Landform distribution features of soil erosion in Ningqiang county

In order to reveal the spatial distribution features of soil erosion in Ningqiang county, the GIS technology was used to obtain the landform features in the respects of slope degree, slope direction, elevation and rolling degree of soil erosion distribution via overlap of the distribution map of soil erosion intensity in Ningqiang county and the landform element maps extracted from the digital elevation model. The results showed that the degree of soil erosion and water loss in Ningqiang county was 63.79%. The soil erosion intensity was mainly moderate. The distributions of soil erosion area percentage, soil erosion comprehensive index and soil erosion intensity at different slope degree, elevation and rolling degree were assumed as single peak. The soil erosion area percentage of flatland was close to 0. The distributions of soil erosion area percentage, soil erosion comprehensive index and soil erosion intensity at different slope directions were not different dramatically. The maximum and main range of different soil erosion intensity distribution were increased with rise of slope degree, but decreased with rise of elevation. The distributions of soil erosion intensity in different rolling degrees were similar. The results can provide a basis for decision making and theory support for making regional plan of soil and water conservation and treatment of soil erosion and water loss.