fire ecology
- savanna
- modelling
- climate change
- GIS
- East Caprivi
- Namibia
- Africa
- Library Collection RecordInterpolated rain-gauge data were compared to Meteosat-based precipitation estimates for sub-Saharan Africa. Validation was carried out using a dataset from a very dense gauge network in South Africa…Publication Date 2009
- precipitation
- Block kriging
- Indicator kriging
- Meteosat
- FEWS
- rainfall
- remote sensing
- satellite imagery
- modelling
- runoff
- soil erosion
- Sub-Saharan Africa
- Library Collection RecordTheoretical models predict that the relative importance of facilitation and competition may vary inversely across gradients of abiotic stress. However, these predictions have not been thoroughly…Publication Date 2010
- abiotic stress
- competition
- facilitation
- Herbaceous Species
- Tree
- plant autecology
- biodiversity
- savanna
- rainfall
- modelling
- North Africa
- Library Collection RecordThe need to implement sustainable resource management regimes for semi-arid and arid rangelands is acute as non-adapted grazing strategies lead to irreversible environmental problems such as…Publication Date 2009
- adaptation
- climate change
- Arid rangelands
- Namibia
- Bio-economic simulation approach
- land use
- sustainability
- management
- socio-economic aspects
- grazing
- modelling
- ecology
- savanna
- stocking rates
- decision support systems
- vegetation dynamics
- Namibia
- Africa