保水剂混施用量对沙质土壤水分垂直入渗特性的影响

Effects of Mixed-application Dosages of Aquasorb on Water Vertical Infiltration Characteristics of Sandy Soil

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 determine the effects of aquasorb with different mixed-application dosages on characteristics and dynamic changes of soil water infiltration,the dynamic changes of infiltration rates,cumulative infiltrations,and wetting front of soil water under aquasorb were analyzed through the lab experiments.The results showed that the mixed-application aquasorb reduced the infiltration rates,the cumulative infiltration and the move distance of the wetting front.The more the mixed-application dosages of aquasorb is applied,the greater the inhibition degree on the infiltration rates is,the cumulative infiltration and the move distance of the wetting front were smaller.When the dosages of aquasorb were 0.75% and 1.00%,the surface soil moisture was increased sharply;meanwhile,the soil moisture in 8-14 cm layer was lower because of the role of the larger penetration resistance.When the dosage of aquasorb was 0.50%,the soil moisture in 8-14 cm layer was more.