Study on ecological fragility of wetlands in Sanjiang Plain

As the largest inland freshwater wetlands in China. Sanjiang Plain plays an important role in environmental protection from local scale to global scale. However, due to the fragility of the wetland ecosystems and the environmental disturbances on them caused by natural disasters and human activities, loss and degeneration of wetlands in this area are considerable. Characteristics and reasons of wetlands' ecological fragility in Sanjiang Plain are analyzed and then the evaluation method and index system on ecological fragility of wetlands in Sanjiang Plain are presented. The result of the evaluation shows that the wetlands' ecological fragility in Sanjiang Plain is serious. The value of this method and index system is also discussed in the paper.