RESEARCH DEVELOPMENT AND PROBLEMS OF KARST ROCKY DESERTIFICATION

Karst rocky desertification is a major kind of land desertification.The vulnerability of karst ecosystem determines the sensitivity to damage and the difficulty to restore the karst ecosystem,but there is no intrinsic relation between karst ecosystem vulnerability and the occurrence of karst rocky desertification.Karst rocky desertification is the effect of degradation of the karst ecosystem other than the absolute behaves of vulnerable karst ecosystem.Therefore,the karst rocky desertification should be artificially accelerating rocky desertification,and a kind of man-made desertification,but it is not neglectful of the control of natural conditions over karst ecosystem.The classification of rocky desertification land should indicate the seriousness,the origin of rocky desertification and the influence of geological conditions such as rock type and topography on karst ecological processes.Hence,the authors suggest that land-use patterns,vegetation,rock,soil,topography and rock-desertification degree should be taken as indicators to divide rock desertification land resulting from artificially accelerating rock desertification so as to evaluate the eco-environment value of rocky desertification land correctly.