Preprints
https://doi.org/10.5194/egusphere-2022-1130
https://doi.org/10.5194/egusphere-2022-1130
03 Nov 2022
 | 03 Nov 2022

Elemental stoichiometry and Rock-Eval® thermal stability of organic matter in French topsoils

Amicie A. Delahaie, Pierre Barré, François Baudin, Dominique Arrouays, Antonio Bispo, Line Boulonne, Claire Chenu, Claudy Jolivet, Manuel P. Martin, Céline Ratié, Nicolas P. A. Saby, Florence Savignac, and Lauric Cécillon

Abstract. The quality and quantity of soil organic matter (SOM) are key elements of soil health and climate regulation by soils. The Rock-Eval® thermal analysis technique is increasingly used as it represents a powerful method for SOM characterization by providing insights on bulk SOM chemistry and thermal stability. In this study, we applied this technique on a large soil sample set from the first campaign (2000–2009) of the French monitoring network of soil quality: RMQS. Based on our analyses on ca. 2000 composite surface (0–30 cm) samples taken all over mainland France, we observed a significant impact of land cover on both SOM thermal stability and elemental stoichiometry. Cropland soils had a lower mean value of hydrogen index (a proxy for SOM H / C ratio) and a higher thermal stability than grasslands and forests. Regarding the oxygen index (a proxy for SOM O / C ratio), we observed significant differences in values for croplands, grasslands and forests. Positive correlations between the temperature parameters on the one hand and the clay content and pH on the other hand highlight the protective effect of clay on organic matter and the impact of pH on microorganisms mineralization activity. Surprisingly, we found weak effects of climatic parameters on the thermal stability and stoichiometry of SOM. Our data suggest that topsoil SOM is on average more oxidized and biogeochemically stable in croplands. More generally, the high number and even repartition of data on the whole French territory allow to build a national interpretative referential for these indicators in surface soils.

Journal article(s) based on this preprint

02 May 2023
Elemental stoichiometry and Rock-Eval® thermal stability of organic matter in French topsoils
Amicie A. Delahaie, Pierre Barré, François Baudin, Dominique Arrouays, Antonio Bispo, Line Boulonne, Claire Chenu, Claudy Jolivet, Manuel P. Martin, Céline Ratié, Nicolas P. A. Saby, Florence Savignac, and Lauric Cécillon
SOIL, 9, 209–229, https://doi.org/10.5194/soil-9-209-2023,https://doi.org/10.5194/soil-9-209-2023, 2023
Short summary

Amicie A. Delahaie et al.

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2022-1130', Anonymous Referee #1, 10 Jan 2023
    • AC2: 'Reply on RC1', Amicie Delahaie, 07 Feb 2023
  • RC2: 'Comment on egusphere-2022-1130', Anonymous Referee #2, 25 Jan 2023
    • AC1: 'Reply on RC2', Amicie Delahaie, 02 Feb 2023

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2022-1130', Anonymous Referee #1, 10 Jan 2023
    • AC2: 'Reply on RC1', Amicie Delahaie, 07 Feb 2023
  • RC2: 'Comment on egusphere-2022-1130', Anonymous Referee #2, 25 Jan 2023
    • AC1: 'Reply on RC2', Amicie Delahaie, 02 Feb 2023

Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision | EF: Editorial file upload
ED: Publish subject to minor revisions (review by editor) (11 Feb 2023) by Jocelyn Lavallee
AR by Amicie Delahaie on behalf of the Authors (20 Feb 2023)  Author's response   Author's tracked changes   Manuscript 
ED: Publish as is (28 Feb 2023) by Jocelyn Lavallee
ED: Publish as is (09 Mar 2023) by Kristof Van Oost (Executive editor)
AR by Amicie Delahaie on behalf of the Authors (15 Mar 2023)  Author's response   Manuscript 

Journal article(s) based on this preprint

02 May 2023
Elemental stoichiometry and Rock-Eval® thermal stability of organic matter in French topsoils
Amicie A. Delahaie, Pierre Barré, François Baudin, Dominique Arrouays, Antonio Bispo, Line Boulonne, Claire Chenu, Claudy Jolivet, Manuel P. Martin, Céline Ratié, Nicolas P. A. Saby, Florence Savignac, and Lauric Cécillon
SOIL, 9, 209–229, https://doi.org/10.5194/soil-9-209-2023,https://doi.org/10.5194/soil-9-209-2023, 2023
Short summary

Amicie A. Delahaie et al.

Amicie A. Delahaie et al.

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The requested preprint has a corresponding peer-reviewed final revised paper. You are encouraged to refer to the final revised version.

Short summary
We characterized organic matter in French soils by analyzing the samples of the French RMQS using Rock-Eval thermal analysis. This study demonstrates that thermal analysis is appropriate to characterize large set of samples (~2000) and provides interpretation references for Rock-Eval parameter values. It shows that organic matter in managed soils is on average more oxidized and more thermally stable and that some Rock-Eval parameters are good proxies of organic matter biogeochemical stability.