1. Bailey RG (1996) Ecosystem geography. Springer, Berlin Heidelberg New York
2. Chen L, Li F (2000) The soils in the Hexi Corridor. China Environmental Science Press, Beijing
3. Chen L, Qu, Y (1992) Rational development and use of land resources in the Hexi Region. Science Press, Beijing
4. Fan Z (1996) Influences of land development on eco-environment and strategies in Xinjiang. Meteorological Science Press, Beijing
5. Gansu Forestry Survey and Design Institute (1996) The survey report of land desertification in Gansu Province. Gansu Science & Technology Press, Lanzhou