[Zhu, Yunqiang; Fu, Qiang; Yang, Fei] Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, State Key Lab Resources & Environm Informat Syst, Beijing 100101, Peoples R China.
[Qiu, Jin Rong; Xu, Zhencheng] South China Inst Environm Sci, Guangzhou 510655, Guangdong, Peoples R China.
[He, Chansheng] Western Michigan Univ, Dept Geog, Kalamazoo, MI 49008 USA.
[Wu, Genyi] Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Hunan, Peoples R China.
[Liu, Qingsong; Fu, Qiang] Henan Univ, Coll Environm & Planning, Kaifeng 475001, Peoples R China.