摘要
在室内模拟了降水入渗非饱和带土壤补给地下水的过程,具有一定盐分含量的降水入渗土壤剖面,收集土柱底部出流水样品,测试样品中的Cl^-、SO_4^(2-)、Ca^(2+)、Mg^(2+)含量。通过对比分析不同离子含量随累计出流水量的变化情况可知:当累计出流水量超过200 m L后,样品中的Cl^-含量与模拟降水中的含量基本一致;对于SO_4^(2-),入渗的水分对土壤中的SO_4^(2-)是缓慢溶解的过程,并且溶解速率不是均匀的;累计出流水量超过200 m L后,出流水中Ca^(2+)、Mg^(2+)含量均小于模拟降水中的,原因是在水分入渗过程中,土壤胶体对入渗水中的Ca^(2+)、Mg^(2+)有吸附作用。
In this paper, the process of precipitation recharging groundwater through theunsaturated zone was simulated indoor. The precipitation with some salt concentration infiltrated in soil profiles, the water from soil column was collected. Chloride, sulfate ions, calcium and magnesium ion contents of samples were tested. From the comparison of ion content variation through water increasing, it is concluded thai chloride content of the water from soll column is close to the one of simulated precipitation when the total outflow water is more than 200 mL; the dissolution of sulfate ions in soil is slow and uneven; when the total outflow water is more than 200 mL, calcium and magnesium ion content of samples are all less than the one of simulated precipitation, because that calcium and magnesium ions in precipitation are absorbed by soil colloids in infiltration process.
作者
孙晓旭
丁克强
史公勋
SUN Xiaoxu DING Keqiang SHI Gongxun(School of Environmental Engineering, Nanjing Institute of Technology, Nanjing 211167, China The Third Construction Limited Company of China Construction Eighth Engineering Bureau, Nanjing 210046, China)
出处
《人民黄河》
CAS
北大核心
2017年第1期92-94,140,共4页
Yellow River
基金
国家自然科学基金资助项目(41271329)
南京工程学院引进人才科研启动基金项目(YKJ201327)
关键词
降水入渗
盐分含量
淋滤
吸附作用
precipitation infiltration
salt concentration
leaching
adsorption
