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-600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110.28 μmol/(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]>200 μmol/mol时,气孔限制值基本保持恒定.
关键词:
燕麦,
光合作用,
气孔导度,
光强,
CO2浓度
Abstract: The response of photosynthetic rate and stomatal conductance of oat to light intensity and CO2concentra2 tion was studied using LI26400 in Inter Mongol China. Generally,photosynthetic rate increased with light intensity (PPFD),which could be expressed by Michaelis2Menten function. The maximum photosynthetic rate (Pmax,i) was 18. 63 μ mol/ (m2· s) under natural CO2concentration. The photosynthetic rate increased with CO2concentration,which could be expressed by Michaelis2Menten function too. The maximum photosynthetic rate (Pmax,c) was 110. 28μ mol/ (m2· s) under saturated light intensity (PPFD) while [CO2] →∞. The response of stomatal conductance to light intensity could be ex2 pressed by Michaelis2Menten function too,because stomatal conductance increased with light intensity (PPFD),but the stomatal conductance will decrease with increase of CO2concentration. The stomata limitation increased with light intensity (PPFD) and CO2concentration,but when [CO2] > 200μ mol/ mol,stomata limitation kept constant.
Key words:
Oat,
Photosynthetic rate,
Stomatal conductance,
Light intensity,
CO2concentration
中图分类号:
王建林. 燕麦叶片光合速率、气孔导度对光强和CO2的响应与模拟[J]. 华北农学报, 2009, 24(3): 134-137. doi: 10.7668/hbnxb.2009.03.029.
WANG Jian lin. Response of Photosynthetic Rate and Stomatal Conductance of Oat to Light Intensity and CO2 Concentration and Its Modeling[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2009, 24(3): 134-137. doi: 10.7668/hbnxb.2009.03.029.