[1] Beijing Normal Univ, Sch Nat Resources, Fac Geog Sci, Beijing 100875, Peoples R China
[2] Soochow Univ, Sch Polit & Publ Adm, Suzhou 215123, Peoples R China
[3] Natl Forestry & Grassland Adm, Planning & Design Inst Forest Prod Ind, Beijing 100010, Peoples R China
[4] Chinese Acad Sci, Inst Bot, Beijing 100093, Peoples R China