Concentrations and Fractionation of Carbon, Iron, Sulfur, Nitrogen and Phosphorus in Mangrove Sediments Along an Intertidal Gradient (Semi-Arid Climate, New Caledonia)
Concentrations and Fractionation of Carbon, Iron, Sulfur, Nitrogen and Phosphorus in Mangrove Sediments Along an Intertidal Gradient (Semi-Arid Climate, New Caledonia)
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DOI：
10.3390/jmse3010052
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发表时间：
2015-03-01
影响因子：
2.9
通讯作者：
Meziane, Tarik
中科院分区：
文献类型：
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作者：
Deborde, Jonathan;Marchand, Cyril;Meziane, Tarik
在红树林生态系统中，植物与基质之间存在着强烈的相互作用。在半干旱气候条件下，Rhizophora spp.通常占主导地位，定居在海滨，白骨壤海岸发展在盐滩的边缘，这是最高的地带，在潮间带。沿着这一分带，C，Fe，S，N和P在沉积物和孔隙水中的分布和形态进行了研究。从陆地一侧到海边的红树林，沉积物的特点是I/增加：（i）水含量;（ii）TOC;（iii）红树林衍生的OM; II/和减少：（i）盐度;（ii）氧化还原;（iii）pH值;（iv）固体铁和固体P.下面的白骨壤和Rhizophora，TS积累在深度，可能是由于铁的氧化物和硫酸盐的还原。向海边观察到的总铁的损失可能与硫的氧化和更激烈的潮汐冲刷溶解成分。除了有机形态，可溶性N和P的浓度都很低，白骨壤和Rhizophora的立场下，可能是由于他们的吸收的根系。而在无植被的盐滩中，NH ~（4+）可在富有机层和缺氧层中积累。这项研究表明：（i）由于潮汐淹没和有机物富集的不同持续时间，红树林沉积物地球化学沿着潮间带的演变;（ii）不同元素的分布和形态之间的密切联系。
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.