TY - JOURNAL OF NATURAL RESOURCES A1 - LIU Tan, KANG Mu-yi T1 - Primary Study on Alpine Timberline of Helan Mountain Using RS and GIS Y1 - 2016-06-20 00:00:00.0 JF - JOURNAL OF NATURAL RESOURCES JO - JOURNAL OF NATURAL RESOURCES SP - 973 EP - 981 VL - 31 IS - 6 UR - {https://www.jnr.ac.cn/EN/10.11849/zrzyxb.20150707} N1 - 10.11849/zrzyxb.20150707 ER -