[1] Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China
[2] Chinese Acad Sci, Nanjing Inst Geog & Limnol, Nanjing 210008, Peoples R China
[3] Anhui Agr Univ, Hefei 230036, Peoples R China
[4] Chinese Acad Sci, State Key Lab Synchrotron Radiat, Inst High Energy Phys, Beijing 100039, Peoples R China