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Photosynthesis and Photorespiration in Douglas-fir as Influenced by Irradiance, CO2 Concentration, and Temperature

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Gas exchange of Douglas-fir (Pseudotsuga menziesii [Mirb.] Franco) was studied using an infrared gas analyzer with a closed system. Apparent photorespiration was estimated from the extrapolation of apparent photosynthesis to zero CO2 concentration and light respiration was derived from the post-illumination burst of CO2. Apparent photosynthesis increased with increasing irradiance and CO2 concentration and had a temperature optimum range of 10°-15°C. Apparent photorespiration increased with increasing irradiance and temperature. Light respiration increased with increasing irradiance, increasing temperature, and decreasing CO2 concentration. Values obtained from the difference between apparent photorespiration and light respiration suggest that photosynthetic refixation of photorespired CO2 increases with increasing temperature and that in the light at 5°C dark respiration contributes appreciable amounts of CO2, but this contribution decreases at higher temperatures. Forest Sci. 27:641-650.

Keywords: Pseudotsuga menziesii; dark respiration; post-illumination burst

Document Type: Journal Article

Affiliations: Professor of Botany, University of Washington, Seattle, Washington 98195

Publication date: 1981-12-01

More about this publication?
  • Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    2015 Impact Factor: 1.702
    Ranking: 16 of 66 in forestry

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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