Preprints
https://doi.org/10.5194/soil-2021-3
https://doi.org/10.5194/soil-2021-3

  15 Mar 2021

15 Mar 2021

Review status: a revised version of this preprint was accepted for the journal SOIL and is expected to appear here in due course.

Soil organic carbon mobility in equatorial podzols: soil column experiments

Patrica Merdy1, Yves Lucas1, Bruno Coulomb2, Adolpho J. Melfi3, and Célia R. Montes3 Patrica Merdy et al.
  • 1Université de Toulon, Aix Marseille Université, CNRS, IM2NP, 83041 Toulon CEDEX 9, France
  • 2Aix Marseille Université, CNRS, LCE, Marseille, France
  • 3IEE, NUPEGEL, Universidade de São Paulo, São Paulo 05508-010, Brazil

Abstract. Transfer of organic carbon from topsoil horizons to deeper horizons and to water table is still little documented, in particular in equatorial environments despite the high primary productivity of the evergreen forest. Due to its complexing capacity, organic carbon also plays a key role in the transfer of metals in the soil profile and therefore in pedogenesis and for metal mobility. We were interested in equatorial podzols, which are known to play a significant role in carbon cycling. We carried out soil column experiments using soil material and percolating solution sampled in an Amazonian podzol area. The dissolved organic matter (DOM) produced in the topsoil was not able to percolate through the clayey, kaolinitic material from the deep horizons and was retained in it. When it previously percolated through the Bh material, there was production of fulvic-like, protein-like compounds and small carboxylic acids able to percolate through the clayey material and increasing the mobility of Al, Fe and Si. Podzolic processes in the Bh can therefore produce a DOM likely to be transferred to the deep water table, playing a role in the carbon balances at the profile scale, and owing to its complexing capacity, playing a role in deep horizon pedogenesis and weathering. The order of magnitude of carbon concentration in the solution percolating in depth was around 1.5–2.5 mg L−1.

Patrica Merdy et al.

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • CC1: 'Comment on soil-2021-3', Michel Brossard, 04 May 2021
  • RC1: 'Comment on soil-2021-3', Anonymous Referee #1, 05 May 2021
    • AC1: 'Reply on RC1', Patricia Merdy, 29 Jun 2021
  • CC2: 'Response to comments and review on soil-2021-3', Yves Lucas, 19 May 2021
  • RC2: 'Comment on soil-2021-3', Anonymous Referee #2, 23 Jun 2021
    • AC2: 'Reply on RC2', Patricia Merdy, 29 Jun 2021

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • CC1: 'Comment on soil-2021-3', Michel Brossard, 04 May 2021
  • RC1: 'Comment on soil-2021-3', Anonymous Referee #1, 05 May 2021
    • AC1: 'Reply on RC1', Patricia Merdy, 29 Jun 2021
  • CC2: 'Response to comments and review on soil-2021-3', Yves Lucas, 19 May 2021
  • RC2: 'Comment on soil-2021-3', Anonymous Referee #2, 23 Jun 2021
    • AC2: 'Reply on RC2', Patricia Merdy, 29 Jun 2021

Patrica Merdy et al.

Patrica Merdy et al.

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Short summary
Transfer of organic carbon from topsoil to deeper horizons and to water table is little documented, especially in equatorial environments despite high primary productivity of the evergreen forest. Using column experiments with podzol soil and percolating solution sampled in an Amazonian podzol area, we showed how C-rich Bh horizon plays a major role on natural organic matter transfer and Si, Fe, Al mobility after a kaolinitic layer transition, thus giving insight in genesis of tropical podzol.