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生态学杂志 ›› 2009, Vol. 28 ›› Issue (11): 2233-2238.

• 研究报告 • 上一篇    下一篇

光合作用对胞间和大气CO2响应曲线的比较

叶子飘1,2**;于强3   

  1. 1井冈山大学井冈山生态环境研究中心, 江西吉安 343009;2井冈山大学数理学院,江西吉安 343009;3中国科学院地理科学与资源研究所,北京 100101
  • 出版日期:2009-11-10 发布日期:2009-11-10

A comparison of response curves of winter wheat photosynthesis to flag leaf intercellular and air CO2 concentrations.

YE Zi-piao1,2;YU Qiang3   

  1. 1Research Center for Jinggangshan Eco Environmental Sciences, Jinggangshan University, Ji’an 343009, Jiangxi, China|2College of Sciences, Jinggangshan University, Ji’an 343009, Jiangxi, China|3Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
  • Online:2009-11-10 Published:2009-11-10

摘要: 利用Li-6400便携式光合作用系统测定华北平原冬小麦在温度为25 ℃和30 ℃、光合有效辐射为1500和2000 mmol·m-2·s-1条件下处于抽穗时期旗叶的CO2响应曲线,研究植物光合作用对胞间CO2响应(A/Ci)和对大气CO2响应(A/Ca)的直角双曲线修正模型所给拟合结果的合理性。结果表明:由A/CiA/Ca修正模型所给的光合能力和CO2补偿点几乎相同,但得到的光呼吸速率和初始羧化效率则完全不等;产生这种差异的原因是利用叶片气体交换测定的数据所计算的胞间CO2浓度并不是植物叶片本身的胞间CO2浓度;A/Ca修正模型比A/Ci修正模型更为合理是因为A/Ca所估算的光呼吸速率接近测量值。

关键词: 叶面积指数, 叶绿素含量, MODIS植被指数, 相关分析

Abstract: By using Li6400 portable photosynthesis system, the photosynthetic parameters of winter wheat (Triticum aestivum) during its heading stage in North China Plain were measured at air temperature 25 ℃ and 30 ℃ and at photosynthetically available radiation 1500 and 2000 mmol·m-2·s-1. The measured data were fitted with the modified rectangular hyperbola models of the photosynthetic responses to flag leaf intercellular CO2 concentration (A/Ci) and air CO2 concentration (A/Ca), aimed to approach the reasonability of the fitted results obtained from the models. The photosynthetic capacity and CO2 compensation point estimated by the modified A/Ci curve and A/Ca curve were nearly the same, but the photorespiration and initial carboxylation efficiency estimated by them were completely different. The difference between the two modified curves came from the calculated but not the real intercellular CO2 concentration. Modified A/Ca curve was more reasonable than the modified A/Ci curve, because the potorespiration rate estimated by the former was close to the measured value.

Key words: LAI, Chlorophyll content, MODIS VI, Correlation analysis