Rangeland Ecology & Management
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Displaying 251 - 275 of 275 results
- Library Collection RecordThe gradual decline in the ecological condition of natural pastures as a result of over-utilization and the application of insufficient management decisions, coupled with the detrimental effects of…Publication Date 1997
- ecotype
- Digitaria eriantha
- Poaceae
- reclamation
- restoration
- arid grasslands
- restoration ecology
- rehabilitation
- grasslands
- management
- drought
- plant autecology
- rainfall
- vegetation dynamics
- seeds
- germination
- ecosystem ecology
- Africa
- Library Collection RecordThe arid central dune field of the Namib Desert is characterized by a pronounced rainfall gradient across its west-east, 160 km breadth, and a correlated increase in sand stability and grass…Publication Date 1997
- dune ecology
- fungal diversity
- moisture
- mutualism
- Namib Desert
- Namibia
- pulse-reserve paradigm
- mycorrhiza
- rainfall
- ecosystem dynamics
- 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 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 RecordIn the savanna biome of southern Africa, introduced mesquite species have transformed at least 200,000 ha in the northern Cape Province of South Africa and could have a significant effect on insect…Publication Date 1996
- mesquite
- invasive plant
- Bush encroachment
- Scarabaeidae
- rare species
- savanna
- Alien invasive species
- insects
- management
- ecosystem ecology
- Africa
- Library Collection RecordAlien plants invade many ecosystems worldwide, often having substantial negative effects on ecosystem structure and functioning. The apparent complexity of invasions has impaired the development of a…Publication Date 1996
- biological invasions
- Model comparison
- Plant dispersal
- Alien invasive species
- modelling
- management
- decision support systems
- ecosystem ecology
- Africa
- Library Collection RecordInvasive plants and plantations may be detrimental to native, ground-living, invertebrate fauna. Using pitfall traps at 20 sites in Pietermaritzburg, South Africa, an assessment was made of the…Publication Date 1996
- invertebrates
- native vegetation
- Invasive vegetation
- afforestation
- Alien invasive species
- ecosystem ecology
- Africa
- Library Collection RecordTo test the effects of shade on understorey herbaceous productivity in tropical savannas, water relations of important grass species that either grow primarily under tree crowns or in open grasslands…Publication Date 1995
- Cynodon n1emfuensis
- Digitaria macroblephara
- Eustachyspaspaloides
- irradiance
- Panicum maximum
- rainfall-use efficiency
- stomatal conductance
- Tropical grasses
- water potential
- vegetation dynamics
- ecosystem ecology
- Africa
- Library Collection RecordThe Eastern Cape Subtropical Thicket (ECST) forms the transition between forest, semiarid karroid shrublands, and grassland in the Eastern Cape, South Africa. Undegraded ECST forms an impenetrable,…Publication Date 1995
- rangeland condition
- rangelands
- degradation
- eco - tourism
- grasslands
- ecosystem ecology
- Africa
- Library Collection RecordAspects of the relationships between the plants and the flower-visiting insects of the north-western Cape, South Africa, based upon a 3-year study on permanent plots, are examined. The vast majority…Publication Date 1994
- anthophilous insects
- Apoidea
- Asteraceae
- Bombyliidae
- flower visitation behaviour
- Mesembryanthemaceae
- masarine wasps
- melittophily
- Namaqualand broken veld
- pollen loads
- ecosystem ecology
- insects
- Africa
- Library Collection RecordThis study examines the variability of the normalized difference vegetation index (NDVI) over Bostwana during the period 1982-1987. Its relationship to rainfall is evaluated from 26 stations…Publication Date 1994
- NDVI values
- rainfall
- soils
- savanna
- plant production
- ecosystem ecology
- Africa
- Library Collection RecordIntroduction of mechanized agriculture induces profound changes in soil characteristics. Soil compaction originating from mechanical land clearing, mechanized cultivation, and continuous cropping is…Publication Date 1993
- Soil Condition
- no-till
- management
- rehabilitation
