[Yan, Lei; Hong, Kairong] Cent South Univ, Sch Business, Changsha 410083, Peoples R China.
[Chen, Kunqiu] Hunan Univ, Sch Publ Adm, Changsha 410082, Peoples R China.
[Chen, Kunqiu] Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China.
[Chen, Kunqiu] Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100049, Peoples R China.
[Li, Hui] Cent South Univ Forestry & Technol, Sch Econ, Changsha 410083, Peoples R China.