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《RESOURCES AND ENUIRONMENT IN THE YANGTZA BASIN》 1999-02
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THE DIAGNOSTIC FEATURES OF DEGRADED ECOSYSTEM AND INDEX SYSTEMS FOR DEGRADATION EVALUATION

Zhang Jiaen(South China Agricultural Uniwrsity, GUangzhou, 510642)Xu Qi(Institute of boil Science, The Chinese Academy of' Sciences, Naming, 210008)  
Degraded ecosystems have basic diagnostic features including simplification of structure anddegeneration of function, decreasing of productivity and biodiversity. Because of differences of regional environment and disturbance of human activities, ecosystem may have different processes,types and stages. The index systems for evaluating degraded ecosystems including soil, vegetation, atmosphere, water body, agroecosystems and regional naturaLhuman complex ecosystemsare put forward in this paper. Soil degradation index system consists of physical, chemical, biological and pollution indices; vegetation degradation can be evaluated by four kind of indices suchas quantity, quality, structure and function of vegetation; air degradation index system includesindices of air composition, pollution and meteorological disasters; the degradation of water resources can be appraised from their quantity and quality; the index system of agroecosystemdegradation includes seven kinds of indices such as productivity, stability, sustainability, biodiversity, equilibrium, openness and quality of products; degradation assessment of PREES systemcan be divided into five sub-systems, each of which is subdivided into several indices.
【Fund】: 国务院三峡建设委员会资助
【CateGory Index】: X826
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