TY - Sciences in Cold and Arid Regions A1 - T1 - Y1 - 2020-04-30 JF - Sciences in Cold and Arid Regions JO - Sciences in Cold and Arid Regions SP - 71 EP - 82 VL - 12 IS - 2 UR - http://www.scar.ac.cn N1 - 10.3724/SP.J.1226.2020.00071. ER -