不同沟灌条件下土壤入渗参数的估算

Estimation on Soil Permeation Parameters in Different Furrow Irrigation

土壤入渗特性是决定沟灌灌水性能的重要参数之一。根据田间实测资料,采用水量平衡原理,利用In filt v5软件,对夏玉米田常规沟灌、固定隔沟灌和交替隔沟灌溉条件下田间土壤入渗参数的简易试验估算方法进行了研究。结果证明,用提出的方法估算不同沟灌方式下的土壤入渗参数简易可行,估算得到的水流推进曲线与利用实测资料拟合的曲线几乎完全重合;不同沟灌方式之间由于表层土壤干燥度及水平方向上的吸力梯度存在差异,估算得到的土壤入渗参数亦有所不同,表明沟灌方式不同对土壤入渗参数的确定会产生一定的影响。

Soil permeation characteristics is one of the important parameters determining the watering performance of furrow irrigation. Based on the actual measurement data, the simple methods of estimating soil permeation parameters in summer maize field under conventional furrow irrigation, fixed furrow irrigation and alternate furrow irrigation were studied by adopting the water balance equation and Infilt v5 analyzing software. The results showed that it was simply feasible to use the methods being put foreword in this paper to estimate the soil permeation parameters in different furrow irrigation ways. The advancing curves of water flow estimated almost coincided with the curves fitted by using actual measurement data. There were differences in the surface soil aridity and the suction gradients in horizontal direction among different furrow irrigation ways and in the soil permeation parameters estimated, which indicated that the furrow irrigation ways exerted on a given effect on the determination of soil permeation parameters.