Fractional Vegetation Cover Change and Its Evaluation of Ecological Security in the Typical Vulnerable Ecological Region of Northwest China:Helan Mountains in Ningxia
LIN Yan-min, NAN Xiong-xiong, HU Zhi-rui, LI Xin-qing, WANG Fang
Journal of Ecology and Rural Environment . 2022, (5): 599 -608 .  DOI: 10.19741/j.issn.1673-4831.2021.0461