Funding for this research was provided by:
the National Natural Science Foundation of China (No. 21102011)
Higher Education Natural Science Foundation of Jiangsu Province (No. 13KJB430025)
Environmental science research project of Jiangsu Province (No. 2013004)
the Natural Science Foundation of Jiangsu Province (No. BK20141172)
Yancheng City Industrial Science and Technology Support Project (2013)