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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	(210)Pb-derived Sedimentation Rates and C(org) Fluxes in Soledad Lagoon (Cispata Lagoon System, NW Caribbean Coast of Colombia)
Auteurs :	Ana Carolina Ruiz-Fernandez, Auteur ; Jose Luis Marrugo-Negrete, Auteur ; Roberth Paternina-Uribe, Auteur ; Libia Hascibe Perez-Bernal, Auteur
Type de document :	Article
Dans :	Estuaries and Coasts (34(6) NOV 2011)
Article en page(s) :	1117-1128
Résumé :	With the aim of evaluating temporal changes in sedimentation and organic carbon (C(org)) supplied over the last similar to 100 years, a sediment core was collected at Soledad Lagoon, a costal ecosystem surrounded by mangroves, located in the Cispata Estuary (Caribbean coast of Colombia). The core sediments were characterized by low concentrations of calcium carbonate (0.2-2.9%), organic matter (3-8%), total nitrogen (0.11-0.38%), and total phosphorus (0.19-0.65 mg g(-1)). Fe and Al concentrations ranged from 4% to 5%, and Mn from 356 to 1,047 mu g g(-1). The (210)Pb-derived sediment and mass accumulation rates were 1.54 +/- 0.18 mm year(-1) and 0.08 +/- 0.01 gcm(-2) year(-1), respectively. The sediment core did not provide evidence of human impact, such as enhancement of primary production or nutrient enrichment, which may result from recent land uses changes or climate change. The C(org) fluxes estimated for Soledad Lagoon core lay in the higher side of carbon fluxes to coastal ecosystems (314-409 gm(-2) year(-1)) and the relatively high C(org) preservation observed (similar to 45%) indicate that these lagoon sediments has been a net and efficient sink of C(org) during the last century, which corroborate the importance of mangrove areas as important sites for carbon burial and therefore, long-term sequestration of C(org).

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