Carbon Fate, Iron Dissolution, and Molecular Characterization of Dissolved Organic Matter in Thawed Yedoma Permafrost under Varying Redox Conditions
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Le résumé fourni par la source
Permafrost soils store ∼50% of terrestrial C, with Yedoma permafrost containing ∼25% of the total C. Permafrost is undergoing degradation due to thawing, with potentially hazardous effects on landscape stability and water resources. Complicating ongoing efforts to project the ultimate fate of deep permafrost C is the poorly constrained role of the redox environment, Fe-minerals, and its redox-active phases, which may modulate organic C-abundance, composition, and reactivity through complexation and catalytic processes. We characterized C fate, Fe fractions, and dissolved organic matter (DOM) isolates from permafrost-thaw under varying redox conditions. Under anoxic incubation conditions, 33% of the initial C was lost as gaseous species within 21 days, while under oxic conditions, 58% of C was lost. Under anoxic incubation, 42% of the total initial C was preserved in a dissolved fraction. Lignin-like compounds dominated permafrost-thaw, followed by lipid- and protein-like compounds. However, under anoxic incubation conditions, there was accumulation of lipid-like compounds and reduction in the nominal oxidation state of C over time, regardless of the compound classes. DOM dynamics may be affected by microbial activity and abiotic processes mediated by Fe-minerals related to selective DOM fractionation and/or its oxidation. Chemodiversity DOM signatures could serve as valuable proxies to track redox conditions with permafrost-thaw.
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Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé ; titre concordant.
- Titre Crossref
- Carbon Fate, Iron Dissolution, and Molecular Characterization of Dissolved Organic Matter in Thawed Yedoma Permafrost under Varying Redox Conditions
- Date Crossref
- 22/02/2024
- Éditeur
- American Chemical Society (ACS)
- Type
- journal-article
Ce recoupement confirme des métadonnées liées au DOI. Il ne confirme ni la méthode ni les conclusions de l’étude, et il ne compte pas comme une seconde source scientifique indépendante.
Où se fait cette recherche
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University of Delaware Department of Plant & Soil Sciences pays non établi dans la noticeUniversité ou école supérieure
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University of Southern California Department of Earth Sciences pays non établi dans la noticeUniversité ou école supérieure
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Old Dominion University Department of Chemistry and Biochemistry pays non établi dans la noticeUniversité ou école supérieure
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Environmental Protection Agency Office of Research and Development pays non établi dans la noticeOrganisme public
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Research Triangle Park Foundation pays non établi dans la noticeOrganisation à but non lucratif
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Agricultural Research Service pays non établi dans la noticeOrganisme public
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Cold Regions Research and Engineering Laboratory pays non établi dans la noticeStructure de recherche
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United States Army pays non établi dans la noticeOrganisme public
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Texas A&M University Hagler Institute Fellow pays non établi dans la noticeUniversité ou école supérieure
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USDA-ARS: Sustainable Agriculture Systems Lab pays non établi dans la noticeStructure de recherche
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U.S. Army Cold Regions Research & Engineering Laboratory pays non établi dans la noticeStructure de recherche
Department of Plant & Soil Sciences — University of Delaware, Department of Earth Sciences — University of Southern California et Department of Chemistry and Biochemistry — Old Dominion University, avec 8 autres affiliations.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.