Abstract:

The rocky desertification has been one of the most serious ecoenvironmental problem in Three Gorges Reservoir area of Chongqing.The study area is the ecological barrier of the Yangtze River basin and one of the global seventeen key region of protecting the biodiversity.The ecoenvironment problems in the study area influence not only the security of Three Gorges Reservoir and steady of migrant,but also the ecological security and the socioeconomy sustainable development of the Yangtze River basin.So many scholars attach importance to the rocky desertification problems in the study area.The research results improve our understanding about the karst rocky desertification problem.At the same time,these researches have also some shortcomings.Based on the principles of karst rocky desertification,three natural factors affecting the sensitivity of karst rocky desertification were chosen as the assessment indices,which were rocky property,slope and vegetation coverage.The assessment map of each factor was finished based on GIS and RS.We also drew integrated assessment map of sensitivity of karst rocky desertification by overlapping function with ArcGIS.Furthermore,we analyzed distribution characteristics and spatial difference of sensitivity of karst rocky desertification in the study area.The results showed that:the area of karst rocky desertification was 17 3765 km2.The strong and extreme sensitivities were the main types of karst rocky desertificatioin sensitivities.The northeast and the south of study area were the most sensitive area and the west and middle was not sensitive.The real karst rocky desertification accorded with karst rocky desertification sensitivity.The natural factors such as rocky property,topography and vegetation were dominant for rocky desertification,and human activities were the inducements of karst rocky desertification.The vegetation was most affected by human activities.Thus,the conservation and renewal of vegetation is the key to prevent karst rocky desertification.