[1] Chongqing Univ, Sch Publ Policy & Adm, Chongqing 400044, Peoples R China
[2] Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China
[3] Chongqing Univ, Sch Publ Policy & Adm, 174A Shazheng Rd, Chongqing 400044, Peoples R China
[4] Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, 11A Datun Rd, Beijing 100101, Peoples R China