he natural landscape of loess plateau have been changed by severe soil erosion. The Zi-wuling forest region provides a good study area for tracing back eco-environmental change and natural erosion and man-made accelerated erosion. Using the methods of typical region investigation, experimental study in site,and chemical analysis of samples,impact of forest vegetation destruction and restoration on soil erosion change,characteristics of natural ero-sion under the condition of natural ecological balance,man...