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The Contribution of Aspen Bark Photosynthesis to the Energy Balance of the Stem

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The total annual CO2 assimilation of Populus tremuloides was similar to evergreen tree foliage when expressed on a surface area basis. Of the annual total 2650 mg CO2dm² assimilated by the bark tissue, 27 percent was fixed during the months of March through May; 59 percent, June through August; 10 percent, September through November; and 4 percent, December through February. Canopy shading reduced CO2 fixation during the summer months, at a time when stem respiration was at its peak. When provided with artificial illumination, corticular photosynthesis reached a maximum of 9-12 mg CO2dm² hr. When leaves are absent, corticular photosynthesis is able to contribute significantly to the carbohydrate supply of the aspen stem. Forest Sci. 24: 569-573.

Keywords: Populus tremuloides; carbon balance

Document Type: Journal Article

Affiliations: College of Environmental Science and Forestry, Syracuse, NY 13210

Publication date: December 1, 1978

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.

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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