KCl溶液对土壤入渗及氯离子运移特性影响研究

为了研究不同质量浓度KCl溶液对土壤入渗及溶质运移特性的影响,将KCl溶液质量浓度分别设置为0、2、3、4、5、8和10g/L,基于一维土柱入渗试验,采用CXTFIT模型对Cl-运移特性进行拟合。结果表明,累积入渗量、湿润锋推进速度、入渗率、土壤的导水能力均随着KCl溶液质量浓度的增加而增加。Kostiakov模型、Philip模型对KCl溶液入渗具有良好的适应性,相同历时下的累积入渗量与湿润锋推进距离存在良好的线性关系(R2=0.912 9)。此外,CXTFIT模型能够较好的反应不同质量浓度KCl溶液下的Cl-的运移过程且质量浓度高的KCl溶液在土壤中的对流弥散速度大于质量浓度低的。

Effect of KCl Solution on Soil Infiltration and Cl~- Transport

One-dimensional soil infiltration experiments were carried out to study the effect of different concentrations of KCl solution on soil infiltration and Cl-transport with the concentrations of KCl solution being set to 0,2,3,4,5,8 and 10 g/L respectively based on CXTFIT model.Findings from this study indicated that cumulative infiltration amount,speed of wetting front,infiltration rate and soil hydraulic conductivity increased with the increase of KCl solution concentration.Furthermore,both Kostiakov and Philip models had a good adaptability for KCl solution infiltration and there was a good linear relationship between amount of cumulative infiltration and distance of wetting front at the same period(R2=0.912 9).What's more,CXTFIT model had a relatively well response to Cl-transport under different salt solution concentrations and the convective diffusion speed of high KCl concentration was faster than the solution of low KCl concentration.