涌泉根灌在黄土坡地的水分运移规律试验

Experiment on water migration of surge root irrigation in loess sloping fields

为了了解涌泉根灌这项微灌技术灌水后的水分运移情况,在野外黄土坡地利用剖面法对涌泉根灌在不同孔径、孔深条件下土壤水分运移规律进行了研究.结果表明,在不同孔径、孔深处理下,湿润体水平扩散半径、向上入渗距离和向下入渗深度有不同的影响,且均与时间有显著的幂函数关系;涌泉根灌停止后24 h内的土壤湿润体水平及竖直方向扩散相对变化超过了47%,湿润体平均含水量相对降低了30%;24 h后的扩散较小,平均含水量下降较小.涌泉根灌停止后24 h时的湿润体特征值可作为涌泉根灌系统设计的依据;推荐涌泉根灌适宜的孔洞深度为30~40 cm,孔径为φ6 cm.研究结果可为涌泉根灌技术的实际应用提供理论参考.

In order to know the water migration of a new micro-irrigation technique of surge root irrigation,different water migrations of surge root irrigation were studied by cross-sectional method under different hold diameters and depths in the wild loess sloping fields.The results show that under different hole diameters and depths,there are different influences on the horizontal diffusion radius,the upward infiltration distance and the downward infiltration depth of wetting front,and all of them have remarkable power rules with time;During 24 h after stopping surge root irrigation,the wetting front increased more than 47% relatively on horizontal and vertical diffusion,and the average moisture content of wetted volume decreased 30% relatively;After 24 h the wetting front diffused less and the moisture content decreased less.Therefore the design of surge root irrigation system can be established on the characteristic value of wetted volume on 24 h after stopping surge root irrigation,it will be proper when the hole depth is 30～40 cm and the hole diameter is of 6 cm.This research results can provide theory reference on application of the surge root irrigation technology.