Progress of research on rocky desertification in South China Karst Mountain

Based on the research on rocky desertification of the previous scholars,the actual state of research on rock desertification in South China Karst Mountain is reviewed in this paper from the concept connotation of rocky desertification,distribution pattern and quality grading,cause analysis and forming process,integrated control and effectiveness evaluation and so on.Consensus for the concept and formation cause of rocky desertification have already been reached,but the classification evaluation grade index of rocky desertification are different with each other,so general investigation method,unite classification index and appraise index system should be build.Although a few fairly good comprehensive models and methods have already been proposed,there is still no mature methods and effects evaluation system for desertification controlling,which affects the revision and improvement for governing measures of rocky desertification seriously.So,it is proposed that the researching works should be enhanced in the following respects: innovating the research methods,keeping the interaction of rocky desertification and human impacts in hand,enhancing the study on the process simulation and controll measures of karst rocky desertification,popularizing and improving comprehensive treatment technique of karst rocky desertification,and paying special attention to use the geo-system science in karst rocky desertification.Furthermore,in the field of the interaction between rocky desertification and human impacts,it is particularly necessary to stress the quantify research for land productivity and bearing capability,to forecast the effects of human economic activity and economy society consequence to establish ecological security monitor and pre-warning information system in karst mountain,to enhance the study on artificial drive mechanism of differential space-time dimension in the future,to distinguish the effects and contribution rates to rock desertification process between natural and human factors respectively,and to build corresponding concept model and mathematic model.