地下滴灌土壤水分运移分布规律试验研究

Laboratory Experimental Study on Soil-water Movement of Subsurface Drip Irrigation

通过地下滴灌的室内试验,研究了不同滴头流量对土壤湿润体特性的影响。试验采用杨凌粘壤土,滴头流量分别为0.3、0.5、0.70、.8 L/h,埋深为25 cm。结果表明,湿润体为轮廓线近似于抛物线的不规则形体;湿润锋运移与时间的变化呈显著幂函数关系;滴头流量0.7 L/h为平均含水率由稳态到紊乱态的拐点,该点可以作为地下滴灌设计的依据。

Through subsurface drip irrigation laboratory experiments,different dripper discharge on the soil wetting front were analyzed.The experiment take the Yangling clay loam soil,and the experimental dripper discharges were 0.3,0.5,0.7,0.8 L/h,and the dripper was 25 cm deeply buried.The results indicated that the soil wetting front was irregular front which outline was irregular parabola;the soil bulk density and the change of time is a power function relation;dripper discharges 0.7 L/h express the average soil moisture from content to increase,and it can be as the design basis of subsurface drip irrigation.