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选用3个春小麦品种(系),采用大田试验方法,在冬灌1800m3.hm-2的基础上,在生育期设3次灌水处理(T1)、2次灌水处理(T2)和1次灌水处理(T3),每次灌水1050m3.hm-2,研究土壤水分对春小麦生育期气孔导度的影响及气孔导度与相关环境因素的关系.结果表明:灌水处理对春小麦生育期气孔导度的影响较大,气孔导度随着灌溉次数的减少逐渐降低,同时不同基因型间存在差异.从拔节期到开花期,不同处理春小麦气孔导度变化一致,都呈先升高后降低趋势,在抽穗期达到峰值;开花期之后各处理出现差异,T1各品种气孔导度先下降后上升,T2品种间表现不同,T3一直呈下降趋势.各环境因子中,大气相对湿度对春小麦气孔导度的影响最大,两者的相关系数在T2和T3中分别达显著(0.82*)和极显著水平(0.92**).春小麦适应水分亏缺的气孔调节机理为反馈式调节.
Three spring wheat cultivars (lines) were selected. Three field irrigation treatments (T1), two irrigation treatments (T2) and one irrigation treatment were conducted on the basis of 1800 m3.hm-2 winter irrigation in the field. T3) and irrigation of 1050m3.hm-2 at a time to study the effects of soil moisture on stomatal conductance and stomatal conductance of spring wheat during the growth period.The results showed that the effects of irrigation on stomatal conductance of spring wheat Stomatal conductance decreased with the decrease of irrigation times, and there were differences among different genotypes.The stomatal conductance of different treatments were the same from jointing stage to flowering stage, both of them increased first and then decreased, and at heading stage Reached the peak value. After the anthesis, there were differences among the treatments, and the stomatal conductance of all varieties of T1 increased first and then decreased, while the performance of T2 varieties was different and T3 decreased continuously. Among all the environmental factors, the relative humidity of atmosphere had the greatest effect on the stomatal conductance of spring wheat (0.82 *) and extremely significant level (0.92 **) in T2 and T3 respectively.The stomatal adjustment mechanism of spring wheat in response to water deficit was a feedback regulation.