1. Key Lab. of Pollution Processes and Environmental Criteria (Ministry of Education); College of Environmental Science and Engineering, Nankai Univ.; Weijin Road 94 Tianjin 300071 China
2. Key Lab. of Terrestrial Ecological Process; Institute of Applied Ecology; Chinese Academy of Sciences; Shenyang 110016 China
3. Tianjin Economical Technological Development Area (TEDA) Environmental Protection Co. Ltd.; Tianjin 300350 China