%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES
%A Deborde, Jonathan
%A Marchand, Cyril
%A Molnar, Nathalie
%A Della Patrona, L.
%A Meziane, T.
%T Concentrations and fractionation of carbon, iron, sulfur, nitrogen and phosphorus in mangrove sediments along an intertidal gradient (semi-arid climate, New Caledonia)
%D 2015
%L fdi:010080090
%G ENG
%J Journal of Marine Science and Engineering
%@ 2077-1312
%K MANGROVE ; ZONATION ECOLOGIQUE ; CYCLE BIOGEOCHIMIQUE ; CARBONE ; SOUFRE ; AZOTE ; PHOSPHORE
%K NOUVELLE CALEDONIE
%M ISI:000435663200003
%P 52-72
%R 10.3390/jmse3010052
%U https://www.documentation.ird.fr/hor/fdi:010080090
%> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers21-01/010080090.pdf
%V 3
%W Horizon (IRD)
%X 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
%$ 032MILPHY