Abstract:

 The wetland possesses very important environmental function and ecological benefits. Study on the Wetland Nature Reserve along the Yangtze River in Anqing has become a focus of academic community for its well nature.Based on the two phases of Landsat TM images in 1988 and 2006,the landscape patch data of the Wetland Nature Reserve along the Yangtze River in Anqing city was acquired by using the tools of remote sensing and geographical information system.Then it analyzed and explored the dynamic changes of the wetland landscape pattern during the last twenty years with FRAGSTATS software.The results showed that the lake wetland and swamp wetland were the two main landscape types along the Yangtze River in Anqing.The total area of the wetland landscape shrank obviously from 1988 to 2006.The dynamic changes among the different wetland types were very significant.Among all the types of the landscape,the shrinkage of lake wetland was the most outstanding.The degree of the wetland landscape fragmentation was aggravated in the spatial distribution,and the shape of the landscape patch boundary in the study area gradually changed integration,their degree of complexity and abnormity declined.The structure and amount of the landscape types tended towards equilibrium,and the connection degree among different landscape patches showed a decrease tendency.Furthermore,the study found the main driven forces of wetland landscape pattern changes included overpopulation,agriculture development,the government policies,the environmental protection consciousness of the wetland district peasants,and so on.

Key words: landscape pattern/dynamic change/driven force/RS and GIS/wetland along the Yangtze River