灌溉水矿化度及盐分带入量对小麦相对产量影响的统计分析

Statistical Analysis of the Relationship between Irrigated Saline Water's Mineralization Degree/Salt Mass and the Relative Yield of Wheat

在搜集、统计大量咸水灌溉试验资料的基础上,选取咸水充分灌溉条件下矿化度和小麦产量的完整对应数据103组,统计分析了灌溉水矿化度及单位面积盐分带入量对小麦相对产量的影响,结果表明,随着灌溉水矿化度的增加,小麦相对产量呈线性递减趋势,当矿化度大于1.0 g/L时,灌溉水矿化度每增加1 g/L,小麦减产约5.6%;与矿化度类似,随着单位面积盐分带入量的增加,小麦的相对产量也线性降低,盐分带入量每增加1000 kg/hm2,小麦的产量将减少约2%。进一步的检验结果显示,应用灌溉水矿化度及单位面积盐分带入量均可较为可靠地估算小麦的相对产量,估算相对误差基本可控制在16%以内。

Totally 103 sets of mineralization degree vs. relative yield and salt mass per unit area vs. relative yield were pooled together, and both data sets showed general trends, independent on different conditions of soil environments, wheat species, climates, etc. The relative yield of wheat under saline water irrigation decreased with increasing degree of mineralization and brought in salt mass of the supplied saline water. Two linear functions were fitted to characterize relationships of the mineralization degree vs. relative yield, and brought in salt mass per unit area vs. relative yield, respectively with the determination coefficient of 0.59 and 0. 55. The statistical results show that increasing the degree of mineralization 1 g/L would lower down 5.6 % of the yield when the mineralization degree of the irrigated water was greater than 1 g/L; and raising the brought in salt mass per unit area 1000 kg/hm^2 would result in decreasing the yield about 2%. To verify the fitted linear functions, measured values of mineralization degree and brought in salt mass per unit area from a field experiment were respectively used to estimate the relative yield of wheat. The comparison show that the relative errors between the estimated and measured relative yield of wheat were within 16 %.