Iron-mediated organic matter decomposition in humid soils can counteract protection

dc.contributor.author Chen, Chunmei
dc.contributor.author Hall, Steven
dc.contributor.author Coward, Elizabeth
dc.contributor.author Thompson, Aaron
dc.contributor.department Ecology, Evolution and Organismal Biology
dc.date 2020-05-13T13:31:41.000
dc.date.accessioned 2020-06-30T02:18:43Z
dc.date.available 2020-06-30T02:18:43Z
dc.date.copyright Wed Jan 01 00:00:00 UTC 2020
dc.date.issued 2020-05-07
dc.description.abstract <p>Soil organic matter (SOM) is correlated with reactive iron (Fe) in humid soils, but Fe also promotes SOM decomposition when oxygen (O2) becomes limited. Here we quantify Fe-mediated OM protection vs. decomposition by adding 13C dissolved organic matter (DOM) and 57FeII to soil slurries incubated under static or fluctuating O2. We find Fe uniformly protects OM only under static oxic conditions, and only when Fe and DOM are added together: de novo reactive FeIII phases suppress DOM and SOM mineralization by 35 and 47%, respectively. Conversely, adding 57FeII alone increases SOM mineralization by 8% following oxidation to 57FeIII. Under O2 limitation, de novo reactive 57FeIII phases are preferentially reduced, increasing anaerobic mineralization of DOM and SOM by 74% and 32‒41%, respectively. Periodic O2 limitation is common in humid soils, so Fe does not intrinsically protect OM; rather reactive Fe phases require their own physiochemical protection to contribute to OM persistence.</p>
dc.description.comments <p>This article is published as Chen, C., Hall, S.J., Coward, E. <em>et al.</em> Iron-mediated organic matter decomposition in humid soils can counteract protection. <em>Nat Commun</em> 11, 2255 (2020). doi: <a href="https://doi.org/10.1038/s41467-020-16071-5">10.1038/s41467-020-16071-5</a>.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/eeob_ag_pubs/402/
dc.identifier.articleid 1408
dc.identifier.contextkey 17724476
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath eeob_ag_pubs/402
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/23288
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/eeob_ag_pubs/402/2020_Hall_IronMediatedOrganic.pdf|||Sat Jan 15 00:08:02 UTC 2022
dc.source.uri 10.1038/s41467-020-16071-5
dc.subject.disciplines Biogeochemistry
dc.subject.disciplines Climate
dc.subject.disciplines Ecology and Evolutionary Biology
dc.subject.disciplines Soil Science
dc.title Iron-mediated organic matter decomposition in humid soils can counteract protection
dc.type article
dc.type.genre article
dspace.entity.type Publication
relation.isAuthorOfPublication 3f4318fa-b172-4017-b69d-49d5e3607c4f
relation.isOrgUnitOfPublication 6fa4d3a0-d4c9-4940-945f-9e5923aed691
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