Articles | Volume 15, issue 22
Atmos. Chem. Phys., 15, 13003–13021, 2015
Atmos. Chem. Phys., 15, 13003–13021, 2015

Research article 24 Nov 2015

Research article | 24 Nov 2015

Isotopic signatures of production and uptake of H2 by soil

Q. Chen et al.

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Cited articles

Batenburg, A. M., Walter, S., Pieterse, G., Levin, I., Schmidt, M., Jordan, A., Hammer, S., Yver, C., and Röckmann, T.: Temporal and spatial variability of the stable isotopic composition of atmospheric molecular hydrogen: observations at six EUROHYDROS stations, Atmos. Chem. Phys., 11, 6985–6999,, 2011.
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Bottinga, Y.: Calculated fractionation factors for carbon and hydrogen isotope exchange in the system calcite-carbon dioxide-graphite-methane-hydrogen-water vapour, Geochim. Cosmochim. Ac., 33, 49–64,, 1969.
Conrad, R.: Compensation concentration as critical variable for regulating the flux of trace gases between soil and atmosphere, Biogeochemistry, 27, 155–170,, 1994.
Short summary
We investigated soil production and uptake of H2 and associated isotope effects. Uptake and emission of H2 occurred simultaneously at all sampling sites, with strongest emission where N2 fixing legume was present. The fractionation constant during soil uptake was about 0.945 and it did not show positive correlation with deposition velocity. The isotopic composition of H2 emitted from soil with legume was about -530‰, which is less deuterium-depleted than isotope equilibrium between H2O and H2.
Final-revised paper