1. Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, P.R. China
2. College of Environmental Science, Liaoning University, Shenyang, P.R. China
3. Institute of Soil Research, Liaoning Ecological Environment Protection Science and Technology Center, Shenyang, P.R. China
4. School of Environmental & Safety Engineering, Liaoning Petrochemical University, Fushun, P.R. China