Functional organic matter components in mangrove soils revealed by density fractionation
Rattachement africain : jp, au. Niveau de preuve : code pays fourni par la source.
Le résumé fourni par la source
The mechanisms underlying stabilization of soil organic matter (SOM) in coastal ecosystems, including mangrove forests, are poorly understood, limiting our ability to predict the consequences of disturbances. Here, we introduce density fractionation to mangrove soils to identify the distribution and properties of the functional components of SOM with regard to degradation state, stability, and origin, namely, the high-density fraction (HF), free low-density fraction (f-LF), and mineral-associated LF (m-LF). Three soil cores (1 m) were collected in a mangrove forest on Ishigaki Island, Japan and cut into 10 cm intervals and analyzed. The massive production of mangrove fine roots resulted in a high abundance of LFs throughout the cores, which markedly differed from terrestrial soils. Relative abundance of LFs together accounted for 38%–66% of total soil C. The m-LF was as abundant as f-LF and 1.6 times higher in relative abundance than the global average of terrestrial soils. The C/N ratios and δ13C values clearly increased with depth in all fractions, which was attributed to the increased contribution from roots. We found a consistent pattern in Δ14C values of density fractions. HF was the oldest with Δ14C between -149‰ and -97‰ followed by m-LF (between -130‰ and -87‰) and then f-LF (between -89‰ and 78‰), suggesting that mineral association may be pivotal in long-term carbon storage in the mangrove mineral soil. Our analysis successfully identified meaningful functional components of mangrove SOM, yet several questions remained unanswered, including a large variability in Δ14C in different cores. Future studies would benefit from a coupled analysis of quantity and quality of density fractions and geochemical factors in the mangrove soil.
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Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé ; titre concordant.
- Titre Crossref
- Functional organic matter components in mangrove soils revealed by density fractionation
- Date Crossref
- 06/07/2023
- Éditeur
- California Digital Library (CDL)
- 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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Graduate School of Science Department of Earth and Planetary Science 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 5 autres affiliations.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.