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Biogeochemistry

, Volume 130, Issue 1–2, pp 1–12 | Cite as

The energetic and chemical signatures of persistent soil organic matter

  • Pierre Barré
  • Alain F. Plante
  • Lauric Cécillon
  • Suzanne Lutfalla
  • François Baudin
  • Sylvain Bernard
  • Bent T. Christensen
  • Thomas Eglin
  • Jose M. Fernandez
  • Sabine Houot
  • Thomas Kätterer
  • Corentin Le Guillou
  • Andy Macdonald
  • Folkert van Oort
  • Claire Chenu
Biogeochemistry Letters

Abstract

A large fraction of soil organic matter (OM) resists decomposition over decades to centuries as indicated by long radiocarbon residence times, but the mechanisms responsible for the long-term (multi-decadal) persistence are debated. The current lack of mechanistic understanding limits our ability to accurately predict soil OM stock evolution under climate and land-use changes. Using a unique set of historic soil samples from five long-term (27–79 years) bare fallow experiments, we demonstrate that despite wide pedo-climatic diversity, persistent OM shows specific energetic signatures, but no uniform chemical composition. From an energetic point of view, thermal analyses revealed that combustion of persistent OM occurred at higher temperature and provided less energy than combustion of more labile OM. In terms of chemical composition, persistent OM was H-depleted compared to OM present at the start of bare fallow, but spectroscopic analyses of OM functional groups did not reflect a consistent chemical composition of OM across sites, nor substantial modifications with bare fallow duration. The low energy content of persistent OM may be attributed to a combination of reduced content of energetic C–H bonds or stronger interactions between OM and the mineral matrix. Soil microorganisms thus appear to preferentially mineralize high-energy OM, leaving behind material with low energy content. This study provides the first direct link between long-term persistence of OM in soil and the energetic barriers experienced by the decomposer community.

Keywords

Carbon cycling Long-term bare fallow Rock–Eval 6 NEXAFS TG-DSC 

Notes

Acknowledgments

The INSU EC2CO program, ADEME and the ESF (MOLTER program) are acknowledged for financial support. We thank Rothamsted Research and the Lawes Agricultural Trust for access to archived samples and the BBSRC for support under the Institute National Capabilities programme grant (BBS/E/C/00005189). Related information and data can be found in the electronic Rothamsted Archive (era.rothamsted.ac.uk). The Danish contribution was financially supported by The Ministry of Food, Agriculture and Fisheries. NEXAFS data were acquired at the beamline11ID-1 at the CLS, which is supported by the NSERC, the CIHR, the NRC and the University of Saskatchewan. Special thanks go to Tom Regier for his expert support on the SGM-beamline at CLS. We also thank the reviewers for their helpful comments.

Supplementary material

10533_2016_246_MOESM1_ESM.docx (529 kb)
Supplementary material 1 (DOCX 529 kb)

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Copyright information

© Springer International Publishing Switzerland 2016

Authors and Affiliations

  • Pierre Barré
    • 1
  • Alain F. Plante
    • 2
  • Lauric Cécillon
    • 3
  • Suzanne Lutfalla
    • 1
    • 4
  • François Baudin
    • 5
  • Sylvain Bernard
    • 6
  • Bent T. Christensen
    • 7
  • Thomas Eglin
    • 8
  • Jose M. Fernandez
    • 2
  • Sabine Houot
    • 4
  • Thomas Kätterer
    • 9
  • Corentin Le Guillou
    • 10
  • Andy Macdonald
    • 11
  • Folkert van Oort
    • 4
  • Claire Chenu
    • 4
  1. 1.Laboratoire de Géologie de l’ENSPSL Research University – CNRS UMR8538ParisFrance
  2. 2.Earth and Environmental ScienceUniversity of PennsylvaniaPhiladelphiaUSA
  3. 3.UR EMGR, Université Grenoble Alpes, IrsteaSt-Martin-d’HèresFrance
  4. 4.UMR ECOSYS, INRA - AgroParisTech – Université Paris-SaclayThiverval GrignonFrance
  5. 5.Institut des Sciences de la Terre de ParisSorbonne Université-UPMC-Univ Paris 06ParisFrance
  6. 6.IMPMC, UMR7590, CNRS, MNHNParisFrance
  7. 7.Department of AgroecologyAarhus UniversityTjeleDenmark
  8. 8.Direction Productions et Energies Durables – Service Agriculture et Forêt, ADEMEAngersFrance
  9. 9.Department of EcologySwedish University of Agricultural SciencesUppsalaSweden
  10. 10.Unité matériaux et transformation (UMET), Université Lille1, CNRS - UMR8207Villeneuve d’AscqFrance
  11. 11.Department of Sustainable Soils and Grassland SystemsRothamsted ResearchHarpendenUK

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