CHARACTERISTICS OF KARST ROCKY DESERTIFICATION LAND IN THE SUBTROPICAL ZONE IN CHINA

The degradation land of karst rocky desertification is one of the most serious problems on economic development,eco-system restoration and reconstruction in Southwest China.Karst rocky desertification is a kind of serious land degradation,including social-economical feedback,dynamical feedback and original biology feedback in its degrading processes.Because of the unique eco-system characters and fragilities of karst eco-system,karst rocky desertification land has different land degradation characteristics differentiated from other fragile eco-region as follows:(1) the lithology types difference during the processes of land degradation and restoration;(2) the relativity among land use patterns and land degradation and restoration processes;(3) regional differences and artificial driving mechanism of formation and distribution;(4) the landscape spatial heterogeneity and scale of rocky desertification land;(5) the restoration depend upon soil and topography;(6) the non-renewable ability of soil resources.Karst land rocky desertification is a kind of functional desertification,and its genesis is the fall and decline of eco-system services.So,it is beneficial to probe into the characteristics of karst rocky desertification land for the taming as classifications and ecological restoration and reconstruction of land rocky desertification.