土壤物理特性对地下滴灌灌水器流量影响分析

Influence of Soil Physical Properties on Emitter Discharge of Subsurface Drip Irrigation

地下滴灌灌水器流量由于受到土壤因素的制约而比地表滴灌流量有所减小,研究土壤物理特性对地下滴灌灌水器流量的影响程度对地下滴灌水力计算与工程设计具有重要的理论和实用价值。文中分别选取灌水器工作压力、土壤容重和土壤初始含水率为因素,采取混合水平均匀设计安排试验方案,将归一化处理后的各因素实测数据进行回归分析,估算各试验因素对地下滴灌灌水器流量的影响程度。结果表明:地下滴灌中工作压力是决定灌水器流量的主要因素,土壤容重和土壤初始含水率对地下滴灌灌水器流量的影响较弱,但在地下滴灌水力计算与工程设计中也不可忽略。

The emitter discharge of subsurface drip irrigation （SDI） is smaller than that of drip irrigation （DI） at the same work pressure. Analyzing the influence degree of soil physical properties on SDI emitter discharge has important theoretical and practical application values to SDI hydraulic calculation and design. For this reason, the experiment scheme was arranged based on uniform design with mix levels of three factors. The three factors are respectively work pressure of emitter, soil bulk density and initial soil water content. After standardized actual experiment data, regression analysis was done and the influence degree of soil physical properties on SDI emitter discharge was estimated. Analysis results showed that work pressure was the decisive factor to SDI emitter discharge. The influences of soil bulk density and initial soil water content on SDI emitter discharge were not remarkable, but they could not be ignored in SDI hydraulic calculation and design.