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Carbon isotope measurements in soil CO 2 are presented and discussed. Soil CO 2 concentration and 13 C profiles were measured using a new technique. A simple model describing the CO 2 transport from the soil to the atmosphere is derived. The finding that CO 2 in the soil is richer in 13 C than the CO 2 leaving the soil is attributed to isotopic fractionation in molecular diffusion.
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Dörr et al. (1980) studied this question.
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