关键词: 季风常绿阔叶林, 土壤有机碳, 全氮, 空间异质性, 鼎湖山

Abstract: Based on the theory and methodology of landscape ecology，the landscape pattern of the study area(17．6 km )in the downtown of Hefei was analyzed by using the techniques of RS，GPS and GIS．The object was to provide a
comprehensive method to study urban forest structure and its function in environm ental improvement．The results showed that there were 5 major landscape elements，i．e．，building and hard pavement sudace，water，road，
urban forest，and general green 1and in the area The landscape matrix was building and pavement surface，occupied 73．13％ of tota1 1and．Road was the typical corridor element in the city and occupied 6．89％ ．Green 1and
occupied 1 1．44％ ，in which，urban forest patch occupied 9 18％ ．There were 408 urban forest patches ，with an area of 161．16 hm ．The average area of the patch was 0．396 hm ，and the m aximum area was 12 hm ．48％
of urban forest patch was identified as small scale patches with < 500 m of area．and onlY 8．6％ of them was larger than 1 hm ．The number of general green 1and patch was 255，with an area of 39．74 hm2，which account—
ed f0r 2．26％ of 1and area。and its average and maximum area was 0．1558 hm and 3．86 hm ，respectively． There were 147 water patches，with an area of 149．93 hm ，and occupied 8．54％ of lan d，and the average and
maximum area of the patch was 1．02 hm and 16 hm ，respectively．In the study area ，both of the Shannon Weiner landscape diversity index and evenness were 1ow ，only 0．928 and 0．576，res pectively． In addition，the
dominance of urban fores t patch and general green land was 0．39，showing that the two landscape elements had acertain 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 9800m ．and there was 31．69hm of intefior habitat of urban forest in
tota1．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 co uld be em —
ployed to identify urban forest patch，and a scale system of small scale patch of urban forest—middle patch—large patch—extra 1arge patch was build in the paper．Based on this system．the ratio of different scalas 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 hm )of urban fores t patch should be built，and more urban forests should be es tablished in the northeas tern part of the city
in the future．

Key words: monsoon evergreen broadleaf forest, soil organic carbon, total nitrogen, spatial heterogeneity, Dinghushan.