Evaluation of exploitation suitability of unutilized arable lands in ecologically fragile areas — A case study of Datong City, Shanxi Province THE FRAGILITY OF ECOSYSTEM AND THE RESTORATION OF DEGRADED ECOSYSTEM DESIGN AND MANAGEMENT OF ISLAND MARINE PROTECTED AREAS(IMPA):A THEORETICAL AND CASE STUDY Therapeutic effects of Fufang E’jiao Jiang on renal anemia rats and its mechanisms ECOLOGICAL FRAGILITY OF AND FORESTRY STRATEGIES FOR HEILONGJIANG BASIN A research of Matter-element Model of comprehensive evaluation on fragile eco-environment Research on regionalization of economic types of eco-agriculture in Shanxi Province Ecological fragility of wetlands in Sanjiang Plain Assessing the fragility of ecosystem using artificial neural network model