The spatial correlation between soil erosion and the elevation

slope

amplitude and surface roughness is analyzed based on overlay analysis of soil erosion in 2000and DEM with a resolution of 30meters.Results show that the main type of erosion in Wujiang River basin is water erosion.According to the strength

the erosion can be divided into five levels which are minor

slight

moderate

high and extremely-high.The minor and slight levels of erosion are the dominated erosion.The minor andslight levels of erosion appear a single peak with the increasing elevation

while the moderate and the other beyond the moderate show obvious double peaks.The distribution of the moderate and other levels of erosion below it decreases with increasing slope.The ratio of high erosion area to extremely-high increases with the surface rolling at first

and then decreases

with 15°as a threshold.The erosion increases with the amplitude at first and decreases later

with a threshold of 7～16meters.The surface roughness is negatively correlated to soil erosion.The rougher the land surfaces

the lighter the soil erosion.Soil erosion in the karst area is not sensitive to amplitude and surface roughness

while it is largely affected by elevation and slope.