Groundwater has very important eco-value in arid and semi-arid regions. 摘要干旱半干旱地区地下水具有重要的生态价值。
Aeolian sand, distributed extensively around China?s arid and semi arid zones, is the main bearing body of wind erosion in China. 风成沙广泛分布于我国干旱与半干旱地区，是我国风蚀与风沙活动的主要载体。
