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11 2000-2010年和2010-2013年陕北地区降水量和植被覆盖度变化
Fig. 11 Comparison of variations of mean annual precipitation and vegetation cover fraction of 2000 to 2010 and 2010 to 2013