Organo-metal coprecipitation contributes to stable organic carbon fraction in mangrove soil
Rattachement africain : jp, au. Niveau de preuve : code pays fourni par la source.
Le résumé fourni par la source
Abstract Prediction of the impact of anthropogenic disturbances and global change on organic carbon (OC) pools in mangrove soils requires a detailed understanding of the mechanisms underlying OC stabilization. Using density fractionation to physically separate OC fractions with varying degrees of mineral association and protection, this study aimed to assess distributions of these fractions and the geochemical factors influencing the most dominant and refractory mineral-associated, high-density fraction (HF) in mangrove soil. We conducted forest-wide soil sampling in the Gaburumata mangrove forest on Ishigaki Island, Japan, along three transects (upstream, midstream, downstream) and at five depths (until 100 cm). The OC in HF (OC HF ) was the oldest (median Δ 14 C value of -13.81‰) and contributed most significantly to total soil OC (43%-63%) and nitrogen (64%-85%). Among the extractable metals analyzed (aluminum [Al], iron [Fe], calcium [Ca], and magnesium [Mg]) with different crystallinity, only organically complexed Al and Fe showed strong positive correlations with OC HF . Together with high OC HF :Fe ratios that surpassed the maximum sorptive capacity of Fe oxides, these results indicate that co-precipitation of OC and Fe was the dominant mode of organo-mineral associations. The low clay content reduced the importance of Ca and Mg on OC HF , as these divalent cations typically facilitate OC stabilization through cation bridging between negatively charged clay surfaces and organic matter. Furthermore, the Δ 14 C–OC relationship suggested efficient incorporation of mangrove-derived modern C into HF, in addition to the pre-existing old C. Thus, mangrove expansion is likely to enhance stable soil OC pools in addition to increasing plant biomass and litter. Overall, this study proposes a biogeochemical mechanism for how stable mangrove OC is newly formed, as well as maintained, with ramifications for global mangrove expansion and plantation efforts.
Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.
Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé ; titre concordant.
- Titre Crossref
- Organo-metal coprecipitation contributes to stable organic carbon fraction in mangrove soil
- Date Crossref
- 19/02/2025
- Éditeur
- openRxiv
- 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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Kobe University pays non établi dans la noticeUniversité ou école supérieure
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Gifu University River Basin Research Center pays non établi dans la noticeUniversité ou école supérieure
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The University of Tokyo Atmosphere and Ocean Research Institute pays non établi dans la noticeUniversité ou école supérieure
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Australian National University pays non établi dans la noticeUniversité ou école supérieure
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Japan Agency for Marine-Earth Science and Technology Department of Biogeochemistry pays non établi dans la noticeStructure de recherche
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Graduate School of Agricultural Science Soil Science Laboratory pays non établi dans la noticeUniversité ou école supérieure
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Research School of Physics pays non établi dans la noticeUniversité ou école supérieure
Kobe University, River Basin Research Center — Gifu University et Atmosphere and Ocean Research Institute — The University of Tokyo, avec 4 autres affiliations.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.