矿化度对微润灌土壤入渗特性的影响

采用室内土箱模拟试验的方式,研究了5种矿化度条件下微润灌土壤水分的入渗特性。试验结果表明:矿化度对湿润体形状影响小,微润灌湿润体横剖面呈近似圆形;矿化度对湿润体体积影响较大,矿化水湿润体体积大于清水的湿润体体积。当矿化度为3 g/L时,微润灌湿润体湿润锋运移速率最大,湿润锋运移速率与时间呈幂函数关系。矿化水可增加微润灌的累计入渗量,但累计入渗量与矿化度之间不是单调关系,当矿化度为3 g/L时,累计入渗量达到最大,土壤平均含水率也最大。

Effects of Mineralization Degrees on Soil Infiltration under Moistube-irrigation

n order to explore the impact of mineralization degrees on infiltration character of soil under moistubeirrigation, an indoor soil box simulation experiment method was used to investigate the infiltration character of soil water under five different mineralization degrees selectively. Results indicated that the degree of mineralization had small impact on the shapes of soil wetted zone, and the wetting front shape were similar to circle. Degree of mineralization had a relatively bigger influence on the volume of wetted soil.The volume of wetted soil in mineralized water was bigger than that in pure water. When the degree of mineralization was 3g/L, the wetting front (horizontal, vertical up and down) migration distance was the farthest, which had a power function relationship with time. The mineralized water could increase cumulative infiltration.However the relationship between cumulative infiltration and degree of mineralization was not linear relationship.The cumulative infiltration and average soil moisture content was the biggest when the degree of mineralization was 3g/L.The results of this study provided reference for the utilization of moistubeirrigation with mineralized water.