亏缺灌溉频次对冬小麦叶片水分生理特征的影响

Effect of Deficit Irrigation Frequency on Leaf Water Physiological Characteristics and Water Use Efficiency of Winter Wheat

通过田间试验,研究了亏缺灌溉对冬小麦相关水分生理指标、籽粒产量以及水分利用效率(WUE)等的影响。结果表明,T2处理的叶片离体失水速率最大,T3处理的气孔导度和叶水势等叶片水分生理指标均高于T1和T2处理。2个生长季中,T3处理的籽粒产量和WUE均显著高于T1和T2处理。可见,在我国北方冬小麦整个生育期间总灌溉量为120mm条件下,以拔节期和抽穗期各灌溉60mm为宜。

In order to investigate the optimal water-saving and high-efficient irrigation pattern of winter wheat in North China, effects of deficit irrigation on leaf water physiological characteristics, grain yield, and water use efficiency （WUE） of winter wheat in North China were studied based on field experiments. The results showed that the leaf vitro rate of water loss in T2 treatment was the largest, and stomatal con- ductance and leaf water potential in T3 treatment were higher than those in T1 and T2 treatments. In the two growing seasons, grain yield and WUE in T3 treatment were significantly higher than those in T1 and T2 treatments. It is suggested that winter wheat should be irrigated 60 mm at jointing and heading stages of winter wheat in North China respectively.