Abstract:

Based on the Comprehensive Planning of Shanghai (1999~2020),the development of Chongming Island should focus on the construction of ecoisland. Keeping the ecosafety of Chongming Island,that is,keeping away from ecorisk is important for the realization of the ecoisland and sustainable development of the island.The location of Chongming Island is very special as it is located at the estuary of the Yangtze River and the Yangtze Delta and lies to the east of the East China Sea.Thus the ecorisk sources are especially complex in Chongming Island.Analyzing the type,origin and character of ecorisk sources in the island is the basis for further assessment of the ecorisk and establishment of prevention countermeasures. About 26 ecorisk sources were differentiated on the analysis of history data and assessment of present status of the island.These ecorisk sources can be divided into natural sources and artificial sources by character,and from the Yangtze River,from circumjacent area,from the sea and from the island itself by origin.Furthermore,how the major ecological risk sources disturbed and influenced the ecosystem was also analyzed.Finally,details of ecostrategies for eliminating the risk sources were provided from multiple respects.

Key words: Chongming Island, ecorisk, ecorisk sources, ecostrategy