延安市土地生态风险时空格局演变研究

段艺芳, 任志远, 周晓, 孙艺杰

Spatio-temporal variation in the land ecological risk of Yan’an City

Yifang DUAN, Zhiyuan REN, Xiao ZHOU, Yijie SUN

图5 不同时期土壤水力侵蚀强度等级分布

Fig.5 Distribution of soil water erosion in different period