Rangeland Ecology & Management
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Displaying 2401 - 2450 of 2536 results
- Library Collection RecordChanges in vegetation cover over time in arid rangelands can be used to monitor land condition and to identify processes of land degradation. This article describes how a cover index can be derived…Publication Date 1993
- remote sensing
- monitoring
- rangeland condition
- degradation
- soils
- Landsat images
- Africa
- Library Collection RecordRemote sensing data has not been used to its fullest potential for management of natural resources largely because these data are not readily available. Video remote sensing has been proposed as an…Publication Date 1991
- remote sensing
- management
- agriculture
- erosion
- soil moisture
- Africa
- Library Collection RecordNear-infrared and mid-infrared spectroradiometric reflectance variables were studied for estimating grass phytomass production within grass plots fertilized with five rates of nitrogen. Nine…Publication Date 1989
- Africa
- Library Collection RecordThe literature suggests that two different approaches have been applied to problems of rangeland monitoring using MSS data. These are referred to as the near infrared over red ratio which has been…Publication Date 1987
- remote sensing
- rangeland condition
- savanna
- modelling
- Africa
- Library Collection RecordThis paper reviews the current capability of video imagery for rangeland management assessment. Three video systems are described and evaluated: 1) a black-and-white four-band system with visible/…Publication Date 1987
- Africa
- Library Collection RecordThe spectral behavior of an arid, Lehmann lovegrass (Eragrostis lehmanniana), range canopy with varying quantities of live, green grass, senesced, yellow grass, weathered, gray litter, and different…Publication Date 1987
- grasslands
- remote sensing
- plant production
- soils
- rangeland condition
- NDVI values
- Africa
- Library Collection RecordRemote sensing in aridland/rangeland regions has developed to meet the need for low cost management information over large expanses of land. Applications include rangeland management, watershed…Publication Date 1987
- remote sensing
- rangelands
- management
- Africa
- Library Collection RecordLandsat data were simulated for a three-component rangeland scene consisting of grass, brush, and soil to evaluate the effect of soil background reflectance on the sensitivity of ratio and orthogonal…Publication Date 1986
- Landsat images
- rangelands
- soil
- modelling
- Africa
- Library Collection RecordAirborne video imagery was evaluated for assessing phytomass production within grass plots fertilized with five rates of nitrogen. Video imagery was taken with two black-and-white video cameras--one…Publication Date 1986
- Africa
- Library Collection RecordTemporal variation in earth-atmosphere system reflectance in the 0.5-1.1 [mu]m wavehand was determined from Landsat MSS data for an area of and rangeland in south-central New Mexico. Data were…Publication Date 1986
- Africa
- Library Collection RecordHand-held MARK-II radiometric measurements were used to estimate biomass yields and nitrogen (N) content of Alicia grass (Cynodon spp.) plots having five levels of nitrogen fertilization. The…Publication Date 1983
- plant autecology
- plant production
- fertilizer
- rangeland condition
- remote sensing
- Africa
- Library Collection RecordEquus Cave, in Quaternary tufa near Taung in the semiarid woodland of the southern Kalahari, yielded 2.5 m of sediment in which a rich assemblage of bones and coprolites was preserved. The fossils…Publication Date 1987
- palaeobotany
- Africa
- Library Collection RecordPollen spectra from cores of organic spring deposits from the Transvaal provide evidence for the climatic evolution of the province during the last 35,000 yr B.P. or more. The past climatic phases…Publication Date 1982
- palaeobotany
- Africa
- Library Collection RecordThe development of reliable paleoclimatic maps at a global scale requires data at the following three levels of analysis: (1) well-recorded observations of evenly positioned, well-dated geological…Publication Date 1979
- palaeobotany
- palaeoclimate
- Africa
- Library Collection RecordThe dating of the Stone Age sequence in southern Africa has been considerably revised over the last decade, and one of the anomalies which has resulted is that the Middle Stone Age, now dated to…Publication Date 1978
- palaeobotany
- Africa
