Phosphate buffering in mangrove sediment pore water under eutrophication and deforestation influences
Résumé
Phosphorus (P) behavior was evaluated in mangrove wetlands impacted by urban sewage, including a deforested site. Sediment cores were analyzed for grain size, organic carbon, total nitrogen, stable isotopes (δ 13 C and δ 15 N), P contents, and pore water PO 4 3-concentrations and net consumption/production rates. Under stronger eutrophication influence, significantly higher P (1390 vs. <1000 μg/g), δ 15 N (8.9 vs. <6.7 ‰) and algal material contents (with lower C/N ratio and heavier δ 13 C) occurred. Depth-integrated PO 4 3-consumption rates in eutrophicated sites were up to two orders of magnitude higher (at the deforested site) than in a moderately preserved mangrove. The whole core of the moderately preserved site presented no saturation of PO 4 3-buffering capacity, while more eutrophicated sites developed buffering zones saturated at ~18-26 cm depth. Contrasting to nearby subtidal environments, eutrophication did not cause larger pore water PO 4 3-concentration, evidencing the role of PO 4 3-buffering on P filtering by mangrove wetlands.
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nascimento et al 2024-1.pdf (4.84 Mo)
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1-s2.0-S0025326X24001073-main.pdf (4.84 Mo)
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Origine | Fichiers produits par l'(les) auteur(s) |
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