Deborde Jonathan, Marchand Cyril, Molnar Nathalie, Della Patrona L., Meziane T. (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, 52-72. ISSN 2077-1312.
Titre du document
Concentrations and fractionation of carbon, iron, sulfur, nitrogen and phosphorus in mangrove sediments along an intertidal gradient (semi-arid climate, New Caledonia)
Année de publication
2015
Auteurs
Deborde Jonathan, Marchand Cyril, Molnar Nathalie, Della Patrona L., Meziane T.
Source
Journal of Marine Science and Engineering, 2015,
3, 52-72 ISSN 2077-1312
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 element
Plan de classement
Milieux physico-chimique [032MILPHY]
Descripteurs
MANGROVE ; ZONATION ECOLOGIQUE ; CYCLE BIOGEOCHIMIQUE ; CARBONE ; SOUFRE ; AZOTE ; PHOSPHORE
Description Géographique
NOUVELLE CALEDONIE
Localisation
Fonds IRD [F B010080090]
Identifiant IRD
fdi:010080090