- Library Collection RecordSediment composition, grain size and clay mineral record of a high-resolution sediment core from the continental slope off Namibia was investigated to gain information on the deposition of…Publication Date 1996
- palaeobotany
- Africa
- Library Collection RecordTrophic structure and composition are examined in two important biotic records, one the Paleogene of Wyoming and Montana, and the other from the Neogene of Pakistan. The Paleogene sequence spans…Publication Date 1995
- palaeobotany
- Africa
- Library Collection RecordThe Pretoria Saltpan is a circular crater 1130 m in diameter and is situated some 40 km N of Pretoria (lat. 25°34'30''/long. 28°04'59''E). A recent tube sampling and…Publication Date 1993
- palaeobotany
- Africa
- Library Collection RecordFirmly based palaeoenvironmental data for southern Africa prior to 40,000 yr B.P. are sparse. The only site which is likely to be able to provide useful information for Isotope Stage 6 is the…Publication Date 1993
- palaeoenvironmental data
- Africa
- Library Collection RecordPolleniferous sediments from southern Africa associated with past warm episodes before the Last Glacial Maximum, are rare. Interpretation of environmental conditions during these phases are…Publication Date 1993
- palaeobotany
- palaeoclimate
- Africa
- Library Collection RecordPollen evidence from two cores recovered from the Mpulungu basin, South lake Tanganyika, reveals a significant pattern of changes in vegetation in relation to climatic fluctuations between 25,000 and…Publication Date 1991
- palaeobotany
- palaeoclimate
- Africa
- Library Collection RecordHyrax middens in relatively dry parts of Africa preserve plant material which includes pollen. The bottoms of two stratified hyrax dung middens from Blydefontein Basin in the Karoo shrubland of South…Publication Date 1990
- palaeobotany
- Africa
- Library Collection RecordPollen-bearing lake, bog, and spring sediments are relatively scarce in many arid and semiarid regions of the world, and few are dateable beyond the 14C range. We have obtained pollen spectra from…Publication Date 1990
- Africa
- Library Collection RecordA review of Late Quaternary palaeoclimatic data derived from several pollen sequences, between ca. 22 and 34°S in Southern Africa, shows a degree of similarity in temperature and moisture variations…Publication Date 1989
- palaeobotany
- palaeoclimate
- Africa
- Library Collection RecordDuring the Late Cainozoic Africa witnessed big changes of a physical and biological nature. The continent was affected by drift, orographic changes, internal rifting and stepwise cooling of world…Publication Date 1986
- palaeoclimate
- palaeoenvironmental data
- Africa
- Library Collection RecordThe Plio-Pleistocene sediments of Olduvai Gorge, Tanzania, are well known for their records of both hominid evolution and the paleoenvironments where these early hominids lived. This paper…Publication Date 1984
- palaeobotany
- Africa
- Library Collection RecordIt was thought for a long time that equatorial regions had remained virtually unchanged at least since the Tertiary period -- it is only from the Late Tertiary that we can talk of the present…Publication Date 1982
- palaeobotany
- Africa
- Library Collection RecordExtensive systems of fixed linear dunes occur in the Kalahari region of southern Africa, from 28°S to 16°30'S. They provide evidence for large-scale expansion of arid climates in the…Publication Date 1981
- palaeobotany
- Africa
- Library Collection RecordAn examination of sediment from piston cores and 3.5-kHz seismic reflection profiles from the northern Cape Basin and southern Angola Basin reveal a contrasting history of depositional processes in…Publication Date 1980
- palaeobotany
- Africa
- Library Collection RecordThis paper presents results of a deforestation experiment carried out with the general circulation model of the Laboratoire de Météorologie Dynamique coupled to the Schématisation des Echanges…Publication Date 1994
- modelling
- land use
- environmental factors
- soils
- soil moisture
- grasslands
- Africa
- Library Collection RecordFour deterministic rainfall-runoff models are briefly described and applied to a small (0.18 km2) grassland catchment in the Eastern Cape Province of South Africa. The models vary in complexity, from…Publication Date 1994
- rainfall
- runoff
- soil erosion
- grasslands
- modelling
- Africa
- Library Collection RecordThe advantages of incorporating variable length time steps into deterministic hydrological models are discussed and a method based on the use of rainfall thresholds to determine appropriate length…Publication Date 1993
