微咸水不同入渗水量土壤水盐运移特征研究

Study on water and salt transporting feature of soil with different infiltration amount of saline water

通过室内微咸水积水入渗土壤水盐运移模拟试验,分析了不同灌水量下湿润锋、土壤含水量、土壤含盐量、盐分浓度及Na+、Cl-浓度等的变化特征。研究结果表明,入渗水量与湿润锋呈线性关系,脱盐深度与湿润深度的比值近似为0.342。此外研究结果也显示上层土壤盐分浓度与入渗水矿化度密切相关,因此灌水量大小不仅影响湿润范围,而且直接决定上层土壤盐分含量。

The soil water and salt transporting experiment was conducted to analyze the wetting front distance, water content profile features, salt content profile features, salt concentration, Na^+ and Cl^- concentration profile of soil with different infiltration amount of saline water. The results indicated that there was a linear relationship between infiltration amount and wetting front distance, the ratio of desalinized depth and wetting front distance was about 0.342. In addition, the salt concentration of top soil was determined by salinity of infiltration water. Therefore, infiltration amount influences not only wetting scope but also salt content of top soil.