用叶面标记态15N研究冬小麦不同叶位氮素的运转

以叶面涂抹^15N方式对不同类型冬小麦品种不同叶位叶片氮素的吸收、运转进行了研究。结果表明，冬小麦生育后期不同叶位叶片对子粒品质的贡献不同，旗叶对子粒的贡献高于其他叶位叶片。不同蛋白含量类型中，普通子粒蛋白类型的京冬8后期叶片氮素含量下降快，植株氮素含量低，而其转运效率高；子粒高蛋白类型中优9507品种氮素收获指数低于京冬8，其子粒中高的蛋白质含量是由于其高吸收、高贮存的结果。中优9507茎秆贮存氮素的能力较强，京冬8子粒中氮素的积累更多地依赖于叶片氮素的供应。

Study on the Nitrogen Transfer in Different Leaf in Canopy by Using Isotope 15N Labeled on Leaf

The nitrogen assimilation and transfer efficient of different leaf-position leaves in canopy were studied using isotope 15N marked on leaf. The investigated materials were two cultivars, differing in grain protein content, Jingdong 8 (JD 8), a lower grain protein cultivar, Zhongyou 9507 (9507), a higher grain protein cultivar. The results showed that the flag leaf played more important role than that of other leaves on grain quality. JD 8 had higher transfer efficient, but lower nitrogen content in its plant. 9507 had lower nitrogen harvest index than JD 8, but higher nitrogen accumulation in plant than JD 8. High grain quality of 9507 relayed on its capability of high assimilation in plant and high deposition in stem and sheath. Grain nitrogen of JD8 relayed more on the accommodation of its leaves.