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Increase in soil stable carbon isotope ratio relates to loss of organic carbon: results from five long-term bare fallow experiments

  • Ecosystem ecology - Original research
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Abstract

Changes in the 12C/13C ratio (expressed as δ13C) of soil organic C (SOC) has been observed over long time scales and with depth in soil profiles. The changes are ascribed to the different reaction kinetics of 12C and 13C isotopes and the different isotopic composition of various SOC pool components. However, experimental verification of the subtle isotopic shifts associated with SOC turnover under field conditions is scarce. We determined δ13C and SOC in soil sampled during 1929–2009 in the Ap-horizon of five European long-term bare fallow experiments kept without C inputs for 27–80 years and covering a latitudinal range of 11°. The bare fallow soils lost 33–65 % of their initial SOC content and showed a mean annual δ13C increase of 0.008–0.024 ‰. The 13C enrichment could be related empirically to SOC losses by a Rayleigh distillation equation. A more complex mechanistic relationship was also examined. The overall estimate of the fractionation coefficient (ε) was −1.2 ± 0.3  ‰. This coefficient represents an important input to studies of long-term SOC dynamics in agricultural soils that are based on variations in 13C natural abundance. The variance of ε may be ascribed to site characteristics not disclosed in our study, but the very similar kinetics measured across our five experimental sites suggest that overall site-specific factors (including climate) had a marginal influence and that it may be possible to isolate a general mechanism causing the enrichment, although pre-fallow land use may have some impact on isotope abundance and fractionation.

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Acknowledgments

We want to thank D. Biliou for analyses of soils from the Versailles, Grignon and Kursk experiments. The Danish contribution was financially supported by the EU SmartSoil project. Analyses of the Versailles, Grignon and Kursk soils were supported by an INSU-CNRS project and by the GIS Climat Environnement Société Carbosoil project, under which the European long-term bare fallow network was created. N. Vasilyeva was supported by the Region Ile de France (R2DS). We are grateful to former colleagues for starting these experiments and keeping them running.

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Correspondence to Lorenzo Menichetti.

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Communicated by Hakan Wallander.

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Menichetti, L., Houot, S., van Oort, F. et al. Increase in soil stable carbon isotope ratio relates to loss of organic carbon: results from five long-term bare fallow experiments. Oecologia 177, 811–821 (2015). https://doi.org/10.1007/s00442-014-3114-4

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