Spatial Distribution of Soil Erosion Intensityin Zhifanggou Small Watershed Based on GIS

Based on calculating factor parameters of soil erosion predication model,spatial distribution map of factor parameters at Zhifangguo Watershed was drawn.By using Geographic Information System(GIS) technology,spatial distribution characteristics were also gotten.In addition,the distribution map of soil erosion intensity in Zhifangguo Watershed was gained too.The results indicated that soil erosion intensity in the upstream of the catchment was more severe than that in the lower stream;severe and extreme severe soil erosion occurred at the upstream.In the middle-stream,slight and moderate erosion intensity happened;soil erosion intensity in the left side of the catchemnt was more than that in the right side.Extreme severe soil erosion area was located at Guaigou,Kuqiaogou,Dafanjiagou,Zhenggou and Daluoguogou,where soil erosion intensity reached to 23000-33000 t/(km2·a).Ephemeral gully erosion was a major factor causing occurrence of extreme severe soil erosion on hillslopes.Soil erosion intensity distribution was dominated by vegetation coverage and slope gradient.