Analysis of urban forest landscape pattern in Hefei

Abstract

Abstract: Based on the theory and methodology of landscape ecology,the landscape pattern of the study area (17.6 km²) in the downtown of Hefei was analyzed by using the techniques of RS,GPSand GIS. The object was to provide a comprehensive method to study urban forest structure and its function in environmental improvement. The results showed that there were 5 major landscape elements,i.e.,building and hard pavement surface,water,road,urban forest,and general green land in the area. The landscape matrix was building and pavement surface,occupied 73.13% of total land. Road was the typical corridor element in the city and occupied 6.89%. Green land occupied 11.44%,in which,urban forest patch occupied 9.18%. There were 408 urban forest patches,with an area of 161.16 hm². The average area of the patch was 0.396 hm²,and the maximum area was 12 hm². 48% of urban forest patch was identified as small scale patches with <500 m² of area,and only 8.6% of them was larger than1 hm². The number of general green land patch was 255,with an area of 39.74 hm²,which accounted for 2.26% of land area,and its average and maximum area was 0.1558 hm² and 3.86 hm²,respectively. There were 147 water patches, with an area of 149.93 hm²,and occupied 8.54% of land,and the average and maximum area of the patch was 1.02 hm² and 16 hm²,respectively. In the study area,both of the Shannon Weiner landscape diversity index and evenness were low,only 0.928 and 0.576,respectively. In addition,the dominance of urban forest patch and general green land was 0.39,showing that the two landscape elements had a certain influence on the environment of the study area. The concept of interior habitat for forest was introduced in this paper,which was employed to make a scale class system of urban forest patch. The threshold area with interior habitat for urban forest patch was 9800m²,and there was 31.69hm² of interior habitat of urban forest in total,which occupied 19.7% of the total area of urban forest patch. This situation was not favorable for providing more habitats to support species diversity. It's suggested that the concept of interior habitat could be employed to identify urban forest patch,and a scale system of small scale patch of urban forest middle patch large patch extra large patch was build in the paper. Based on this system,the ratio of different scales of urban forest patch in the study area should be 2∶2∶2∶3. The authors also suggested that larger pieces (1.5～3.0 hm²) of urban forest patch should be built,and more urban forests should be established in the northeastern part of the city in the future.

Key words: Urban forest, Landscape element, Scale, Interior habitat, Landscape pattern

CLC Number:

Q149
S718.55

WU Zemin, WU Wenyou, GAO Jian, ZHANG Shaojie . Analysis of urban forest landscape pattern in Hefei[J]. Chinese Journal of Applied Ecology, 2003, (12): 2117-2122.

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