冬小麦叶片氮素时空分布特征及其与籽粒品质的关系

从时间变化、水平和垂直空间分布的角度对冬小麦氮素营养指标进行了分析。结果表明，株型紧凑的普通籽粒蛋白品种“京冬8（JD8）”叶片全氮含量于返青后16 d达最大值，而株型松散的籽粒高蛋白型品种“中优9507（9507）”于返青后8 d达最大值。后期9507叶片全氮含量下降明显，JD8则不同。两品种叶片叶绿素（Chl）含量随时间消

The Properties of Temporal and Spatial Distributions of Leaf Nitrogen and the Relationship between Leaf Nitrogen and Grain Quality in Winter Wheat

Under field condition, the properties of temporal and spatial distributions of leaf nitrogen content for winter wheat were analyzed. The results showed that there appeared difference in temporal and spatial distributions between the two observed winter wheat cultivar. The maximum value of leaf total nitrogen content of the two cultivar appeared at different growth stage, "Jingdong 8(JD8)", a common grain protein content cultivar, appeared at 16 days after reviving, but "Zhongyou 9507(9507)", a higher grain protein cultivar at 8 days after reviving. At late growth stages, the leaf nitrogen content of "9507" decreased quicker than that of "JD8". There was a similar trend of leaf chlorophyll(Chl) content in both cultivars but a different trend of changes between Chl content and leaf total nitrogen content. There was less discrepancy of leaf nitrogen and Chl contents between different amount nitrogen applications in "9507", but obvious changes of that in "JD8".The vertical distribution of leaf total nitrogen index(TNI), leaf Chl index(CI) and LAI were differed in the two cultivars. There were apparent differences of TNI, CI and LAI in different layers of "JD8". But "9507" showed less layer gradients of TNI, CI and LAI than those of"JD8". At jointing, the TNI and CI of both "JD8" and "9507" decreased gradually with the layer descended. There were more complex rules of TNI, CI and LAI changes for the two cultivars in different layers at anthesis. At grain filling, the second layer of both the two cultivars had the highest TNI. There showed different trends of CI and TNI in different layers.There existed distinct differences of leaf nitrogen vertical gradient and nitrogen output amount between the two cultivars. The leaves in different layers had different contribution to winter wheat grain quality.