Use of variable fuzzy sets methods for desertification evaluation

Abstract

Many factors affect the desertification and the factors generally are not in the same scope, it also brings about a great difficulty for evaluating desertification. Under global view of system that the variable fuzzy sets method is presented to set up comprehensive evaluating model for desertification degree and transform the qualitative assessment into quantitative one. The method can scientifically and reasonably determine and relative membership functions of disquisitive indexes at level interval that relating to desertification, also it can fully use one's experience and knowledge, qualitative and quantitative information of index system to obtain weights of indexes for operating comprehensive evaluation. The numerical example of the dry and hot valley of Jinsha River has shown that the proposed method is feasible and effective, and it provides a new theory for desertification study.