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小麦垄作沟灌是在耕作形成的垄面种植作物、垄沟内灌溉的一种耕作方式,由于小麦自身生长所需土壤水分沿灌水沟断面以纵向下渗和向垄体横向侧渗供给,研究不同土质与垄宽在设计灌水定额一定条件下的沟灌灌水效果。文中依据非饱和土壤水动力学理论,以甘肃石羊河流域下游民勤沙漠绿洲区春小麦垄作沟灌为例,采用典型实测土壤水分运动参数,应用HYDRUS数值模拟软件计算分析砂质粘壤土和粘土在不同垄宽沟灌土壤水分运动规律,建立沟灌土壤水分二维入渗模型,从提高灌水均匀度角度评价灌水效果。研究结果表明:在不考虑停止灌水后水分再分布情况下,砂质粘壤土垄宽不宜大于45cm,粘土不宜大于30cm。研究结果为春小麦垄作沟灌技术参数进一步研究提供一定的理论基础。
Wheat furrow furrow irrigation is a tillage mode for planting crops and furrow irrigation in the furrows formed by tillage. Since the soil moisture required for the growth of wheat is infiltrated longitudinally along the gully section along the lateral infiltration to the ridge body, And furrow irrigation in the design of irrigation under certain conditions of irrigation effect. According to the theory of unsaturated soil hydrodynamics and the furrow irrigation of spring wheat in Minqin desert oasis area in the lower reaches of Shiyang River basin of Gansu Province as an example, the typical measured soil moisture movement parameters were calculated and analyzed by HYDRUS numerical simulation software Soil water movement under different furrow irrigation and furrow irrigation was established, and a two-dimensional infiltration model of furrow irrigation was established to evaluate irrigation effect from the perspective of improving irrigation uniformity. The results show that without considering the redistribution of water after stopping irrigation, the sandy ridge width of sandy loam should not be larger than 45cm, and the clay should not be larger than 30cm. The results provide some theoretical basis for the further research on furrow irrigation technical parameters of spring wheat.