灌溉对冬小麦水分利用效率的影响研究

通过设计不同的灌溉处理，从叶片水平、群体水平和产量水平3个层次系统分析了冬小麦水分利用效率(Water Use Efficiency, WUE)的变化特点及其内在联系。结果表明：叶片水平WUE或蒸腾效率(Transpiration Efficiency, TE)是群体蒸散效率基础；气孔运动机制及光合作用和蒸腾作用对环境变化响应的差异是叶片水平WUE的生理基础；而产量水平WUE是群体蒸散效率与收获指数共同决定的。随耗水量的增加，叶片光合速率、群体干物质积累及籽粒产量都呈二次曲线增长趋势，结果使叶片水平WUE

Effect of irrigation on water use efficiency of winter wheat

The changes and relationship of water use efficiency(WUE) at different levels of winter wheat were studied in detail by designing different irrigation treatments. The results showed: the WUE at leaf level or transpiration efficiency (TE) was the basis of evapotranspiration efficiency (ETE). The mechanism of stoma and the differences of the correspondence of photosynthesis and transpiration to environmental changes were the physiological basis of WUE at leaf level. The WUE at yield level was determined by evapotranspiration efficiency (ETE) and harvest index (HI). Photosynthesis rate, dry matter accumulation of population and grain yield had a quadratic relationship with crop water consumption, which resulted in a linear decrease on WUE at leaf and population levels and quadratic changes in WUE at yield level. The WUE at different levels of winter wheat had a great variation in values and changes caused by crop water consumption.