Assessing the fragility of ecosystem has an important role in sustainable ecosystem management. Based on a critical review of current research, we developed an indictor system for assessing the fragility of natural ecosystems, which includes NPP, species biodiversity, community coverage, annual growth of dominant species, surface aridity, and density of soil carbon. These variables affect the structure, function, and habitats of ecosystems. The proposed indicator system classifies the fragility of natural e...