Vegetation Degradation and Restoration Ways of Rock Desertification Land in Karst Mountain Area of Northern Guangdong——Exampled in Yingde,Yangshan,Ruyuan and Lianzhou County(City)

The Karst mountainous area in northern Guangdong province is the main distribution region of rock desertification within the province.The rock desertification has become the main restriction factor for the ecoenvironmental improvement and social economy development.Taking Yingde,Yangshan,Ruyuan and Lianzhou as examples,the desertified land was divided into 4 levels based on the surveyed data,qualitative and quantitative analysis methods.Considering the practical situations of the natural,social and economical developments,contermeasures of vegetation restoration of desertified land with different levels were proposed according to the analysis of current situation,process of vegetation degradation,as well as its influence factors.