1. School of Environmental Science and Engineering, Hubei Polytechnic University, Huangshi 435003, China
2. Hubei Key Laboratory of Mine Environmental Pollution Control and Remediation, Hubei Polytechnic University, Huangshi 435003, China
3. State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, China
4. College of Resources & Environment, Huazhong Agricultural University, Wuhan 430070, China
5. School of Human Settlements and Civil Engineering, Xi'an Jiaotong University, Xi'an 710049, China
6. Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China