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3 梯田田面与田坎面积关系图

Fig. 3 The relationship between the area of flat part and ridge part of terraced fields