作者机构:[1]Department of Geography, Shanghai Normal University, Shanghai 200234, China, [2]Department of Geography, College of Resource and Environmental Science, East China Normal University, Shanghai 200062, China
相关基金:The National Natural Science Foundation of China under contract Nos 40901010 and 40730526; Leading Academic Discipline Project of Shanghai Normal University under contract No. DZL809. The authors wish to thank Ren Jie, Qing Xiaoyi, Cao Hui and Yang Liangqing, for their participation in the field work and laboratory analysis.