HIGHLIGHTS
SUMMARY
The relationship between climate and stable isotope signature of wood is well-defined by an existing model of oxygen isotopic fractionation (Gagen et_al 2011). The enrichment or depletion of the source water in heavier stable isotopes occurs first as a result of evaporation and condensation taking place in the vicinity of the tree. Because lighter isotopes evaporate faster, the source water is therefore relatively enriched in heavier isotopes. Because organic carbon is derived from atmospheric carbon_dioxide, the content of carbon isotopes in wood is therefore determined by the intensity of stomatal conductance and photosynthesis . . .
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