1. Key Laboratory of Land Surface Process and Climate Change in Cold and Arid Regions, Northwest Institute of Eco‐Environment and Resources Chinese Academy of Sciences Lanzhou Gansu 730000 China
2. Beiluhe Observation and Research Station on Frozen Soil Engineering and Environment in Qinghai‐Tibet Plateau Lanzhou Gansu 730000 China
3. Univ. of Chinese Academy of Sciences Beijing 100049 China