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首页> 外文期刊>Estuarine Coastal and Shelf Science >Ecogeochemical fate of coarse organic particles in sediments of the Rhone River prodelta
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Ecogeochemical fate of coarse organic particles in sediments of the Rhone River prodelta

机译：罗纳河三角洲沉积物中粗有机颗粒的生态地球化学命运

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摘要

Coarse particulate organic matter (CPOM) represents a small portion of the inner shelf sediments but occurs across all river outlets. To consider the ecogeochemical fate of CPOM in such an environment, we examined both the infauna community and secondary evidence of geochemical reactions preserved in the surface sediments of the Rh6ne prodelta. ICP-AES, scanning electron microscopy and energy dispersive X-ray spectrometry of the CPOM showed that the fate of organic matter in this environment is driven by sulphate reduction and geochemical reactions resulting from the precipitation of sulfide due to the presence of large amounts of iron-bearing minerals. Leaf litter debris contained such high quantities of iron that after dry ashing the remaining material is easily attracted by a magnet. The observed geochemical trade-off was proposed as a mechanism that helps to maintain a bioturbating animal community that in turn contributes to the mineralization of organic matter within this suboxic environment. This study showed that the accumulation of refractory organic carbon in sediments was intimately associated with the sequestering of iron and sulphur by providing a nucleation point for mineral deposition and also that the extent of decomposition of the organic materials did not necessarily increase progressively from coarser to finer particles.
机译：粗颗粒有机物（CPOM）占内陆沉积物的一小部分，但遍布所有河流出口。为了考虑CPOM在这种环境中的生态地球化学命运，我们检查了动物群落和Rh6ne三角洲表面沉积物中保留的地球化学反应的次要证据。 ICP-AES，CPOM的扫描电子显微镜和能量色散X射线光谱分析表明，这种环境下有机物的命运是由于存在大量铁而导致的硫化物沉淀导致的硫酸盐还原和地球化学反应驱动的矿物质。枯枝落叶残渣中含有大量的铁，在干灰化后，残留的材料很容易被磁铁吸引。提出了观察到的地球化学折衷，作为有助于维持生物扰动动物群落的机制，而生物扰动动物群落反过来又促进了该低氧环境中有机物的矿化。这项研究表明，沉积物中难熔有机碳的积累与铁和硫的螯合密切相关，因为它提供了矿物沉积的成核点，而且有机物质的分解程度并不一定从粗到细逐渐增加。粒子。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2014年第20期|97-103|共7页
  • 作者

    Francois Charles; Jennifer Coston-Guarini; Francois Lantoine; Jean-Marc Guarini; Mustafa Yuecel;

  • 作者单位

    CNRS, UMR 8222, Laboratoire d'Ecogeochimie des Environnements Benthiques, F-66650 Banyuls/mer, France,Sorbonne Universites, UPMC Univ Paris 06, UMR 8222, LECOB, Observatoire oceanologique, F-66650 Banyuls/mer, France,Sorbonne Universites, UPMC Univ Paris 06, UMR 8222,LECOB, Observatoire oceanologique, F-66650 Banyuls/mer, France;

    UPMC, Univ Paris 06, 4 Place Jussieu, 75252 Paris France;

    CNRS, UMR 8222, Laboratoire d'Ecogeochimie des Environnements Benthiques, F-66650 Banyuls/mer, France,Sorbonne Universites, UPMC Univ Paris 06, UMR 8222, LECOB, Observatoire oceanologique, F-66650 Banyuls/mer, France;

    CNRS, UMR 8222, Laboratoire d'Ecogeochimie des Environnements Benthiques, F-66650 Banyuls/mer, France,Sorbonne Universites, UPMC Univ Paris 06, UMR 8222, LECOB, Observatoire oceanologique, F-66650 Banyuls/mer, France;

    CNRS, UMR 8222, Laboratoire d'Ecogeochimie des Environnements Benthiques, F-66650 Banyuls/mer, France,Sorbonne Universites, UPMC Univ Paris 06, UMR 8222, LECOB, Observatoire oceanologique, F-66650 Banyuls/mer, France,GEOMAR - Helmholtz Centre for Ocean Research Kiel,Wischhofstr. 1-3, 24148 Kiel, Germany;

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  • 正文语种 eng
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  • 关键词

    CPOM; iron; estuary; biogeochemistry; ecogeochemistry; Mediterranean Sea;

    机译：CPOM;铁;河口;生物地球化学生态地球化学地中海;

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