利用 8个高产小麦品种 ,通过定期取样测定生育期各器官氮素含量 ,研究其氮素动态变化 ,进而探讨不同品种各器官氮素含量与产量和蛋白质含量的关系。结果表明 ,除籽粒外 ,不同品种各器官的氮素含量均随生育期进程而降低 ,其中茎秆的降低幅度最大 ,其次为叶片 ,再次为根系。叶片、茎秆及颖壳在收获时的含氮量与籽粒产量呈负相关 ,而与籽粒蛋白质含量相关不显著 Eight high-yielding wheat cultivars were used to determine the nitrogen contents of different organs during their growth stages. The dynamic changes of nitrogen contents were studied. The relationships between nitrogen content and yield and protein content of different organs were also discussed. The results showed that except the grain, the nitrogen content of different organs decreased with the growth stage, of which the stem decreased the most, followed by the leaves and again the roots. The nitrogen content of leaves, stalks and glumes at harvest was negatively correlated with grain yield but not significant with grain protein content