起垄微沟滴灌土壤水分入渗规律试验研究

Experimental Study on Soil Water Infiltration Law of Ridging Mini-ditch Irrigation

探讨了起垄微沟滴灌土壤的水分入渗规律,选取不同滴头流量、微沟坡度这两个因素各3个水平进行研究,结果表明:滴头流量的变化对垂直方向上湿润锋运移距离及土壤含水率的变化影响较大;微沟坡度的变化对水平方向上湿润锋运移距离及土壤含水率的变化影响较大。相同灌水量及微沟坡度条件下,湿润锋水平及垂直入渗距离随滴头流量的增加而减小,并且土壤含水率等值线分布密集区随滴头流量的增加向地表方向移动。相同灌水量及滴头流量条件下,湿润锋水平及垂直入渗距离随微沟坡度的增加而减小,并且土壤含水率等值线分布密集区随微沟坡度的增加向滴头方向移动。研究结果可以为不同作物种植选择适宜的微沟坡度及滴头流量提供参考。

The soil water infiltration law of ridge with mini-ditch drip irrigation is discussed in this paper. The two factors,drop head flow and mini-ditch slope,and three levels are selected to conduct study. The results show that the change of flow drops head has large influence on the vertical wetting front transport distance and soil moisture content; the change of mini-ditch slope has a great influence on horizontal wetting front migration distance and soil moisture content. Under the condition of same irrigation water and micro trench slope,the horizontal and vertical infiltration distance of wetting front decreases with the increase of the drop head flow,in addition,the contour distribution compact district of the soil moisture content moves to the surface with the increase of drop head flow; under the same irrigation water and drop head flow conditions,the horizontal and vertical infiltration distance of wetting front decreases with the increase of the mini-ditch slope,in addition,the contour distribution compact district of the soil moisture content moves to the emitter with the increase of the mini-ditch slope.The results of this study can provide a reference for selecting the appropriate mini-ditch slope and drop head flow for different crops.