中文摘要：

在大田条件下,以青麦6号为试验材料,研究了5个灌水处理下旱地冬小麦灌浆期旗叶的光合参数、水分利用效率和产量的变化。采用开放式气路测定了小麦旗叶的净光合速率、气孔导度、胞间二氧化碳浓度、蒸腾速率等相关指标,并通过非直角双曲线模型对小麦旗叶的净光合速率进行模拟,得出了旗叶光响应曲线的特征参数。结果表明,在补灌小于两水的情况下,旗叶的净光合速率、气孔导度、蒸腾速率都随着补灌量的增加呈上升趋势,均以拔节水60mm＋灌浆水60mm（W3）的处理最高,而胞间CO2浓度、水分利用效率随着补灌量的增加呈下降趋势;而在补灌三水的情况下,在拔节水60mm＋孕穗水60mm＋灌浆水60mm（W4）的处理的净光合速率、气孔导度都明显小于补灌一水和两水的处理,而胞间CO2浓度、蒸腾速率却明显大于补灌一水和两水的处理,同时水分利用效率也是所有处理中最低的,表明过量的补灌对旱地小麦灌浆期旗叶的光合作用有消极作用。产量虽然以W3处理的产量为最高,但是除去对照处理,其他4个处理之间产量差异不显著。综合考虑产量、水分利用效率等因素,以拔节水60mm（W1）的处理为达到旱地冬小麦高产的最佳补灌模式。

英文摘要：

In field experiment,the effect of five irrigation treatments on the change of flag leaf photosynthetic parameters ,water use efficiency and grain yield in kernel filling stage of dry land winter wheat is studied with Qingmai 6. Net photosynthetic rate （Pn） ,stomatal conductance （Gs） ,intercellular CO2 concentration （Ci） and tran- spiration rate （Tr） in flag leaves of super-high yielding winter wheat were measured in an open-circuit gas channel system,moreover,Pn of winter wheat flag leaf is simulated in nonrectangular hyperbolic model and the characteristic parameter of light response is obtained. The results showed that Pn,Gs and Tr were on the rise with the twice supplementing irrigations and less twice supplementing irrigations,the highest one of which was treatment W3 （Jointing 60 mm ＋ Filling 60 mm） ,but Ci and water use efficiency （WUE） had decreasing tendency with supplementing irrigation; But Pn and Gs of treatment W4 （Jointing 60 mm ＋ Booting 60 mm ＋ Filling 60 mm） were less than that less twice sup- plementing irrigations,Ci,Tr were higher than that else treatments obviously,and WUE is the least all of treatments, which indicated that over supplementing irrigation has negative influence on photosynthesis of flag leaves in dry-land winter wheat at filling stage. The grain yield of the treatment W3 is the highest ,but there were no significant difference among the other four treatments except the CK. Considering the grain yield,water use efficiency and other factors,the treatment W1 （jointing irrigation irrigation 60 mm） is the best supplementing irrigation model in dry land winter wheat and high-yield cultivation.