1. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and the Ministry of Water Resources, Yangling, 712100, China
2. University of Chinese Academy of Sciences, Beijing, 100049, China
3. College of Xingzhi, Zhejiang Normal University, Jinhua, 321000, China
4. College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070, China
5. CAS Center for Excellence in Quaternary Science and Global Change, Chinese Academy of Sciences, Xian, 710061, China