基于水文地貌分类的海滨湿地生态功能评价研究

o realize the spatial difference of ecological function in Yancheng coastal wetland is of great importance in the protection and exploitation of the area. Hydrogeomorphic classification is a prerequisite for ecological function assessment. The primary sources of data were hydrogeomorphic maps about 1980s and imagery information. Spectral data for mapping the distribution of land cover types in yancheng was Alos imagery in 2006-2007. The method of hydrogeomorphic classification to costal wetland is accomplished by dint of spatial analysis of Arcgis9.2 version. Based on the classification, the ecological function indices of wetland were calculated though the value assessment of wetland ecosystem services and function about this zone. Finally, with the rectified traditional estimation model, we can get different hygrogeomorphic units and the spatial distribution characteristics of ecological function in different segments of the coast. The result shows that the ecological function of estuarine fringe(47.09％) is higher than any other unit of coastal wetland. The ecological function index of corrosive coast is as low as 1.27% relatively of the total. However, alluvial coast, as assessed by the same method, was 51.64％ above. A segment of coast which the core area of nature reserve belongs to reaches the maximun ecological function, while it is decreasing gradually toward the north and the south. Especially in the southern part of the mud flat, which just account for 1.47% of all that is as far as the buffer zones should possess. To make a conclusion from the result that the different HGMU hold different ecological function and the spatial difference of ecological function displayed in multi-mudflat which divided up in this paper because of the difference threat of human activity.