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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 16d达最大值 ,而株型松散的籽粒高蛋白型品种“中优 95 0 7(95 0 7)”于返青后 8d达最大值。后期 95 0 7叶片全氮含量下降明显 ,JD8则不同。两品种叶片叶绿素 (Chl)含量随时间消长的总趋势基本一致 ,但与叶片全氮含量变化趋势存在差别。不同类型品种对施氮量的反应不同 ,95 0 7不同施氮量间叶片全氮和Chl含量差异较小 ,而同样变化幅度的施氮量则引起JD8叶片全氮和Chl含量的明显变化。两者叶片全氮、叶绿素含量、LAI垂直分布趋势大致相同 ,但JD8各测定时期叶片全氮指数 (TNI)、叶绿素指数 (CI)及LAI层次差异明显 ,95 0 7层次梯度小于JD8。拔节期两品种TNI、CI及LAI均随层次降低而递减 ;开花期的规律性较为复杂 ;灌浆期两品种TNI都以第 2层最高 ,2、3、4层间呈递减趋势 ,CI的规律不同于TNI。两品种叶片“氮素垂直梯度”及“氮素输出量”均存在明显差异 ,冠层不同层次叶片对籽粒品质的贡献不同。
The nitrogen nutrition indices of winter wheat were analyzed from the perspective of temporal variation, horizontal and vertical spatial distribution. The results showed that the total nitrogen content of common grain protein variety “Jingdong 8 (JD8)” with compact plant type reached its maximum at 16 days after rejuvenation, while that of the high protein variety “Zhongyou 95 0 7 (95 0 7) ”Up to 8d after turning green. In the late 95 0 7, the content of total nitrogen decreased obviously, but JD8 was different. The trend of chlorophyll (Chl) content of two cultivars was basically the same with time, but there was a difference with the change tendency of total nitrogen content of leaves. Different types of cultivars responded differently to nitrogen application rates. There was little difference in total N and Chl content between 95 0 7 N application rates and N application rates, but the same N application rate caused significant changes of total nitrogen and Chl content in JD8 leaves. The trend of vertical distribution of total nitrogen, chlorophyll content and LAI in both leaves were similar, but the differences of TNI, CI and LAI were significant in different periods of JD8, but the gradient of 95 0 7 was less than that of JD8. The TNI, CI and LAI of two varieties at jointing stage decreased with the decreasing of the layers. The regularity of flowering stage was more complicated. The TNI of two varieties at filling stage were the highest at the second layer, the decreasing trend at the second, Unlike TNI. There were significant differences in “vertical gradient of nitrogen” and “nitrogen output” between the two varieties. The contribution of leaves at different layers of canopy to grain quality was different.