Dynamics of soil organic matter based on new Rock-Eval indices

D. Sebag, E. P. Verrecchia, L. Cécillon, T. Adatte, R. Albrecht, M. Aubert, F. Bureau, G. Cailleau, Y. Copard, T. Decaens, J. R. Disnar, M. Hetényi, T. Nyilas, L. Trombino

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

This paper aims to develop a new approach to interpret soil organic matter (SOM) dynamics from Rock-Eval pyrolysis. Rock-Eval standard parameters (TpS2, HI, OI) are limited when applied to SOM, as they were defined for tracking the origin of sedimentary organic matter (i.e. terrestrial vs aquatic and lacustrine vs marine). This study proposes new Rock Eval based indices, projected on a new diagram plotting > 1300 samples, including litter and soil horizons, pure compounds and organic material. These new parameters reflect the thermal stability of SOM rather than its bulk chemistry. Their calculations are based on the contribution of four different areas (A1 to A4) integrated below the S2 pyrogram (amounts of released hydrocarbon compounds during the pyrolysis step). Results demonstrate that the relative values of A1 to A4 parameters can be used to survey the evolution of SOM during pedogenesis. These Rock-Eval parameters revealed a consistent thermal differentiation of SOM with depth, from thermally labile biogenic SOM in soil organic horizons to thermally stable mineral-associated SOM compounds in organo-mineral and mineral soil horizons, indicating a pedogenetic stabilization of SOM. Finally, newly defined I- and R-indices integrate the respective parts of A1 to A4 parameters into SOM dynamics, the I-index emphasizing the degree of transformation of the immature organic fraction (related to SOM stabilization), the R-index highlighting the contribution of the most refractory fraction or persistent SOM (related to pedogenic and inherited contributions). Analyses of a wide range of soils and reference samples (cellulose, lignin, humic substances, lignite, charcoal, coal, etc.) allow end-members as well as particular trends (humic, spodic, inherited) to be drawn. Specific examples are provided in order to illustrate some applications and uses for this new Rock-Eval based I/R diagram, from the study of grain size fractions to the evolution of SOM in soil chronosequences.

Original languageEnglish
Pages (from-to)185-203
Number of pages19
JournalGeoderma
Volume284
DOIs
Publication statusPublished - Dec 15 2016

Fingerprint

soil organic matter
rocks
rock
soil horizon
pyrolysis
soil horizons
index
stabilization
mineral
diagram
minerals
reference sample
lignite
soil
organic horizons
pedogenesis
chronosequence
humic substances
chronosequences
humic substance

Keywords

  • Decomposition
  • Geochemistry
  • Pedogenesis
  • Rock-Eval pyrolysis
  • Soil organic matter
  • Stabilization

ASJC Scopus subject areas

  • Soil Science

Cite this

Sebag, D., Verrecchia, E. P., Cécillon, L., Adatte, T., Albrecht, R., Aubert, M., ... Trombino, L. (2016). Dynamics of soil organic matter based on new Rock-Eval indices. Geoderma, 284, 185-203. https://doi.org/10.1016/j.geoderma.2016.08.025

Dynamics of soil organic matter based on new Rock-Eval indices. / Sebag, D.; Verrecchia, E. P.; Cécillon, L.; Adatte, T.; Albrecht, R.; Aubert, M.; Bureau, F.; Cailleau, G.; Copard, Y.; Decaens, T.; Disnar, J. R.; Hetényi, M.; Nyilas, T.; Trombino, L.

In: Geoderma, Vol. 284, 15.12.2016, p. 185-203.

Research output: Contribution to journalArticle

Sebag, D, Verrecchia, EP, Cécillon, L, Adatte, T, Albrecht, R, Aubert, M, Bureau, F, Cailleau, G, Copard, Y, Decaens, T, Disnar, JR, Hetényi, M, Nyilas, T & Trombino, L 2016, 'Dynamics of soil organic matter based on new Rock-Eval indices', Geoderma, vol. 284, pp. 185-203. https://doi.org/10.1016/j.geoderma.2016.08.025
Sebag D, Verrecchia EP, Cécillon L, Adatte T, Albrecht R, Aubert M et al. Dynamics of soil organic matter based on new Rock-Eval indices. Geoderma. 2016 Dec 15;284:185-203. https://doi.org/10.1016/j.geoderma.2016.08.025
Sebag, D. ; Verrecchia, E. P. ; Cécillon, L. ; Adatte, T. ; Albrecht, R. ; Aubert, M. ; Bureau, F. ; Cailleau, G. ; Copard, Y. ; Decaens, T. ; Disnar, J. R. ; Hetényi, M. ; Nyilas, T. ; Trombino, L. / Dynamics of soil organic matter based on new Rock-Eval indices. In: Geoderma. 2016 ; Vol. 284. pp. 185-203.
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