河套平原不同水源灌溉条件下土壤盐分分布与运移规律

Distribution and Migration Law of Soil Salinity under Different Water Source Irrigation Conditions in Hetao Plain

河套平原地处黄河中上游,广泛存在土壤盐碱化现象。本文以河套平原为研究区,通过实地取样、室内模拟试验与理化分析,探究盐分在土壤中的垂向迁移规律。室内模拟试验以黄河水、地下水和纯水灌溉当地农用土壤,分析灌溉水质对土壤盐分分布与运移规律的影响。试验结果表明,长期采用黄河水、地下水灌溉会带入以Na^(+)为主的盐分,盐分在灌溉过程中向下运移并积累。

The Hetao Plain is located in the middle and upper reaches of the Yellow River,where soil salinization is widespread.Taking the Hetao Plain as the research area,this paper explores the vertical migration of salinity in soil through field sampling,indoor simulation experiment and physical and chemical analysis.The indoor simulation experiment irrigates the local agricultural soil with Yellow River water,groundwater and pure water,and analyzes the influence of irrigation water quality on the distribution and migration of soil salinity.The experiment results show that the long-term use of the Yellow River water and groundwater irrigation will bring in the salinity dominated by Na^(+),and the salinity will migrate downward and accumulate during the irrigation process.