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为解决滴灌农田非饱和条件下暗管排水困难的问题,设置2种暗管滤层铺设方式,以常规暗管滤层进行排水为对照,基于室内土槽试验,分析了滤层铺设方式对暗管排水排盐效果的影响及其机理。T1处理为常规暗管滤层铺设方式,暗管四周铺设细砂滤层,T2处理为暗管上部铺设细砂,T3处理为细砂斜垫层斜铺连接体积质量分界层与暗管。结果表明,T1处理受土壤水滞后效应影响显著,暗管不排水,土壤水、盐积聚于暗管底部;T2、T3处理可在暗管上部产生局部饱和区,促使暗管排水。T2处理排水时所需历时较长,排出的水盐总量较少;T3处理可使暗管最早排水,排水时暗管下部土壤积盐最少,排水流量和排水盐总量最大。
In order to solve the difficult problem of underground pipe drainage under non-saturated condition of drip irrigation farmland, two types of underground pipe filter beds were set up, the conventional underground pipe filters were used for drainage control. Based on the indoor soil tank test, Effect and Mechanism of Drainage and Drainage on Pipe. T1 treatment for the common duct filter layer laying method, laying sand around the fine sand filter layer, T2 treatment for the laying of fine sand on the top of the tube, T3 treatment for the fine sand oblique bedding shop oblique bulk shop connecting the volume of the quality of the delamination layer and tube. The results showed that the T1 treatment was significantly affected by the soil water hysteresis. The underground pipe was not drained, and the soil water and salt accumulated at the bottom of the underground pipe. The T2 and T3 treatments could produce local saturation in the upper part of the pipe and promote the drainage of the underground pipe. T2 treatment of drainage required longer duration, the total discharge of less water and salt; T3 treatment can make the earliest drains of drainage pipes, draining the soil under the soil when the salt accumulation at least, the largest drainage flow and drainage of salt.