1. College of Environment Science, Liaoning University, 66 Chongshan Middle Street, Huanggu District, Shenyang 110036, P. R. China
2. Key Laboratory of Eco-Remediation of Regional Contaminated Environment, Ministry of Education, Shenyang University, Shenyang 110044, P. R. China
3. University of Florida-IFAS, Indian River Research and Education Center, Fort Pierce, Florida 34945-3138, United States