期刊
JOURNAL OF ARID ENVIRONMENTS
卷 57, 期 3, 页码 381-408出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/S0140-1963(03)00107-1
关键词
degradation; remote sensing; Karoo; NDVI; south Africa; grazing; resilience
Much research has been directed at determining the relative roles of climate and grazing in driving vegetation cover change in semi-arid ecosystems. Recent attempts seek to move beyond this debate as it has stagnated, or reached an impasse. This study follows this pathway in investigating the effect of commercial stock grazing practices on vegetation cover in an eastern Karoo study site in South Africa. The study corrects a 14-year NDVI time-series for precipitation effects. Results suggest that some grazing strategies lead to consistently lower vegetation cover measures than do others, once rainfall is accounted for. Such findings provide a basis for recommendations for more sustainable grazing practices under conditions of variable precipitation. (C) 2003 Elsevier Ltd. All rights reserved.
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