不同矿化度对层状土入渗规律的影响研究

A Study on the Influence of Different Salinity on the Infiltration Law of Layered Soil

为研究不同矿化度水分对沙壤土中壤土夹层入渗规律的影响,设置4种矿化度处理,分别为0,1,3,5g/L,进行室内土柱垂直一维积水入渗试验。结果表明:壤土夹层对不同矿化度水分均有阻渗作用;各处理累积入渗量在湿润锋到达夹层界面前随时间呈非线性变化,通过夹层后随时间呈线性变化,各处理稳渗率大小关系为V(3g/L)>V(5g/L)>V(1g/L)+>V(0g/L);矿化度为0~3g/L时,累积入渗量、入渗后土壤含水率均随矿化度提高而增大;入渗结束后,各处理夹层界面上层土壤脱盐,夹层界面下层土壤积盐。

In order to study the influence of water with different salinity on the infiltration law of loam interlayer in sandy loam,four salinity treatments were set,namely 0,1,3 and 5 g/L,to carry out the indoor soil column vertical one-dimensional water infiltration test.The results show that the interlayer of loam has impervious effect on water infiltration with different salinity;the cumulative infiltration amount of each treatment presents a nonlinear change with time before the wetting front reaches the interlayer boundary,and a linear change with time after passing through the interlayer;the relationship between the stable infiltration rates of each treatment is V(3 g/L)>V(5 g/L)>V(1 g/L)>V(0 g/L);the salinity ranges from 0 to 3 g/L,and the accumulated infiltration amount and soil moisture content increase with the increase of salinity;at the end of infiltration,the upper layer of interlayer interface is desalted,and the lower layer of interlayer interface is salt-accumulated.