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An explanation of 13C/12C variations in tree rings

Nature volume 297, pages 28–31 (1982)Cite this article

Abstract

Variations in the 13C/12C ratio in trees are examined in the light of a simple expression relating the relative isotope composition of plant material, δp13 to δa13, the atmospheric isotope value, ca, the atmospheric CO2 concentration and ci, the internal concentration of CO2 in leaves. The expression gives good agreement with δp13 measurements where independent information on ci exists, such as seasonal growth, growth low in the canopy and in conditions of low humidity. The expression provides possible explanations for two previously unexplained phenomena: the absence of anticipated changes due to fossil fuel-induced changes in δa13, and regional differences in δp13 trends.

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Authors and Affiliations

  1. CSIRO Division of Atmospheric Physics, Aspendale, Victoria, Australia, 3195

    R. J. Francey

  2. Department of Environmental Biology, Research School of Biological Sciences, Australian National University, PO Box 475, Canberra City, ACT, Australia, 2601

    G. D. Farquhar

Authors
  1. R. J. Francey
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  2. G. D. Farquhar
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Francey, R., Farquhar, G. An explanation of 13C/12C variations in tree rings. Nature 297, 28–31 (1982). https://doi.org/10.1038/297028a0

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