An evaluating index system is put forward on the benefits of small watershed comprehensive controls on the Loess Plateau. Taking Zhuanyaogou watershed in northwest of Shanxi province as an example,the multidimensional gray evaluation model is used to evaluate the benefits of comprehensive controlling in 1989,1998 and 2010.The results show that the land area of high gray type and low gray type go up and the middle gray type land area rapidly goes down.
Taking Hequ county in northwest of Shanxi province as an example, we have formulated an evaluating index system for the compositive effect of combating desertification, and have forecasted the compositive effect and the spatial distribution characteristics with multidimensional gray evaluation model for every town of Hequ county in 2010. The 21 towns of Hequ County are regionalized into three types, namely, high effect type, middle effect type and low effect type.
The gray evaluation system consisting of the mathematical models,computer software and hardware were developed,that was able to complete the dimension unity,index forecast,correlation analysis,integration evaluation and diagrams output at one time.