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

Biogeosciences, 17, 683–698, 2020

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

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

Biogeosciences, 17, 683–698, 2020

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 et al.

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Final revised paper (published on 10 Feb 2020)
Supplement to the final revised paper
Preprint (discussion started on 09 Sep 2019)
Supplement to the preprint

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 Anna Wenzel on behalf of the Authors (08 Jan 2020) Author's response

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

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

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.