1State Key Laboratory of Land Degradation and Ecological Restoration of Northwestern China, Yinchuan 750021, Ningxia, China
2College of Natural Resources and Environment, Northwest A & F University, Yangling, Shaanxi 712100, China
3Wilfrid Laurier University, Yellowknife Research Office, Yellowknife, NT X1A 2P8, Canada
4State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, China
5Center for Excellence in Quaternary Science and Global Change, Chinese Academy of Sciences, Xi’ an 710061, China