作物冠层中叶片氮素垂直分布研究进展

Development of Leaf Nitrogen Vertical Distribution in Crop Canopy Research

作物冠层中叶片氮素含量沿冠层从上向下逐渐减少,形成了氮素的垂直分布梯度。冠层中叶片氮素垂直分布是由于氮素向生长中心转运和叶片适应光在冠层中分布特征的结果,这种分布有利于提高冠层和植株的光合速率。在综合评述前人研究的基础上,对影响冠层叶片氮素垂直分布的主要因素进行了分析,指出现有研究中存在的不足,提出了下一步应重点解决的问题并对研究前景进行了展望。

With the depth of canopy increases, leaf nitrogen content reduces gradually, thus vertical nitrogen gradient develops. Vertical leaf nitrogen distribution is the transference of nitrogen to growing center and an adaptation to the light distribution in canopy. This type of nitrogen distribution increases canopy and single plant photosynthesis rate. On a basis of comprehensively appraising published research, we analyzed several factors which affected the leaf nitrogen vertical distribution in crop canopy; we pointed out the disadvantages of published research and the key problems that ought to be solved and developing perspectives in ：research of vertical leaf nitrogen distribution in this study.