On the isotopic composition of carbon in soil carbon dioxide

Details On the isotopic composition of carbon in soil carbon dioxide On the isotopic composition of carbon in soil carbon dioxide

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991gecoa..55.3403c&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 55, Issue 11, pp.3403-3405

Computer Science

51

Scientific paper

In this study it is shown that the isotopic composition of carbon in soil CO 2 differs from the isotopic composition of carbon in soil-respired CO 2 . Soil CO 2 collected from a montane soil has an endmember 13 C value of -23.3%. whereas soil-respired CO 2 in this system has a 13 C value of -27.5%. This difference is very close to the theoretical difference of 4.4%. which is predicted by the difference in the diffusion coefficients for 12 CO 2 and 13 CO 2 . Because of the measured and the theoretical difference between the isotopic composition of carbon in soil CO 2 and soil-respired CO 2 it is suggested that, in the future, a distinction should be made between them.

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