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《Acta Geographica Sinica》 2006-01
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Coupling Relationship between Precipitation and Vegetation and the Implications in Erosion on the Loess Plateau, China

XU Jiongxin(Institute of Geographic Sciences and Natural Resources Research, CAS; Key Laboratory of Water Cycle and Related Land Surface Processes, CAS, Beijing 100101, China)  
The relationship among precipitation, vegetation and erosion is an important, unsolved issue in the field of earth surface processes. Based on data from the Loess Plateau of China, some nonlinear relationships between forest cover (Cf), rainfall erosivity (Ir) and annual precipitation (Pm) has been found. A threshold has been identified at Pm = 450 mm, that is, when Pm is smaller than 450 mm, Cf is low and basically does not vary with Pm; when Pm exceeds 450 mm, Cf increases rapidly. Furthermore, two thresholds are identified in the relationship between rainfall erosivity and annual precipitation. When Pm is smaller than 300 mm, Ir is low and basically does not vary with Pm. When Pm exceeds 300 mm, Ir increases rapidly; when Pm becomes larger than 530 mm, the rate at which Ir increases with Pm becomes higher. Based on these nonlinear relationships, the nonlinear picture of variation between erosion intensity and annual precipitation, i.e., the erosion intensity increases with annual precipitation to a peak and then declines, is explained. The implication of these thresholds for erosion control on the Loess Plateau is discussed.
【Fund】: 国家自然科学基金委及水利部联合资助重点项目(50239080);; 国家自然科学基金项目(40271019)~~
【CateGory Index】: S157
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