1. School of Earth Science and Resources Chang'an University Xi'an 710054 China
2. State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment Chinese Academy of Sciences Xi'an 710061 China
3. Department of Geological Engineering Qinghai University Xining 810016 China
4. Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes Chinese Academy of Sciences Xining 810008 China
5. School of Water and Environment Chang'an University Xi'an 710054 China