清代青藏高原东北部河湟谷地林草地覆盖变化
吴致蕾, 刘峰贵, 张镱锂, 陈琼, 周强, 杨登兴

Forest and grassland coverage change in the Yellow River-Huangshui River Valley in northeast Qinghai-Tibet Plateau during the Qing Dynasty
Zhilei WU, Fenggui LIU, Yili ZHANG, Qiong CHEN, Qiang ZHOU, Dengxing YANG
图6 1726、1772、1806、1845、1878年草地减少空间分布图
Fig.6 Spatial distribution of grassland coverage reduction in 1726, 1772, 1806, 1845, 1878