微咸水入渗土壤水盐运移特征分析

提高水分的淋洗脱盐效率也是节水的一个重要途径。通过室内垂直入渗试验研究了淋洗水量、入渗水质和土壤初始含水量对土壤脱盐状况和水分洗盐效果的影响。结果表明,脱盐深度随入渗水量的增加呈幂函数增加,随入渗水矿化度和土壤初始含水量的增加而减小;脱盐区土壤平均含盐量随累积入渗量的增加而减少,随入渗水矿化度和土壤初始含水量的增加而增加。水分的脱盐效率随淋洗水量的增加呈幂函数减小,随入渗水矿化度的增加线性减少。土壤初始含水量对初期水分脱盐效率有影响,但对后期水分脱盐效率影响不大。对脱盐效率影响因素的分析可以为设计合理的淋洗水量提供参考。

Analysis of the Characteristics of Soil Water and Salt Movement in Saline Water Infiltration

Improving the water desalting efficient is also an important method to saving water.Through indoor vertical infiltration experiments,it was studied how the leaching water volume,water salinity and initial soil water content influence the desalting conditions of soil and the leaching effect.The results indicated that desalt depth increased exponentially with cumulative infiltration water volume,decreased with water salinity and initial water content.The average soil salt content of desalt region cut down as the cumulative infiltration volume rose and went up with the water concentration and initial water content.The water-desalting efficient decreased exponentially with increasing leaching water volume and linearly with water salinity.Initial water content also had effect upon water desalting efficient but confined to initial stage of infiltration.The analysis of the factors influencing water-desalting efficient could provide references to design of reasonable leaching water volume.