Preprints
https://doi.org/10.5194/egusphere-2024-1212
https://doi.org/10.5194/egusphere-2024-1212
30 Apr 2024
 | 30 Apr 2024

Role of nitrogen and iron biogeochemical cycles on the production and export of dissolved organic matter in agricultural headwater catchments

Thibault Lambert, Rémi Dupas, and Patrick Durand

Abstract. To obtain better constraints on the control of the seasonal variations on dissolved organic carbon (DOC) export in lowland catchments, we combined monitoring of nitrates, iron, soluble phosphorus and dissolved organic matter concentration (as DOC) and composition (fluorescence) in soil and stream waters at a regular interval during one hydrological cycle. We installed 21 zero-tension lysimeters in in top soil organic-rich soil horizons (15 cm below the soil surface) in the riparian area of a well-monitored agricultural catchment in French Brittany and visited them with a weekly to biweekly frequency from October 2022 to June 2023. We observed a large increase in DOC concentrations in riparian soils during the high flow period, notably due to the establishment of Fe-reducing conditions and the subsequent release of organic molecules in soil waters. We also noted that the timing and the spatial variability of Fe(II) biodissolution in soils was regulated by nitrates from agricultural origin and the heterogeneity of water flow paths at the catchment scale. Contrary to our current understanding of DOC export in headwater catchment, our results lead us to consider the winter high flow period as an active phase of both DOC production and export in headwater catchments.

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Journal article(s) based on this preprint

21 Oct 2024
The role of nitrogen and iron biogeochemical cycles in the production and export of dissolved organic matter in agricultural headwater catchments
Thibault Lambert, Rémi Dupas, and Patrick Durand
Biogeosciences, 21, 4533–4547, https://doi.org/10.5194/bg-21-4533-2024,https://doi.org/10.5194/bg-21-4533-2024, 2024
Short summary
Thibault Lambert, Rémi Dupas, and Patrick Durand

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2024-1212', Clayton Williams, 20 May 2024
  • RC2: 'Comment on egusphere-2024-1212', Anonymous Referee #2, 21 May 2024
  • RC3: 'Comment on egusphere-2024-1212', Benny Selle, 30 May 2024

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2024-1212', Clayton Williams, 20 May 2024
  • RC2: 'Comment on egusphere-2024-1212', Anonymous Referee #2, 21 May 2024
  • RC3: 'Comment on egusphere-2024-1212', Benny Selle, 30 May 2024

Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision | EF: Editorial file upload
ED: Reconsider after major revisions (12 Jul 2024) by Ji-Hyung Park
AR by Thibault Lambert on behalf of the Authors (16 Aug 2024)  Author's response   Author's tracked changes   Manuscript 
ED: Referee Nomination & Report Request started (23 Aug 2024) by Ji-Hyung Park
RR by Benny Selle (27 Aug 2024)
RR by Anonymous Referee #2 (28 Aug 2024)
ED: Publish subject to technical corrections (06 Sep 2024) by Ji-Hyung Park
AR by Thibault Lambert on behalf of the Authors (11 Sep 2024)  Author's response   Manuscript 

Journal article(s) based on this preprint

21 Oct 2024
The role of nitrogen and iron biogeochemical cycles in the production and export of dissolved organic matter in agricultural headwater catchments
Thibault Lambert, Rémi Dupas, and Patrick Durand
Biogeosciences, 21, 4533–4547, https://doi.org/10.5194/bg-21-4533-2024,https://doi.org/10.5194/bg-21-4533-2024, 2024
Short summary
Thibault Lambert, Rémi Dupas, and Patrick Durand
Thibault Lambert, Rémi Dupas, and Patrick Durand

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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
This study investigates the dissolved organic carbon (DOC) export in headwater catchment. Results show narrow links between DOC, nitrates and iron cycles along the year, calling into question our current conceptualization of DOC export at the catchment scale. Indeed, this study evidences that the winter period, commonly referred as a non-productive period in our current conceptual model, acts both as an active period of DOC production in riparian soils and DOC export toward stream waters.