To establish a standard for preventing soil erosion on cultivated land,soil scientists in USA proposed firstly the concept of Soil Loss Tolerance,then the concept has been applied for evaluating soil erosion risk in a watershed or a region.The concept of soil loss tolerance has been widely used over the world as well as in China.As progressing of researches in soil erosion and relevant subjects,particularly,global changes,the appearing of concepts of sustainable development and rivers health,the shortages o...
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