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A Study on the Change of Wetland Landscape Pattern in Honghu City by Using 3S Method

In the paper, the TM (ETM ) images of Honghu city in 1991 and 2001 have been interpreted by using 3S method. The patches, area, morphologic feature of different wetlands types have been analyzed. Then, the diversity index, dominance index, evenness index and fragmentation index have been calculated on the basis of landscape ecology theory and method. In addition, by using the wetlands dynamic model and relative change model, the dynamics of wetlands landscape of Honghu city from 1991 to 2001 have been analyzed and quantitative study was carried out. The result showed that the diversity index and fragmentation index had the ascending trend, but the dominance index had the downtrend. The wetlands area had the downtrend and the dynamics degree is -2.11%. Among the different land use/cover kinds in this region, the descending speed of lake is the biggest. The result of the study will guide people protect wetlands and utilize wetlands effectively.