土壤容重对浑水膜孔灌单点源自由入渗特性的影响

Influence of Soil Bulk Density on Single Hole Point Source Free Infiltration Characteristics of Muddy Water Film Hole Irrigation

为揭示土壤容重对浑水膜孔灌单点源自由入渗条件下土壤水分入渗特征的影响,通过开展不同土壤容重的浑水膜孔灌自由入渗试验,研究了土壤容重对浑水膜孔灌自由入渗能力、湿润体特征及土壤含水率分布的影响,提出了不同土壤容重的浑水膜孔灌自由入渗单位膜孔面积累积入渗量和稳定入渗率模型;建立了浑水膜孔灌自由入渗率、湿润锋运移距离与土壤容重的关系。结果表明:浑水膜孔灌自由入渗随着土壤容重的增大,单位膜孔面积累积入渗量、稳定入渗率以及水平湿润锋运移距离都逐渐减小;在相同入渗时间内,随着土壤容重的增大,距膜孔中心相同位置处的土壤含水率减小。该研究成果可为更深入的研究浑水膜孔灌自由入渗规律和浑水膜孔灌技术提供参考。

In order to reveal the effects of soil bulk density on the soil water infiltration properties under free infiltration condition of muddy water film hole irrigation,the single point source free infiltration of muddy water film hole irrigation was tested under different soil bulk densities to analyze the influence of soil bulk density on free water infiltration capacity,wet body characteristics and the soil moisture content distribution of muddy water film hole irrigation,put forward the models of cumulative infiltration volume per unit film hole area and steady infiltration rate of free infiltration of muddy water film hole irrigation under different soil bulk density,and establish the relationship of infiltration rate and moist peak migration of free infiltration of muddy water film hole irrigation with different soil bulk density.The results showed that with the increase of soil bulk density,for the free infiltration of muddy water film hole irrigation,the cumulative infiltration volume per unit film hole area,steady infiltration rate and horizontal wetting front movement distance decreased gradually.In the same infiltration time,with the increase of soil bulk density,soil moisture content at the same location from the center of film hole gradually decreased.The research results could be used to provide the reference for further studies of infiltration law and technology of muddy water film hole irrigation.