【摘要】 为研究大气降水补给地下水期间，在包气带中发生的水岩作用及地下水水化学组分的形成过程，在新场地段典型地貌单元处，采集岩土样品4组，分别取自沟谷上游、沟谷下游、平滩及斜坡，与去离子水按1:2的固液比进行28 d浸泡试验，并测试了浸泡水溶液中不同离子组分含量随时间的变化规律。结果表明：随着浸泡时间增加，水溶液中不同离子浓度存在不同程度增大的趋势，由此推测大气降水在补给地下水期间，在包气带将发生溶解淋滤作用，使包气带岩土中的一些物质进入水中，改变了降水的水化学性质，对地下水化学的形成起到了重要作用。更多还原

【Abstract】 In order to study water-rock interaction in the aeration zone and the formation of groundwater during precipitation recharge, four soil samples were collected from Xinchang,northwest China. They were immersed in deionized water at a solid-liquid ratio of 1:2 for 28 days.The variation of different ion components in the solution was analyzed. The results show that as the leaching time increases, the different ion contents of the soil solution increases. It is indicated that during the recharge of groundwater by precipitation, the leaching of precipitation through the aeration zone will cause some materials in the aeration zone to be transferred to the water. The chemical characteristics of the water will change and leaching plays an important role in the formation of groundwater.更多还原