Influencing Factors Analysis of Soil-erosion of Slope Land in Small Watershed of Southwest Karst Area

To study the soil erosion and its influencing factors of hilly slope land in Guizhou Province under different underlying surface conditions,according to the different water and soil loss harnessing measures of the Bijie Stonebridge small basin in southwest Karst area,the 2006-2008 observed rainfall,surface runoff,soil and water erosion observations are used to analyze various soil-water conservation measures as well as the slope length and variation of the amount of surface runoff and soil erosion.The results show that the measure of changing slope land into terrace has the best effect of water and soil loss harnessing;the extreme storm intensity and rainfall amount has obvious role of water and soil loss;erosion modulus under different rainfall amount appears different laws with the variation of slope and slope length.