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J. Mar. Sci. Eng. 2015, 3(1), 52-72;

Concentrations and Fractionation of Carbon, Iron, Sulfur, Nitrogen and Phosphorus in Mangrove Sediments Along an Intertidal Gradient (Semi-Arid Climate, New Caledonia)

Institut de Recherche pour le Développement (IRD), UR 206, UMR 7590—IMPMC, F-98848 New Caledonia, France
UMR BOREA 7208 CNRS-MNHN-UPMC-IRD-UCBN, Muséum National Histoire Naturelle, CP 53, 61 rue Buffon, 75231 Paris cedex 05, France
Lagons, Ecosystèmes et Aquaculture Durable (LEAD/NC), Ifremer, 101, Promenade Roger Laroque, Center IRD, BP 2059–98846 Nouméa Cedex, New Caledonia
Author to whom correspondence should be addressed.
Academic Editors: Joseph M. Smoak and Christian Joshua Sanders
Received: 2 November 2014 / Accepted: 4 February 2015 / Published: 10 February 2015
(This article belongs to the Special Issue Biogeochemical Cycles in Mangrove Forests)
Full-Text   |   PDF [1748 KB, uploaded 10 February 2015]   |  


In mangrove ecosystems, strong reciprocal interactions exist between plant and substrate. Under semi-arid climate, Rhizophora spp. are usually predominant, colonizing the seashore, and Avicennia marina develops at the edge of salt-flats, which is the highest zone in the intertidal range. Along this zonation, distribution and speciation of C, Fe, S, N, and P in sediments and pore-waters were investigated. From the land-side to the sea-side of the mangrove, sediments were characterized by I/ increase in: (i) water content; (ii) TOC; (iii) mangrove-derived OM; II/ and decrease in: (i) salinity; (ii) redox; (iii) pH; (iv) solid Fe and solid P. Beneath Avicennia and Rhizophora, TS accumulated at depth, probably as a result of reduction of iron oxides and sulfate. The loss of total Fe observed towards the sea-side may be related to sulfur oxidation and to more intense tidal flushing of dissolved components. Except the organic forms, dissolved N and P concentrations were very low beneath Avicennia and Rhizophora stands, probably as a result of their uptake by the root systems. However, in the unvegetated salt-flat, NH4+ can accumulate in organic rich and anoxic layers. This study shows: (i) the evolution of mangrove sediment biogeochemistry along the intertidal zone as a result of the different duration of tidal inundation and organic enrichment; and (ii) the strong links between the distribution and speciation of the different elements. View Full-Text
Keywords: mangrove; zonation; biogeochemistry; New Caledonia mangrove; zonation; biogeochemistry; New Caledonia

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Deborde, J.; Marchand, C.; Molnar, N.; Patrona, L.D.; Meziane, T. Concentrations and Fractionation of Carbon, Iron, Sulfur, Nitrogen and Phosphorus in Mangrove Sediments Along an Intertidal Gradient (Semi-Arid Climate, New Caledonia). J. Mar. Sci. Eng. 2015, 3, 52-72.

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