1. Anhui Agricultural University, Hefei 230000, Anhui China
2. Department of Biology, Mississippi College, Clinton, Mississippi 39056, United States
3. Department of Mathematics and Statistical Sciences, Jackson State University Jackson, Mississippi 39217, United States
4. Key Lab Nonpoint Source Pollution Control, Minister of Agricultural and Rural Affairs, Chinese Academy of Agricultural Sciences Institute of Agricultural Resources and Regional Planning, Beijing 100081, Peoples Republic of China
5. Department of Chemistry and Biochemistry, Jackson State University, Jackson, Mississippi 39217, United States