High-pH and anoxic conditions during soil organic matter extraction increases its electron-exchange capacity and ability to stimulate microbial Fe(III) reduction by electron shuttling

Bai, Yuge; Subdiaga, Edisson; Haderlein, Stefan B.; Knicker, Heike; Kappler, Andreas

doi:https://doi.org/10.5194/bg-17-683-2020

Articles | Volume 17, issue 3

https://doi.org/10.5194/bg-17-683-2020

© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/bg-17-683-2020

© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 17, issue 3

Research article

|

10 Feb 2020

Research article |

| 10 Feb 2020

High-pH and anoxic conditions during soil organic matter extraction increases its electron-exchange capacity and ability to stimulate microbial Fe(III) reduction by electron shuttling

Yuge Bai, Edisson Subdiaga, Stefan B. Haderlein, Heike Knicker, and Andreas Kappler

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Final revised paper (published on 10 Feb 2020)
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Preprint (discussion started on 09 Sep 2019)
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Interactive discussion

Status: closed

AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment

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- Supplement

RC1: 'referee comment', Anonymous Referee #1, 02 Dec 2019
- AC1: 'responses to reviewer comments', Andreas Kappler, 09 Dec 2019
RC2: 'biogeochemistry', Anonymous Referee #2, 12 Dec 2019
- AC2: 'responses to reviewer's comments', Andreas Kappler, 12 Dec 2019

Peer-review completion

AR: Author's response | RR: Referee report | ED: Editor decision

ED: Reconsider after major revisions (13 Dec 2019) by Denise Akob

AR by Andreas Kappler on behalf of the Authors (20 Dec 2019)

ED: Publish as is (11 Jan 2020) by Denise Akob

AR by Andreas Kappler on behalf of the Authors (11 Jan 2020) Manuscript

Post-review adjustments

AA: Author's adjustment | EA: Editor approval

AA by Andreas Kappler on behalf of the Authors (31 Jan 2020) Author's adjustment Manuscript

EA: Adjustments approved (06 Feb 2020) by Denise Akob

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Short summary

Biogeochemical processes of SOM are key for greenhouse gas emission and water quality. We extracted SOM by water or by NaOH–HCl under oxic–anoxic conditions. Chemical and anoxic extractions lead to higher SOM electron exchange capacities, resulting in stimulation of microbial Fe(III) reduction. Therefore, aqueous pH-neutral SOM extracts should be used to reflect environmental SOM redox processes, and artifacts of chemical extractions need to be considered when evaluating SOM redox processes.