中文摘要：

选择义长灌域作为研究区，根据水量平衡原理，定量分析了1991-2010年灌域地下水各均衡要素的变化情况，评价了节水改造对地下水的影响．结果显示，节水改造工程实施后，地下水补给量平均减少了5100万m^3·a^-1，地下水消耗量平均减少了4390万m^3·a^-1，地下水位降低了0．74m.

英文摘要：

After implementation of water-saving construction in Hetao irrigation dtstrmt and a clecrease m irrigation water consumption from the Yellow River, replenishment of groundwater decreased over the whole irrigated area. Analysis of groundwater balance from 1991 to 2010 revealed changes in groundwater elements before and after the construction in Yichang Experimental Station. Data showed an average decrease in groundwater recharge of 5.1 × 10^7m^3·a^-1 and a reduction in groundwater consumption of 4.4 × 10^7 m^3·a^-1. Groundwater level has dropped 0.74 m.