干旱区研究
Assessment and Countermeasures of Ecosystem Health in the Beijing-Zhangjiakou Area
MA Zhen-gang, LI Li-li, YANG Run-tian, WANG Bao-jun
Arid Zone Research . 2019, (1): 228 -236 .  DOI: 10.13866/j.azr.2019.01.26