1. Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, People's Republic of China.
2. Graduate University of Chinese Academy of Sciences, Beijing, People's Republic of China.
3. Institute of Applied Ecology, Chinese Academy of Sciences, 72 Wenhua Rd., Shenyang, P.R. China, 110016. Phone: +86-024-83970559; Fax: +86-024-83970367. E-mail: lipejun@iae.ac.cn.
4. Shenyang Key Lab of Environmental Engineering, Shenyang University, People's Republic of China.
5. Faculty of Science and Technology, Warrnambool Victoria, Australia.