陕北地区退耕还林还草工程土壤保护效应的时空特征

刘文超,刘纪远,匡文慧

Spatiotemporal patterns of soil protection effect of the Grain for Green Project in northern Shaanxi

LIU Wenchao,LIU Jiyuan,KUANG Wenhui

图1 研究区位置与地形图

Fig. 1 Location and topography of the study area