论文部分内容阅读
在冬小麦各生育期测定了田间叶片光合作用速率及其相应的气象要素 ,拟合了各生育期的光合作用的光响应曲线 .得出它们的几个特征参数 :初始量子效率、最大光合速率和凸度 .在华北地区冬小麦的整个生育期 ,初始量子效率大多在 0 .0 50～ 0 .0 75之间变化 ,最大光合速率在 5～ 2 5μmol· m- 2 ·s- 1之间变化 .表明初始量子效率随生育期的变化不大 ,最大光合速率在营养生长期较高 ,为 2 0～ 2 5μmol· m- 2 · s- 1,在生殖生长期 ,随着叶片氮、磷、钾等营养元素含量的下降 ,叶片的最大光合速率显著降低 .
The photosynthetic rate and corresponding meteorological elements of field leaves were measured at each growth stage of winter wheat, and the photosynthetic light response curve of each growth stage was fitted. Some of their characteristic parameters were obtained: initial quantum yield, maximum photosynthesis rate and In the whole growth period of winter wheat in North China, the initial quantum efficiency mostly varied from 0 50 to 0 75 and the maximum photosynthetic rate varied from 5 to 25 μmol · m -2 · s -1. The results showed that the initial quantum yield did not change much with growth period, and the maximum photosynthetic rate was higher at vegetative growth stage (20 ~ 25μmol · m-2 · s-1). During the reproductive growth period, And other nutrients decreased, the maximum photosynthetic rate of leaves significantly reduced.