Dynamic change of Hefei urban forest pattern
Using RS and GIS,Hefei Landsat TM imagery of 1989,1995,2003 and 2007,we analyzed the change of landscape layout.The results indicated that the urban forest decreased from 5532.66 hm2 to 4218.12 hm2 in the period of 1989-2007.The number of urban forest patch,the patch density,the patch size index,and the edge density increased,indicating that the size of urban forest patch was more irregular and complex.During the 18 years,the patch density increased and the cohesion index decreased,indicating urban forest pattern became dispersed and distributed by human beings.The urban forest construction in the future should increase urban forest patch in the centre district of Hefei.