Study on Land Use Change and Driving Force of Society in Karst Mountainous Region

Under the support of SPSS,based on the data of land use change survey from 2001 to 2007 in Hechi City and the associated economic and social statistics,using system theory analysis of the information entropy principle,the characteristics of land-use change in Hechi City were analyzed.In the last 6 years,the information entropy of change(1.455-1.463) showed that land-use in Hechi City developed to a state of disorder,lower degree of order.With the analysis of the principal component,the social driving factors that affected the farmland change in Hechi City were analyzed.The cumulative contribution of the first principal component rate reached 68.697%,on the table of component matrix,higher factors most concentrated in the per-capita net income of farmers,fixed assets investment,passenger turnover,vegetables sown area and so on.This showed that the structure of industry,traffic level and economical level of Hechi City were the main social driving factors that affected the farmland changes.