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为了探明保水剂在不同混施用量下对沙质土壤水分入渗性能及变化过程的影响,通过室内积水入渗试验,比较分析了保水剂作用下土壤水分的入渗率、累积入渗量及湿润锋等的动态变化。结果表明:混施保水剂不同程度上减小了沙质土壤水分入渗率、累积入渗量和湿润锋运移距离。保水剂混施用量越多,入渗率的降低程度越大,累积入渗量和湿润锋运移距离越小。试验中,保水剂混施用量为0.75%和1.00%时,表层土壤含水率急剧增加;同时,由于保水剂较大的阻止入渗作用,使得8-14cm土层土壤含水率较低。混施用量0.5%时,8-14cm土层具有较高的土壤含水率。
In order to find out the effect of SAP on the infiltration capacity and process of sandy soil under different mixing rates, the infiltration rate of soil moisture under the effect of SAP was compared with the cumulative infiltration The amount of wet front and other dynamic changes. The results showed that the mixed SAP could reduce the infiltration rate of sandy soil, the cumulative infiltration capacity and the migration distance of wetting front to varying degrees. The greater the amount of SAP, the more the infiltration rate decreases, and the smaller the cumulative infiltration rate and the wetting front migration distance. In the experiment, when the amount of water-retaining agent is 0.75% and 1.00%, the moisture content of surface soil increases sharply. At the same time, soil moisture of 8-14cm soil layer is lower due to the larger infiltration preventing effect of water-retaining agent. Mixed application of 0.5%, 8-14cm soil layer has a higher soil moisture content.