浅层时序灌溉条件下入渗压力对水分运移的影响

为寻找合适的浅层灌溉方法,采用水平方向和垂直方向的一维压力入渗及再分布实验,研究入渗压力对湿润峰前进速度、入渗率、土壤平均含水量、水分再分布过程中湿润峰前进速度及对干土层厚度的影响.研究结果表明：入渗阶段提高入渗压力增大了湿润峰前进速度、入渗率及平均含水量,其中对湿润峰前进速度和入渗率的影响主要表现在入渗初期;入渗压力对再分布过程湿润峰前进速度没有影响;入渗压力对垂直土柱干土层厚度没有影响;调节入渗压力是调节含水量大小及水分分布形态重要手段,适当地减小入渗压力能避免形成植物所不需要的高含水量区。

The Effects of Infiltration Pressure on Soil Water Movement Under Subsurface Irrigation

In order to find a suitable shallow-layer groundwater irrigation,the one-dimensional pressure infiltration and redistribution experiment in the horizontal direction and the vertical direction was used to study effects of infiltration pressure on wetting rate,infiltration rate,water amount and the thickness of dry soil layer.The results showed that：wetting rate,infiltration rate and the average water amount was increasing while improving infiltration pressure,the effects of infiltration pressure on wetting rate and infiltration rate mainly occurred at the early stage;infiltration pressure had no effects on wetting rate in the redistribution and on the thickness of dry soil layer;infiltration pressure regulation is the important method to adjust the size of water amount and water distribution;reducing the infiltration pressure properly can avoid formating the high water amount area which plants don＇t need.