Preprints
https://doi.org/10.5194/egusphere-2024-3883
https://doi.org/10.5194/egusphere-2024-3883
18 Dec 2024
 | 18 Dec 2024

A simple model of the turnover of organic carbon in a soil profile: model test, parameter identification and sensitivity

Elsa Coucheney, Anke Marianne Herrmann, and Nicholas Jarvis

Abstract. Simulation models are potentially useful tools to test our understanding of the processes involved in the turnover of soil organic carbon (SOC) and to evaluate the role of management practices in maintaining stocks of SOC. We describe here a simple model of SOC turnover at the soil profile scale that accounts for two key processes determining SOC persistence (i.e. microbial energy limitation and physical protection due to soil aggregation). We tested the model and evaluated the identifiability of key parameters using topsoil SOC contents measured in three treatments with contrasting organic matter inputs (i.e. fallow, mineral fertilized and cropped, with and without straw addition) in a long-term field trial. The estimated total input of organic matter (OM) in the treatment with straw added was roughly three times that of the treatment without straw addition, but only 12 % of the additional OM input remained in the soil after 54 years. By taking microbial energy limitation and enhanced physical protection of root residues into account, the model could explain the differences in C persistence among the three treatments, whilst also accurately matching the time-courses of SOC contents using the same set of model parameters. Models that do not explicitly consider microbial energy limitation and physical protection would need to adjust their parameter values (either decomposition rate constants or the retention coefficient) to match this data.

We also performed a sensitivity analysis to identify the most influential parameters in the model determining soil profile stocks of OM at steady-state. Input distributions for soil and crop parameters in the model were defined for the agricultural production area of PO4 (east-central Sweden), which includes Uppsala. The resulting model predictions compared well with aggregated soil survey data for the PO4 region. This analysis showed that model parameters affecting SOC decomposition rates, including the rate constant for microbial-processed SOC and the parameters regulating physical protection and microbial energy limitation, are more sensitive than parameters determining OM inputs. Thus, the development of pedotransfer approaches to estimate SOC decomposition rates from soil properties would help to support predictive applications of the model at larger spatial scales.

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Journal article(s) based on this preprint

01 Oct 2025
A simple model of the turnover of organic carbon in a soil profile: model test, parameter identification and sensitivity
Elsa Coucheney, Anke Marianne Herrmann, and Nicholas Jarvis
SOIL, 11, 715–733, https://doi.org/10.5194/soil-11-715-2025,https://doi.org/10.5194/soil-11-715-2025, 2025
Short summary
Elsa Coucheney, Anke Marianne Herrmann, and Nicholas Jarvis

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2024-3883', Anonymous Referee #1, 27 Feb 2025
  • RC2: 'Comment on egusphere-2024-3883', Anonymous Referee #2, 11 Mar 2025

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2024-3883', Anonymous Referee #1, 27 Feb 2025
  • RC2: 'Comment on egusphere-2024-3883', Anonymous Referee #2, 11 Mar 2025

Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision | EF: Editorial file upload
ED: Publish subject to revisions (further review by editor and referees) (10 Apr 2025) by Marijn van der Meij
AR by Elsa Coucheney on behalf of the Authors (05 May 2025)  Author's response   Author's tracked changes   Manuscript 
ED: Referee Nomination & Report Request started (08 May 2025) by Marijn van der Meij
RR by Anonymous Referee #3 (11 Jul 2025)
ED: Publish subject to minor revisions (review by editor) (11 Jul 2025) by Marijn van der Meij
AR by Elsa Coucheney on behalf of the Authors (23 Jul 2025)  Author's response   Author's tracked changes   Manuscript 
ED: Publish subject to technical corrections (28 Jul 2025) by Marijn van der Meij
ED: Publish subject to technical corrections (30 Jul 2025) by Rémi Cardinael (Executive editor)
AR by Elsa Coucheney on behalf of the Authors (14 Aug 2025)  Manuscript 

Journal article(s) based on this preprint

01 Oct 2025
A simple model of the turnover of organic carbon in a soil profile: model test, parameter identification and sensitivity
Elsa Coucheney, Anke Marianne Herrmann, and Nicholas Jarvis
SOIL, 11, 715–733, https://doi.org/10.5194/soil-11-715-2025,https://doi.org/10.5194/soil-11-715-2025, 2025
Short summary
Elsa Coucheney, Anke Marianne Herrmann, and Nicholas Jarvis
Elsa Coucheney, Anke Marianne Herrmann, and Nicholas Jarvis

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Short summary
Simulation models can be used to evaluate changes in soil organic carbon (SOC) stocks in agricultural soils that are important to soil health and climate change mitigation. We describe a simple model that considers SOC turnover in a soil profile regulated by two processes: physical protection due to aggregation and microbial energy limitation. It accurately reproduces trends in SOC in plots receiving different OC inputs and matches survey data on SOC in the soil profile in one region of Sweden.
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