Research On The Construction Of Urban Ecological Function Network In Xiamen City

Currently, improving the connection of ecological function network is meaningful to the promotion of the urban ecosystem function and value, and the restriction of urban pattern's speed in urban landscape system. Taking Xiamen as an example and adopting remote sensing (RS) and geographical information system (GIS) technology, this paper makes the map of the landscape type in the researching area. Using factor analysis and the entropy method, the ecological function resistance among all the landscape components in the study area was established. With the assistance of GIS software, the optimal path of corridors in ecological function network was extracted on the basis of the "least cost" modeling and the optimized framework of ecological function network was confirmed by the network structural analysis. On this basis, optimization and construction projects about ecological function network were put forward.The results indicated as follows:(1) Among various landscape pattern metrics, the area and density metrics, proximity and contagion metrics and shape metrics have partial correlation. (2) CA,PD,IJI,MESH,SPLIT,AI,LSI,PARA-MN,PARA-CV,FRAC-AM index and ESV were chosen as the evaluation index system of ecological function resistance in the study area. (3)From analyses of the ecological function network set up hierarchically using the "least cost" modeling, it showed that most urban forest and public green space distribution vary in space. Considered as the ecological stepping-stone in the current urban areas, some urban green space was isolated in both space and function is unable to form effective network coverage. Some ecological function nodes in current urban area have lower quality. Stability of the ecological system is poor and the ecological function flow cannot connect very well.