Distribution Features of Rocky Desertification and Land Use in Karst Area-With Special Reference to Yachi Demonstration Base in Bijie Area of Guizhou Province
Yachi demonstration Base in Bijie region,where has a karst plateau hilly environment setting with warm and cold temperature ranges,dry springs and humid summers,was chosen as the study area. Based on Spot 5 (5 m resolution) remotely sensed images,the topographic maps (1∶ 10 000),and the land use map,etc. ,the extent of rocky desertification in this area were interpreted and the incidence of rocky desertification in the different types of land use were investigated quantitatively. It was found that the spatial distribution of different land use types is one of the important factors that lead to different grades of rocky desertification. Shrubs,other forests,low-coverage grassland,mountainous dry land,and unused land contributed a large proportion of the desertified land. In addition to protecting and improving ecological environment,enhancing the productivity of the land and developing the social economy should also be listed as the major objectives in deploying integrated measures for the rocky desertification control.For example,engineering measures like terracing project should be constructed combining with biological measures such as economic trees planting,etc.