1. College of Agriculture, Ningxia University, Yinchuan, P.R. China
2. Institute of Agricultural Resource and Environment, Ningxia Academy of Agricultural and Forestry Science, Yinchuan, Ningxia Province, China
3. Key Laboratory of Regional Environment and Eco-Remediation (Ministry of Education), Shenyang University, Shenyang, China
4. College of Natural Resources and Environment, South China Agricultural University, Guangzhou, China
5. Institute of Food and Agricultural Sciences, Indian River Research and Education Center, University of Florida, Fort Pierce, FL, USA