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首页> 外文期刊>Estuarine Coastal and Shelf Science >A multi-proxy study of sedimentary humic substances in the salt marsh of the Changjiang Estuary, China
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A multi-proxy study of sedimentary humic substances in the salt marsh of the Changjiang Estuary, China

机译：长江口盐沼沉积物中腐殖质的多代理研究

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摘要

To better understand the origin, composition, and reactivity of sedimentary humic substances (HSs) in salt marshes in the Changjiang Estuary, HS samples were isolated from a sediment core that was collected from the Eastern Chongming salt marsh. Chemical and spectroscopic methods were used to analyze the features of these HSs. The results indicate that the studied HSs in the salt marsh sediments are mainly terrestrial-derived and that the sedimentary organic matter (SUM) in the top layer may contain more organic matter from marine sources and/or autochthonous materials due to the dramatic decreasing of the sediment supply as a result of damming. The degradation of labile carbohydrates and proteins and the preservation of refractory lignin components dominate the early diagenetic reactions of SUM in the salt marsh area. The average contents of the carboxylic groups in FAs and HAs are 11.64 +/- 1.08 and 7.13 +/- 0.16 meq/gC, and those of phenolic groups are 1.95 +/- 0.13 and 2.40 +/- 0.44 meq/gC, respectively. The content of carboxylic groups increased with increasing depth, while there were no obvious changes in the content of phenolic groups. The average concentration of total proton-binding sites is approximately 12.5 mu mol/g sediment for the studied HSs. These values may provide insight into the migration and fate of HS-bound contaminants in sediments and the overlying sea water in the salt marsh areas of the Changjiang Estuary. (C) 2014 Elsevier Ltd. All rights reserved.
机译：为了更好地了解长江口盐沼中的腐殖质沉积物（HSs）的来源，组成和反应性，从东部崇明盐沼收集的沉积物核心中分离了HS样品。化学和光谱方法被用来分析这些HS的特征。结果表明，盐沼沉积物中研究的HSs主要是陆地来源的，并且由于盐分的急剧减少，顶层的沉积有机物（SUM）可能包含更多来自海洋资源和/或本地物质的有机物。由于筑坝而造成的泥沙供应。不稳定的碳水化合物和蛋白质的降解以及难降解的木质素成分的保存主导着盐沼地区SUM的早期成岩反应。 FA和HA中羧基的平均含量分别为11.64 +/- 1.08和7.13 +/- 0.16 meq / gC，酚基的平均含量分别为1.95 +/- 0.13和2.40 +/- 0.44 meq / gC。羧基的含量随深度增加而增加，而酚基的含量没有明显变化。对于所研究的HS，总质子结合位点的平均浓度约为12.5μmol / g沉积物。这些值可以为长江口盐沼地区沉积物中与HS结合的污染物的迁移和命运以及上覆海水的命运提供深刻见解。 （C）2014 Elsevier Ltd.保留所有权利。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2014年第5期|295-301|共7页
  • 作者

    Zhang Yaoling; Du Jinzhou; Zhao Xin; Wu Wangsuo; Peng Bo; Zhang Jing;

  • 作者单位

    E China Normal Univ, State Key Lab Estuarine & Coastal Res, Shanghai 200062, Peoples R China|Chinese Acad Sci, Qinghai Inst Salt Lakes, Xining 810008, Peoples R China;

    E China Normal Univ, State Key Lab Estuarine & Coastal Res, Shanghai 200062, Peoples R China;

    E China Normal Univ, Dept Phys, Shanghai 200062, Peoples R China;

    Lanzhou Univ, Sch Nucl Sci & Technol, Lanzhou 730000, Peoples R China;

    E China Normal Univ, Dept Phys, Shanghai 200062, Peoples R China;

    E China Normal Univ, State Key Lab Estuarine & Coastal Res, Shanghai 200062, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    fulvic acids; humic acids; sediments; salt marshes; Changjiang Estuary;

    机译：黄腐酸;腐殖酸;沉积物;盐沼;长江口;

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