Tracing carbon uptake from a natural CO2 spring into tree rings: an isotope approach.

@article{Saurer2003TracingCU,
  title={Tracing carbon uptake from a natural CO2 spring into tree rings: an isotope approach.},
  author={Matthias Saurer and Paolo Cherubini and Georges Bonani and Rolf T. W. Siegwolf},
  journal={Tree physiology},
  year={2003},
  volume={23 14},
  pages={
          997-1004
        }
}
We analyzed 14C, 13C and 18O isotope variations over a 50-year period in tree rings of Quercus ilex L. trees growing at a natural CO2 spring in a Mediterranean ecosystem. We compared trees from two sites, one with high and one with low exposure to CO2 from the spring. The spring CO2 is free of 14C. Thus, this carbon can be traced in the wood, and the amount originating from the spring calculated. The amount decreased over time, from about 40% in 1950 to 15% at present for the site near the… 

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