Slope Analysis of Rocky Desertification for the Small Catchments in the Center Plateau of Guizhou Province

Two catchments were selected as the objects of study on homogenous limestone and dolomite area in the center plateau of Guizhou Province.With TM data,the information of slope and rocky desertification were analyzed based on GIS.The result showed that rocky desertification of homogenous limestone region was more serious as a whole.But its intense rocky desertification was less than homogenous dolomite one.In homogenous limestone region light and moderate rocky desertifications focus on 15 to 35 degree slope,while intense rocky desertification focuses on above 25 degree slope.By contrast,the proportion of intense rocky desertification was higher in homogenous limestone region,and there was more hidden trouble in it through the distribution of potential rocky desertification shows.Human influences played an important role in the development of rocky desertification in catchments of homogenous dolomite regions.It was especially true for rocky desertification with a low slope.