- hydrology
- rainfall
- modelling
- grasslands
- Africa
- Library Collection RecordIn this paper, the second part of a two-part series, the performance of a quasi-physically based rainfall-runoff model (QPBRRM) is evaluated for a set of 39 events from a small rangeland catchment (R…Publication Date 1992
- rainfall
- runoff
- rangelands
- soil moisture
- modelling
- ecology
- Africa
- Library Collection RecordThis paper, the first part in a two-part series, is concerned with the interpretation of spatial and temporal variations in soil water content across a small rangeland catchment; two data sets are…Publication Date 1992
- rainfall
- runoff
- rangelands
- soil moisture
- modelling
- Africa
- Library Collection RecordA review is presented of dambo properties and hydrological data relevant to the determination of runoff response. The review focuses upon dambo distribution, topographic location, soil water regime,…Publication Date 1992
- Africa
- Library Collection RecordThe use of hydrologic modeling and simulation in range management has been increasing. Models provide effective and efficient tools for range management and research. As management tools, they are…Publication Date 1990
- Africa
- Library Collection RecordThree algebraic infiltration equations (Kostiakov's, Horton's and Philip's) were examined to determine which one would best fit infiltrometer data collected from a variety of mostly…Publication Date 1976
- rainfall
- rangelands
- hydrology
- Africa
- Library Collection RecordThe prediction of land erosion rates under different types of land use is difficult because of the large number of variables involved. This paper attempts to isolate the most important…Publication Date 1980
- land use
- erosion
- management
- Africa
- Library Collection RecordRecognition of (late) Tertiary shorelines on continental coasts is becoming increasingly common. It is argued that the elevations of such features are central to their approximate dating and the…Publication Date 1984
- palaeobotany
- Africa
- Library Collection RecordThe oxygen isotopic composition of modern soil carbonate is well correlated with the isotopic composition of local meteoric water. The carbon isotopic cycle for CO2 in soils can be described in terms…Publication Date 1984
- carbon dioxide
- climate change
- soils
- palaeoclimate
- palaeoecology
- Africa
- Library Collection RecordAbstract not available.Publication Date 1993
- rangeland
- ecology
- management
- Africa
- Library Collection RecordThe endemic seed plant flora of the north-eastern Transvaal Escarpment (part of the Afromontane Region) is assessed in terms of the region's lithology (mainly rocks of the Transvaal Sequence). A…Publication Date 1993
- grasslands
- endemic species
- taxonomy
- conservation
- Alien invasive species
- Africa
- Library Collection RecordNo abstract availablePublication Date 1991
- revegetation
- rangelands
- ecology
- vegetation dynamics
- Africa
- Library Collection RecordWith the scarcity of extensive, pristine land for new nature reserves it has become increasingly important to reconcile man's activities with nature conservation. Midmar Dam, Natal, South Africa…Publication Date 1991
- invasive plants
- conservation
- Alien invasive species
- invertebrates
- Africa
- Library Collection RecordThe relationships between resource availability and the requirements of ungulate species were approached by assessing the habitat preferences of three ungulate species, namely roan Hippotragus…Publication Date 1990
- Africa
- Library Collection RecordThe past and present distributions of Rudd's lark are reviewed, and recent claims concerning range reduction examined. The species occurs within a geographically and altitudinally restricted…Publication Date 1988
- biodiversity
- grasslands
- birds
- grazing
- land use
- 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 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 RecordWithin the field of conservation there has been increasing concern about the fragmentation and isolation of habitats. Suggestions have been made for the implementation of [`]buffer zones' to…Publication Date 1987
- conservation
- land use
- monitoring
- satellite imagery
- remote sensing
- mapping
- Africa
- Library Collection RecordDistribution trends are reviewed among 1808 plant species known to be in the IUCN Red Data Book categories and which occur in the fynbos and karoo biomes of the Cape Province, South Africa. The field…Publication Date 1987
- taxonomy
- biodiversity
- conservation
- Africa