不同施肥条件下夏玉米光合对生理生态因子的响应

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(S.)是影响光合速率(Pn)最主

Response of Photosynthesis to Eco-physiological Factors of Summer Maize on Different Fertilizer Amounts

Fertilizer Application improved the photosynthetic ability of summer maize mesophyll cell, which made the limiting factor of photosynthetic rate from nonstomatal limitation to stomatal limitation gradually, enhanced photosynthetic rate in the post stage, prolonged the high photosynthesis period, and raised photosynthetic ability in the afternoon. In the field grown condition, the main eco physiological factors affecting photosynthetic rate (P n) were photogynthetic activity radiation (PAR) and stomatal conductance (S c), which had positively direct effects on photosynthesis. PAR and transpiration rate (T r) were eco physiological factors significantly correlated with P n.