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不同施肥水平下夏玉米光合对生理、生态因子的响应研究表明 ,施肥可以改善叶肉细胞的光合能力 ,使阻碍光合速率进一步提高的因素由非气孔限制逐渐转变为气孔限制 ,并可提高生育后期叶片的光合强度 ,延长高光合持续期 ,在日变化中表现为增加了叶片下午的光合强度。大田条件下 ,光合有效辐射 (PAR)和气孔导度 (Sc)是影响光合速率 (Pn)最主要的生态、生理因子 ,且其对 Pn 始终具有正的直接效应。而与 Pn 呈最显著线性相关的生态、生理因子则为PAR和蒸腾速率 (Tr)
Responses of photosynthesis to physiological and ecological factors of summer maize at different fertilization levels showed that fertilization could improve the photosynthetic capacity of mesophyll cells and gradually change the factors that impede the further increase of photosynthetic rate from non-stomatal limitation to stomatal limitation and increase the growth of leaves Of photosynthetic intensity, prolonged the duration of photosynthesis, in the diurnal changes showed an increase of leaf photosynthetic intensity. Under field conditions, photosynthetic active radiation (PAR) and stomatal conductance (Sc) were the most important ecological and physiological factors affecting photosynthetic rate (Pn), and had a positive direct effect on Pn. The most significant linear correlation between Pn and Pn was observed for PAR and transpiration rate (Tr)