流量对地下滴灌土壤水分运动的影响研究

Effects of Dripper Discharge on Soil-water Movement under Subsurface Drip Irrigation

通过地埋内镶式滴头的室外灌水试验,研究了流量对地下滴灌条件下的土壤水分运动规律的影响。研究分析表明,流量越大湿润锋运移速度越快,而在相同的灌水量下灌水结束时湿润体范围略微较小;灌水初期,流量对湿润锋运移速率的影响最大,超过一定时间后,各方向的运移速率趋于一致;流量越大滴头附近的高含水率区范围越大,相同剖面处的含水率也越大。

Through outdoor irrigation tests of the in-line drip-tape, the law of soil-water movement in different dripper discharge rate under subsurface drip irrigation is researched. The results show that the wetting front movement is faster under the higher trickle discharge rate, while the volume of wetted soil is smaller slightly than that under the lower discharge; the trickle discharge has larger influence on the rate of the wetting front movement at the initial stages of irrigation than any other stages and the rate in all directions is close to the same value; the range of higher water content zone around the dripper and water content at the same section both increase with the enlargement of dripper discharge rate.