Studies on Change and Social Driving Forces of the Cultivated Land Resource in Lanzhou

Land use and land cover change is one of the most important components and major causes to global environmental changes.The change of cultivated land is the core of regional land use change.Based on the statistical and survey data of Lanzhou city,the trend of cultivated land use and its driving forces from 1992 to 2002 are discussed.Then a quantity study is made on the eight chosen driving forces factors which affect change of cultivated land by using Principal Component Analysis.The result can be generalized as the growth of population and economy and that of land productive force.A linear multiregression model is thus made in the end.