Key Ecosystem Services and Their Regional Flow in Zhangjiakou-Chengde Region
LI Qing-xu, ZHANG Biao, SHI Yun-ting, ZHENG Hao
Journal of Ecology and Rural Environment . 2017, (1): 38 -46 .  DOI: 10.11934/j.issn.1673-4831.2017.01.006