Institute of Geographical Sciences and Natural Resources Research Chinese Academy of Sciences Beijing 100101 P. R. China;
Department of Remote Sensing Birla Institute of Technology Ranchi 835215 India;
Sinomaps Press Beijing 100054 P. R. China;
Institute of Agricuhural Resources and Regional Planning Chinese Academy of Agricultural Sciences Beijing 100081 P. R. China;
vegetation; spatial structure; fractal; fractal dimension; China;