低压滴灌条件下均匀度各指标相关关系试验研究

测试了4种滴灌带在30、60、90、120 m不同铺设长度时的滴头流量,分析了低压条件下的滴灌带不同均匀度计算指标的影响因素和变化规律,以及不同计算指标间的相关关系。结果表明,克里斯琴森均匀系数CU、变异系数Cv、分布均匀系数DU均随压力和铺设长度变化而变化,但压力对其变化影响不显著,铺设长度与CU、DU负相关,与变异系数Cv正相关;低压与常压下3个不同指标之间相关关系变化不显著,不同指标之间可用统一的线性相关关系描述,决定系数R~2达到了0.96以上。

Correlation Between Indexes of Uniformity in Low-Pressure Drip Irrigation

Four drip-irrigation tapes under low pressure were tested under four laying lengths:30 m,60 m,90 m and 120 m.The factors that affected and the variations of the uniformity indexes were analyzed and correlationsbetween the indexes were calculated.The results showed that the uniformity coefficient varied with the pressure as well as the length of the laying,but the impact of the pressure was insignificant.Both Christiansen uniform coefficient and distribution-uniform coefficient depended negatively on the laying length,while the variation coefficient was positively related to the laying length.There was a close linear relationship between the three indexes with the coefficient of determination higher than 0.96,remaining almost unchanged under both low pressure and normal pressure.