1. The Key Laboratory of Unconventional Oil & Gas Geology, China Geological Survey, Beijing, P.R. China
2. School of Science, Chang’an University, Xi’an, P.R. China
3. State Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, P. R. China
4. Beiluhe Observation and Research Station on Frozen Soil Engineering and Environment in Qinghai–Tibet Plateau, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, P.R. China
5. MOE Key Laboratory of Western China Environmental System, College of Earth and Environmental Sciences, Lanzhou University, Lanzhou, P.R. China