effect of benthic sediments on dissolved nutrient concentrations and fluxes

The Ria Formosa is a meso-tidal coastal lagoon experiencing enhanced nutrient concentrations. Assessment of sediment-seawater interaction is essential if nutrient dynamics and the risk of eutrophication are to be fully understood. Pore water concentrations of dissolved inorganic and organic phosphor...

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Veröffentlicht in:	Biogeochemistry 2006-11, Vol.81 (2), p.159-178
Hauptverfasser:	Murray, L. G, Mudge, S. M, Newton, A, Icely, J. D
Format:	Artikel
Sprache:	eng
Schlagworte:	Algae Ammonium Aquatic ecosystems Basins Biogeochemistry Earth sciences Earth, ocean, space Enteromorpha Eutrophication Exact sciences and technology Geochemistry Lagoons Marine and continental quaternary Mineralogy Mud Nutrient concentrations Nutrient dynamics Nutrients Phosphorus Pore water Salinity Salt marshes Sand Sea water Seawater Sediments Silicates Surficial geology Tide pools Water geochemistry
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Zusammenfassung:	The Ria Formosa is a meso-tidal coastal lagoon experiencing enhanced nutrient concentrations. Assessment of sediment-seawater interaction is essential if nutrient dynamics and the risk of eutrophication are to be fully understood. Pore water concentrations of dissolved inorganic and organic phosphorus, ammonium, nitrate and nitrite were determined in cores from six sites. Changes in nutrients concentrations were measured in intertidal pools on sand and mud between tides. Dissolved inorganic phosphorus (DIP) concentrations (~200 μmol l-¹) and effluxes (123 ± 14 μmol m-² h-¹) were greater from sand than mud (37 ± 10 μmol m-² h-¹), possibly due to the binding of P with the
ISSN:	0168-2563 1573-515X
DOI:	10.1007/s10533-006-9034-6