[1] Renmin Univ China, Sch Environm & Nat Resources, Beijing 100872, Peoples R China
[2] State Grid Energy Res Inst Co Ltd, Beijing 102209, Peoples R China
[3] Univ British Columbia, Dept Forest Resources Management, Fac Forestry, Vancouver, BC V6T 1Z4, Canada
[4] Nanjing Univ, Sch Environm, State Key Lab Pollut Control & Resources Reuse, Nanjing 210046, Peoples R China