燕麦叶片光合速率、气孔导度对光强和CO_2的响应与模拟  

Response of Photosynthetic Rate and Stomatal Conductance of Oat to Light Intensity and CO_2 Concentration and Its Modeling

作　　者：王建林[1] 

机构地区：[1]青岛农业大学,山东青岛266109

出　　处：《华北农学报》2009年第3期134-137,共4页Acta Agriculturae Boreali-Sinica

基　　金：国家自然科学基金(30871485);山东省中青年科学家奖励基金(2005BSB01177)

摘　　要：为指导燕麦生产,并了解燕麦在陆地生态系统水-碳循环过程中的作用,用LI-6400便携式光合测定仪,人工控制光强和CO2浓度,在锡林郭勒盟对燕麦叶片光合速率、气孔导度进行了研究,结果表明:燕麦叶片光合速率随光强的增强而增大,可以用米氏方程对其进行描述,在自然CO2浓度下,燕麦叶片的潜在最大光合速率为18.63μmol/(m2.s);在饱和光强下,光合速率随CO2浓度的增大而增大,也可以用米氏方程对其进行描述,CO2浓度→∞时,潜在最大光合速率达到110.28μmol/(m2.s);气孔导度随光强的增强而增大,随CO2浓度的增大而减小;气孔限制值随光强的增强而增大,气孔限制值随CO2浓度的增大迅速增大,而[CO2]>200μmol/mol时,气孔限制值基本保持恒定。The response of photosynthetic rate and stomatal conductance of oat to light intensity and CO2 concentration was studied using LI-6400 in Inter Mongol China. Generally, photosynthetic rate increased with light intensity （PPFD）, which could be expressed by Michaelis-Menten function. The maximum photosynthetic rate （Prox, i） was 18.63 μmol/（ m^2· s） under natural CO2 concentration. The photosynthetic rate increased with CO2 concentration, which could he expressed by Michaelis-Menten function too. The maximum photosynthetic rate （P ） was 110.28 μmol/（ mE. s） under saturated light intensity （PPFD） while [ CO2 ]→∞ . The response of stomatal conductance to light intensity could be expressed by Michaelis-Menten function too, because stomatal conductance increased with light intensity （PPFD）, but the stomatal conductance will decrease with increase of CO2 concentration. The stomata limitation increased with light intensity （PPFD） and CO2 concentration, but when [ CO2 ] 〉 200μmol/mol, stomata limitation kept constant.

关 键 词：燕麦 光合作用 气孔导度 光强 CO2浓度 

分 类 号：S512.601[农业科学—作物学]