Study on the Landscape Pattern of Urban Forest in Urban-rural Ecotone

Based on the aerial colour infrared image in 2006,by using GIS technique and spatial pattern analysis software Fragstats 3.3,the urban forest space landscape pattern of Fengxian District in Shanghai City at patch composition,class level,and landscape level were analyzed.The results showed that within the research area,there were 53 286 patches of urban forest,covering an area of 10 135.6 hm2.64.0% of the patches were small-sized and 57.6% of the total area was made up of large patches.The distribution of urban forest space was not uniform,and the current structure was not reasonable.Economic forest had the largest patch area and the highest assembly degree,while city green space and forest belt space were highly fragmented and distributed separately.The landscape Shannon's diversity index was at intermediate level(7.25),patch types were rich and landscape Shannon's evenness index was high(0.97),and contagion index was 46.46.There is a phenomenon that small-sized urban forest patches controlled the whole space pattern.It was suggested that in Fengxian District,the structure and distribution of urban forest space should be adjusted,and the proportion of medium-sized patches such as city green space should be increased.