[1] Chinese Acad Sci, State Key Lab Loess & Quaternary Geol, Xian 710075, Peoples R China
[2] Chinese Acad Sci, Inst Earth Environm, Xian 710075, Peoples R China
[3] State Key Lab Earth Surface Proc & Resource Ecol, Beijing 100875, Peoples R China
[4] Univ Western Australia, Sch Plant Biol, Perth, WA 6009, Australia