Management of Semi-arid Ecosystems, Volume 7
Brian Harrison Walker
Elsevier Scientific Publishing Company, 1979 - Arid regions - 398 pages
Extensive regions of the world have a climate which, whilst permitting development of a continuous vegetative cover, is too dry for successful annual cropping. These are the semi-arid areas where land use is based on the natural vegetation. Easily degraded and difficult to maintain, they are under increasing pressure as expanding human populations move in and endeavour to force a living from them. As a result they contain some of the worst examples of resource degradation. This book examines the problems and opportunities involved in man's use of semi-arid areas. The authors are all actively involved in research and land management in the areas discussed. Each chapter begins with a detailed, up-to-date account of the ecology of the region (its climate, soils, vegetation, fauna and main ecological characteristics). This is followed by a history of land use, problems involved in its management, a review of current research and recommended land use practices. The common features of semi-arid ecosystems are brought together in a final section.
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Acacia Africa agriculture animals annual areas arid associated Australia caatinga carrying cattle Central changes clearing climate common composition considerable continuous cover crops cultivation density depending dominant drought early East economic effects extensive feeding fire forage forest goats grass grasslands grazing growing growth herbaceous herd higher important improvement increase India intensive irrigation land less limited livestock mainly major mean natural Negev northern occur paddocks particularly pasture period Plains plants population possible present pressure problem production rainfall ranching range rangelands recent reduced region relation relatively resource Rhodesia rotational sand season seed semi-arid semi-arid regions semi-arid savanna semi-desert sheep shrubs soils southern species stocking rate summer supply surface Table temperature tion trees types unit usually utilization vary vegetation West western winter woodland yields zone