| Land desertification assessment is an issue of important theory of land desertification study.The hierarchical analysis model and assessment index system of debris flow region land desertification is firstly raised.Based on analysis of factors, loading to land desertification of the debris flow region in the Xiaojiang valley Yunnan Province, eight factors closely related to the land desertification are chosen to establish a hierarchical analysis model in terms of geomorphology, soil and vegetation.According to the evaluation criteria system land desertification degrees are determined quantitatively with fuzzy evaluation. |