TY - Sciences in Cold and Arid Regions A1 - T1 - Y1 - 2021-04-30 JF - Sciences in Cold and Arid Regions JO - Sciences in Cold and Arid Regions SP - 87 EP - 94 VL - 13 IS - 2 UR - http://www.scar.ac.cn N1 - 10.3724/SP.J.1226.2021.20051 ER -