Episodic drought and flooding impacts on the destabilization of mineral-associated organic matter in the rhizosphere
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Le résumé fourni par la source
The majority of soil carbon resides in mineral-associated organic matter (MAOM) in most soils. MAOM is assumed to be relatively inert to environmental change because it is protected from microbial activity thus contributing substantially to soil carbon storage. However, plants and associated microbes may destabilize MAOM through mineral dissolution and exchange reactions in the rhizosphere, potentially causing soil carbon loss. Here, we quantified the magnitude of MAOM destabilization in the rhizosphere in response to extreme precipitation dynamics expected with climate change. To do this, we followed the fate of labeled MAOM (13C microbial necromass adsorbed to iron minerals: goethite or ferrihydrite) in the wheat (Triticum aestivum L.) rhizosphere during a 12-week pot experiment subjected to precipitation regimes mimicking the status quo (optimal conditions) as well as extreme intermittent droughts and flooding as is expected in central Europe with climate change. We found that MAOM destabilization was significantly greater under flooding compared to optimal and drought conditions. MAOM destabilization was particularly accentuated in MAOM initially bound to poorly crystalline ferrihydrite compared to MAOM initially bound to more crystalline goethite. Our results suggest that MAOM bound to poorly crystalline minerals (ferrihydrite) may be particularly vulnerable to destabilization in the rhizosphere during intense precipitation events, contributing to soil carbon loss. With the increasingly extreme nature of precipitation events, understanding the underlying MAOM destabilization mechanisms in the rhizosphere is essential for better predictions of the soil carbon response to environmental change.
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Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé ; titre concordant.
- Titre Crossref
- Episodic drought and flooding impacts on the destabilization of mineral-associated organic matter in the rhizosphere
- Date Crossref
- 18/03/2025
- Éditeur
- Copernicus GmbH
- Type
- posted-content
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 Lausanne Institute of Earth Surface Dynamics (IDYST) pays non établi dans la noticeUniversité ou école supérieure
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École Polytechnique Fédérale de Lausanne pays non établi dans la noticeUniversité ou école supérieure
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University of Neuchâtel Institute of Chemistry pays non établi dans la noticeUniversité ou école supérieure
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Helmholtz Centre for Environmental Research pays non établi dans la noticeStructure de recherche
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University of Tübingen Department of Geosciences pays non établi dans la noticeUniversité ou école supérieure
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Environmental Engineering Institute (IIE) pays non établi dans la noticeStructure de recherche
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Plant Biogeochemistry pays non établi dans la noticeInstitution
Institute of Earth Surface Dynamics (IDYST) — University of Lausanne, École Polytechnique Fédérale de Lausanne et Institute of Chemistry — University of Neuchâtel, avec 4 autres affiliations.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.