Concentrations and fractionation of carbon, iron, sulfur, nitrogen and phosphorus in mangrove sediments along an intertidal gradient (semi-arid climate, New Caledonia)

Type Article
Date 2015-03
Language English
Author(s) Deborde Jonathan1, Marchand Cyril1, Molnar Nathalie1, 2, Della Patrona Luc3, Meziane Tarik2
Affiliation(s) 1 : UMR 7590 IMPMC, UR 206, IRD, F-98848 New Caledonia, France.
2 : UMR BOREA 7208 CNRS MNHN UPMC IRD UCBN, Museum Natl Hist Nat, F-75231 Paris 05, France.
3 : Ctr IRD, Ifremer, Dept Lagons Ecosyst & Aquaculture Durable LEAD NC, Noumea, New Caledonia.
Source Journal Of Marine Science And Engineering (2077-1312) (Mdpi), 2015-03 , Vol. 3 , N. 1 , P. 52-72
DOI 10.3390/jmse3010052
WOS© Times Cited 21
Keyword(s) mangrove, zonation, biogeochemistry, New Caledonia
Abstract 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.
Full Text
File Pages Size Access
Publisher's official version 21 1 MB Open access
Top of the page

How to cite 

Deborde Jonathan, Marchand Cyril, Molnar Nathalie, Della Patrona Luc, Meziane Tarik (2015). Concentrations and fractionation of carbon, iron, sulfur, nitrogen and phosphorus in mangrove sediments along an intertidal gradient (semi-arid climate, New Caledonia). Journal Of Marine Science And Engineering, 3(1), 52-72. Publisher's official version : https://doi.org/10.3390/jmse3010052 , Open Access version : https://archimer.ifremer.fr/doc/00251/36252/