节水灌溉对冬小麦光合速率和产量的影响

Effects of Water Saving Irrigation on Photosynthesis and Yield of Winter Wheat ( Triticum aestivum L.)

依据田间隔水小区试验，对节水灌溉下的冬小麦光合速率和产量进行了研究。结果表明，小麦全生育期有两个光合作用高峰，第一在营养生长与生殖生长并进期，第二在开花后；严重水分亏缺光合速率显著降低，轻度水分亏缺对光合速率无明显影响，严重水分亏缺导致光合速率显著下降的原因是非气孔因素所致；变水处理光合速率显著增加；节水高产高效灌水量应控制在２６０ｍｍ左右，灌水应在苗期和开花前进行。

According to field experiments conducted in rain shelted condition,physiological and yield chracters of winter wheat were studied.The research results indicated that there were two peaks of photosynthesis rate in winter wheat ( Trticum aestivum L),the first was during the vegetative and reproductive phase,the second after flowering.Photosynthesis rate decreased obviously under serious water stress,light water deficit did not affect photosynthesis rate significantly,the reason for serious water stress to decrease photosynthesis was no stomatic factor.Alternative water supply makes photosynthesis rate increase remarkably.Optimum irrigation quantity for winter wheat to increase yield and water use efficiency should be about 260 mm and distributed at seedling stage and before flowering.