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A Field Technique for Measuring 14CO2 Absorption by Excised or Intact Conifer Needles

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A small gas exchange chamber has been used to measure photosynthesis with 14C-labelled carbon dioxide on young Douglas-fir and Corsican pine needles exposed in four different ways: intact needles on the plantlet, needles left intact on an excised shoot, needles detached at the base, and cut portions of needles. A nonlinear adjustment of the light-response curve of photosynthesis has shown that at light saturation carbon dioxide absorption may be reduced by 35 percent if the needles are detached before the measurement. Excision of a shoot has no effect. Some advantages and drawbacks of the isotope method are discussed in connection with the variability of results obtained on trees. Forest Sci. 25:72-80.

Keywords: Corsican pine; Douglas-fir; Pinus nigra; Pseudotsuga menziesii; photosynthesis measurement

Document Type: Journal Article

Affiliations: Chargé de Recherches, I.N.R.A., Centre de Recherches Forestières d'Orléans, Station de Recherches sur la Forêt et l'Environnement, Ardon 45160 Olivet, France

Publication date: 1979-03-01

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

    Average time from submission to first decision: 62.5 days*
    June 1, 2016 to Feb. 28, 2017

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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