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首页> 外文期刊>Estuarine Coastal and Shelf Science >Origin of sedimentary organic matter in the north-western Adriatic Sea
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Origin of sedimentary organic matter in the north-western Adriatic Sea

机译：亚得里亚海西北部沉积有机质的起源

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摘要

In order to evaluate the origin and the transformation of organic matter on the shallow shelf of the NW Adriatic Sea, organic carbon, total nitrogen and stable isotope ratios of organic carbon were analysed in riverine suspended matter and sediments as well as in marine suspended and sedimentary organic matter, in marine phytoplankton and zooplankton.rnThe deposition of organic matter is influenced by fine sediment concentration. Surface sediments were characterised by highly variable biogeochemical conditions on the sea floor, whereas sub-surface sediments showed a more homogeneous hypoxic/anoxic environment.rnLow C_(org)/N ratio and high organic carbon and nitrogen concentrations in riverine suspended organic matter indicate an important contribution of freshwater phytoplankton within rivers, particularly during low flow regimes, which adds to the marine phyto- and zooplankton at shelf locations.rnIn order to evaluate the importance of terrestrial, riverine and marine sources of OM in shelf sediments, a three end-member mixing model was applied to shelf surface sediments using ~(13)C/~(12)C values for organic matter and N/C ratios. The model showed an elevated contribution of terrestrial organic substances at intermediate depths (10-15 m), mostly corresponding to an area of coarser grain-size, whereas the riverine and marine organic fractions were mainly accumulating near the coast and offshore, respectively.
机译：为了评估西北亚得里亚海浅海陆架上有机物的起源和转化，分析了河流悬浮物和沉积物以及海洋悬浮和沉积物中的有机碳，总氮和有机碳的稳定同位素比。海洋浮游植物和浮游动物中的有机质。有机质的沉积受精细沉积物浓度的影响。表层沉积物的特征是海床的生物地球化学条件高度可变，而表层沉积物显示出更均匀的低氧/缺氧环境。rn C_（org）/ N比低，河流悬浮有机质中的有机碳和氮浓度高表明为了评估河流中淡水浮游植物的重要贡献，特别是在低流量时期，这增加了架子位置的海洋浮游植物和浮游动物。为了评估陆地，河流和海洋有机物在架子沉积物中的重要性，三端成员混合模型使用〜（13）C /〜（12）C值的有机质和N / C比值应用于架子表面沉积物。该模型显示，在中等深度（10-15 m），陆地有机物的贡献增加，主要对应于较粗粒度的区域，而河流和海洋有机物分别主要聚集在沿海和近海。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2009年第4期|573-583|共11页
  • 作者

    M. Giani; D. Berto; F. Rampazzo; F. Savelli; F. Alvisi; P. Giordano; M. Ravaioli; F. Frascari;

  • 作者单位

    Istituto Superiore per la Protezione e la Ricerca Ambientale, Brondolo, 30015 Chioggia, Italy Dip. Oceanografia Biologica, Istituto Nazionale di Oceanografia e Geofisica Sperimentale, 34014 Trieste, Italy Dip. Oceanografia Bioiogica, lstituto Nazionale di Oceanografia e di Geofisica Sperimentale, via A. Piccard, 54 34151 Trieste. Italy;

    Istituto Superiore per la Protezione e la Ricerca Ambientale, Brondolo, 30015 Chioggia, Italy;

    Istituto Superiore per la Protezione e la Ricerca Ambientale, Brondolo, 30015 Chioggia, Italy;

    Istituto Superiore per la Protezione e la Ricerca Ambientale, Brondolo, 30015 Chioggia, Italy;

    Istituto di Scienze Marine-Consiglio Nazionale delle Ricerche, 40129 Bologna, Italy;

    Istituto di Scienze Marine-Consiglio Nazionale delle Ricerche, 40129 Bologna, Italy;

    Istituto di Scienze Marine-Consiglio Nazionale delle Ricerche, 40129 Bologna, Italy;

    Istituto di Scienze Marine-Consiglio Nazionale delle Ricerche, 40129 Bologna, Italy;

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  • 正文语种 eng
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  • 关键词

    shelf-sediments; organic carbon; carbon stable isotopes; adriatic sea; po river;

    机译：货架沉淀物;有机碳碳稳定同位素亚得里亚海;波河;

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