冬小麦群体CO_2同化速率与日净光合生产力

Population CO_2 Assimilation Rate and Daily Net Photosynthetic Productivity of Winter Wheat

根据农田冬小麦群体CO_2同化速率系统的试验观测资料分析了:(1)冬小麦群体光合速率与冠层入射光合有效辐射PAR的关系,以及各生育期的光饱和现象;(2)冬小麦群体光合速率与最大光合生产率的生育期的动态变化。提出大田作物自身的同化作用引起冠层内CO_2浓度降低,会成为群体光合生产力的限制因素。

Based on the field experiment systemic data of population CO2 assimilation rate of winter wheat, the analyses includes: a. The relationship between photosynthetic rate and population photosynthetic Active Radiation (PAR) above the canopy, and the light saturation point of each stage. b. The dynamic change of population photosynthetic rate and the maximum daily photosynthetic effectivity of winter wheat at each stage. c. The decrease of CO2 concentration in the wheat canopy caused by assimilation of the wheat itself is a limiting factor of the population photosynthetic productivity.