1. Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region of the Ministry of Education, Chang’an University, No. 126 Yanta Road, Xi’an 710054, Shaanxi, China
2. College of Environmental Science and Engineering, Chang’an University, Xi’an 710054, P. R. China
3. Key Laboratory of Tibetan Medicine Research, Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining 810008, China
4. Qinghai Provincial Key Laboratory of Tibetan Medicine Research, Xining 810001, P. R. China