THE STATUS QUO OF KARST ROCKY DESERTIFICATION AND THE KEY POINTS FOR HARNESSING ROCKY DESERTIFICATION IN YUNNAN PROVINCE

The ecologic and geologic environment is very frail and the rocky desertification is very obvious(the rocky desertification area is 34772.76 km~2)in Yunnan karst area which seriously restrict the sustainable development of local economy.The rocky desertification region is concentrated in several parts and the area and extent get larger and more serious from the north to the south.There is rocky desertification potential in natural geomorphic evolution process.Widespread distributed karst mountain is the material and the local natural geographic environment is fundamental condition to rocky desertification.The main factor of rocky desertification is rapid increase of population,unreasonable exploiting of land and industrial pollution.However,the major factors leading rocky desertification are different in different parts,artificially imposed in some part,but naturally imposed in other part.According to the conditions and causes of rocky desertification,the guiding idea of synthetic harnessing,and the overall program as well as principle of the synthetic harnessing and principle of in line with local conditions are put forth.The aim,the unit and the basic model and engineering measures in the program of synthetic harnessing to rocky desertification are expounded in the paper.