大荔县沙质土壤入渗特征研究

摘要

Taking the sandy soil in Dali county, Weinan city, Shaanxi province as the research object,the infiltration charac-teristics of sandy soil were analyzed by indoor simulation test. The results showed that the polyacrylamide (PAM) reagent had a water-retaining effect on the sandy soil with larger porosity and faster infiltration,which could delay the moisture content of water and keep the soil moist. Through the observation of wetting front change trend with time when the solution of pure wa-ter and PAM with concentration of 1,2 g/m3 seeped into sandy loam soil, we found that the water-holding capacity of sandy loam soil was greatly improved after adding PAM.%以陕西省渭南市大荔县的沙质土壤为研究对象,通过室内模拟试验,分析沙质土壤入渗的特点.结果表明,聚丙烯酰胺(PAM)试剂对空隙较大、入渗较快的沙质土壤具有保水作用,可以延缓水分的下渗速率,保持土壤的湿润.通过对纯水(CK)以及浓度分别为1、2 g/m3的PAM溶液在渗入土壤时湿润锋随时间变化的观察,发现沙质土壤保水能力在加入PAM后有了较大的改善.