- ecosystem ecology
- Africa
- Library Collection RecordSavanna-grassland ecosystems are highly interactive due to effects among interconnected trophic elements. This can cause disturbance at one level in the trophic web to be propagated through that web…Publication Date 1992
- browsing
- grazing
- rinderpest
- Serengeti
- savanna
- disturbance
- disease
- animal impact
- ecosystem ecology
- Africa
- Library Collection RecordPartitioning available energy between plants and bare soil in sparsely vegetated rangelands will allow hydrologists and others to gain a greater understanding of water use by native vegetation,…Publication Date 1992
- rangelands
- hydrology
- ecosystem ecology
- modelling
- Africa
- Library Collection RecordDisease of domestic animals on rangelands is caused by a wide variety of agents (some infectious and some non-infectious). Disease is primarily a function of the ecosystem, where a shift in the…Publication Date 1992
- livestock
- disease
- rangelands
- ecosystem ecology
- economics
- Africa
- Library Collection RecordNo abstract availablePublication Date 1991
- biodiversity
- ecosystem ecology
- conservation
- South Africa
- Africa
- Library Collection RecordThe two most critical African natural disasters, drought and locust outbreaks, are least understood in terms of the four activities considered essential to long-term disaster reduction: hazard…Publication Date 1991
- drought
- insects
- ecology
- hazard assessment
- ecosystem dynamics
- ecosystem ecology
- Africa
- Library Collection RecordVegetative cover affects the spatial and temporal variability of heat and water in the soil. The ability to predict temperature and water conditions enhances our ability to evaluate management…Publication Date 1991
- modelling
- soils
- ecosystem dynamics
- ecosystem ecology
- Africa
- Library Collection RecordIn South Africa, organized dune stabilization began in 1845 in the western Cape with the introduction of Australian Acacia species which were regarded as the most useful plants for this process.…Publication Date 1989
- Alien invasive species
- ecosystem ecology
- economics
- fire
- indigenous species
- landscape ecology
- Africa
- Library Collection RecordThe invasions of introduced species into five reserves in tropical savannas and dry woodlands are described. Vascular plants are the group having the most introduced species; invasions are least…Publication Date 1988
- Alien invasive species
- Nature reserves
- savanna
- ecosystem ecology
- biological control
- insects
- Africa
- Library Collection RecordAbstract The main factors affecting the abundance and composition of the invertebrate fauna in grassland are reviewed. Old grasslands with species-rich swards and complex structure support an…Publication Date 1987
- grasslands
- biodiversity
- soils
- ecosystem ecology
- management
- Pesticides
- Africa
- Library Collection RecordGrassland burning elicits a diverse array of responses by arthropods, depending upon many interactive factors. Empirical models were developed, based on the literature, to qualitatively order…Publication Date 1987
- grasslands
- fire ecology
- insects
- modelling
- ecosystem ecology
- Africa
- Library Collection RecordMany areas of East Africa show signs of misuse of natural resources by man. An improved use of these resources can be made if land use is integrated within the boundaries of a natural ecosystem,…Publication Date 1987
- conservation
- land use
- pastoralism
- agriculture
- ecosystem ecology
- eco - tourism
- socio-economic aspects
- Africa
- Library Collection RecordThe growth and species structure of vegetation in relation to the proximity of termite (M. michaelseni) mounds was studied in a semi-arid savannah ecosystem during 1978-1980. The dry matter yield in…Publication Date 1982
- savanna
- ecosystem ecology
- biodiversity
- soils
- Africa
- Library Collection RecordSummary This paper presents a description of the temporal and spatial distribution of rainfall within the Serengeti Ecosystem, Tanzania. Ecosystem and Regional patterns are discussed with respect to…Publication Date 1975
- rainfall
- ecosystem dynamics
- ecosystem ecology
- vegetation dynamics
- Africa
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