【摘要】 在大田条件下,进行了不同水分和氮素运筹对冬小麦生育后期光合特性及产量影响的研究.结果表明:适当增施氮素有利于提高旗叶的叶绿素含量 Chl 、PS 潜在活性 Fv/Fo 及PS 光化学的最大效率 Fv/Fm ,而减少荧光非光化学猝灭系数 qN ,从而提高光合速率 Pn 和产量.但水分不足或过多,均会影响氮素对光合性能的改善,进而影响水分及氮素的效率和产量的形成.更多还原

【Abstract】 Under field conditions,effects of irrigation and nitrogen application on photosynthetic characteristics and yield of winter wheat were studied in the late stages of wheat development.The results indicated that the photosynthetic characteristics of flag leaves variously responded to water and nitrogen application.Chlorophyll contents,PSⅡ activity (Fv/Fo) and the maximal quantum efficiency of PSII photochemistry (Fv/Fm) increased and nonphotochemical quenching coefficient (qN) decreased when suitably more nitrogen applied,the treatment of suitably higher nitrogen raised net photosynthetic rate (Pn) and yield of winter wheat consequently.However,treatments of insufficient and too much irrigation badly affected the abovementioned photosynthetic characteristics by nitrogen application,especially in the rather late period,which reduced the wheat yield and irrigation and nitrogen efficiency subsequently.更多还原