微咸水膜孔沟灌土壤水盐分布与灌水质量分析

Analysis of Soil Water-salt Distribution and Irrigation Performance under Brackish Water Film Hole Furrow Irrigation

摘要:

通过田间试验，研究了微咸水膜孔沟灌下流量和开孔率对土壤水盐分布和灌水质量的影响。结果表明，田面水流推进时间和距离符合幂函数分布，流量和开孔率对水流推进速度影响较大；膜孔沟灌通过降低水分蒸发，抑制盐分表聚，有效调节了土壤水盐分布，总体上，对0~40cm土层盐分具有明显淋洗作用；灌水效率Ea随开孔率的增大而增大，随流量的变化不明显；灌水均匀度Ed随流量的增大而减小，随开孔率的增大而减小；脱盐效率Es随开孔率的增大先增大后减小，随流量的变化不明显；通过方差分析对灌水质量影响因素进行排序，初步得出试验区适宜的膜孔沟灌优化灌水技术组合。

Abstract:

Effects of flow rate and opening rate under brackish water film hole furrow irrigation on soil water salt distribution and irrigation performance were studied through a field experiment. Results show that surface water flow advance time and distance conforms to a power function distribution, water advance speed is effected by flow rate and opening rate. Film hole furrow irrigation can effectively regulate soil water salt distribution of 0~40cm by reducing evaporation, inhibiting salt to the surface, soil salt leaching is significant. Ea increases with the opening rate, with the changes of flow rate is not obvious. Ed decreases with the increase of flow rate and the opening rate. With the increase of opening rate, Es increases first then decreases, with the change of flow rate is not obvious. Through variance analysis influence factors of irrigation performance sorting, optimization technology combinations for experimental zone was preliminary obtained.