Modelling carbon isotope fractionation in tree rings based on effective evapotranspiration and soil water status

J. ‐L DUPOUEY, S. LEAVITT, E. CHOISNEL, S. JOURDAIN

Research output: Contribution to journalArticle

114 Scopus citations

Abstract

Environmental influences on carbon isotope fractionation in tree rings require further elucidation in order to use this parameter as a biological marker of climatic variations. δ13C values in tree‐ring cellulose of beech (Fagus sylvatica L.) were analysed for the period from 1950 to 1990. A bioclimatic model of water balance was used to give the actual evapotranspiration as well as the soil water content on a daily basis. δ13C shows a significant decrease from –24·5‰ to –25‰ over this period. Internal CO2 concentration changes from 200 to 220 ppm in relation with the rise of atmospheric CO2. Beside a slight non‐significant inter‐individual variation, a large year‐to‐year variation exists. The relative extractable soil water of July, combined with the value of δ13C for the previous year, predicts as much as 70% of this variance. Air temperature or precipitation accounted for less variation. δ13C is strongly correlated with basal area increment, but appeared a more reliable indicator of water status at the stand level.

Original languageEnglish (US)
Pages (from-to)939-947
Number of pages9
JournalPlant, Cell & Environment
Volume16
Issue number8
DOIs
StatePublished - Nov 1993

Keywords

  • Fagus sylvatica L.: Fagaceae
  • beech
  • greenhouse effect
  • internal CO concentration
  • tree ring
  • water balance model
  • δ C

ASJC Scopus subject areas

  • Physiology
  • Plant Science

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