不同灌溉模式下苜蓿种子产量构成因素及花部特征对水分亏缺的响应

The Quantitative Characteristics of Seed Yield Components and Floral Traits under Different Irrigation Patterns of Alfalfa

【目的】通过分析不同灌溉模式下苜蓿种子产量各构成因素及花部特征对水分亏缺的响应,探讨水分影响种子产量形成的机制,为当地苜蓿种子田灌水模式的确立提供依据。【方法】设置不同的灌水次数和灌水时期,观测苜蓿种子产量构成因素、花部特征参数的响应,分析水分的影响机制,确定适应的灌水模式。【结果】在分枝期、初花期和结荚期各灌一次水的处理,花序数/枝(18±1.56)、荚果数/枝(73±3.99)、结荚率/序(57.6±1.97)、种子数/枝(2 373.38±47.58)均处于较高水平。花部特征参数没表现出对水分亏缺的显著响应。【结论】分枝期、初花期和结荚期各灌一次水的处理具有较高的种子产量。可能早春融雪保证了现蕾期较高土壤含水量的留存,使得花部特征参数没表现出对水分亏缺的显著响应。

[ Objective] The quantitative characteristics of seed yield components and floral traits under different irrigation patterns of alfalfa were studied in order to explore the consequence of water deficit and pro- vide the references for the local alfalfa seed production. [ Method ] In addition to the purpose mentioned a- bove, the response of seed yield components and floral parameters were researched by setting different irriga- tion frequency and irrigation period in seed field of alfalfa. [ Result] The results showed that the number of ra- cemes per branch （18 ± 1.56）, number of pods per branch （73 ±3.99）, pod set rate per raceme （57.6 ± 1.97 ） and the seed yield per branch （2,373.38± 47.58） were higher, when they were irrigated respeetively one time in the stage of branching, initial flowering and pod set. But there was not significant response be- tween floral parameters and water deficit. [ Conclusion ] The irrigation patterns which were irrigated one time respectively in the branching stage, initial flowering stage and pod stage helped The snowmelt in early spring might ensure the higher retention of soil moisture the floral parameters displaying no significant response to water deficit. to produce higher seed yield in the budding stage, making