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首页> 外文期刊>Marine Chemistry >Influence of organic matter source and diagenetic state on photochemical release of dissolved organic matter and nutrients from resuspendable estuarine sediments
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Influence of organic matter source and diagenetic state on photochemical release of dissolved organic matter and nutrients from resuspendable estuarine sediments

机译：有机物来源和成岩状态对可重悬河口沉积物中溶解性有机物和养分的光化学释放的影响

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摘要

Presently there is a paucity of knowledge regarding the influence of sedimentary organic matter (SOM) source and diagenetic state on photolytic fluxes of dissolved organic matter and nutrients from sediments likely to be resuspended during high energy events such as storms. Here we present data on the photochemical release of dissolved organic carbon (DOC), total dissolved nitrogen (TON), dissolved organic nitrogen (DON), Nhtf, and PO4~4~(3-) from the fine fraction of sediments obtained along an estuarine gradient, coupled with analyses of biogeochemical and molecular indicators of SOM source. Photochemical release of DOC and PO_4~(3-) was significantly higher than dark controls at all sites. DOC photorelease from fine (
机译：目前，关于沉积有机物（SOM）源和成岩状态对可能在暴风雨等高能量事件中重新悬浮的溶解有机物和养分的光解通量的影响的知识很少。在这里，我们介绍了从沿一条线获得的细小沉积物中光化学释放的溶解有机碳（DOC），总溶解氮（TON），溶解有机氮（DON），Nhtf和PO4〜4〜（3-）的数据。河口梯度，再加上对SOM来源的生物地球化学和分子指标的分析。在所有部位，DOC和PO_4〜（3-）的光化学释放显着高于黑暗对照。精细（<10到20微米）沉积物中的DOC光释放比以前在悬浮液中使用大量沉积物的研究高十倍。沉积物光解过程中释放的养分和溶解性有机物的大小，化学计量和形态似乎受SOM源和成岩作用的组合影响。 DOC和PO_4〜（3-）的释放在上游位置较高，在这些位置沉积物主要由相对未改变的陆生SOM主导。相比之下，下游位置的TDN，DON和NH〜4〜+释放量更高，这表明陆生和水生来源的有机物降解程度更高。在所有位点，无机养分释放的比例都很低（NH_4〜+：PO_4〜（3-）-1-7），这表明SOM光解作为无机P的来源可能比N相对重要。我们的结果还表明： SOM具有广泛的光不稳定性，以前的研究可能低估了沉积物细小部分中DOC的光解释放。

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  • 来源
    《Marine Chemistry》 |2011年第4期|p.114-119|共6页
  • 作者

    Melissa W. Southwell; Ralph N. Mead; Catherine M. Luquire; Amy Barbera; G. Brooks Avery; Robert J. Kieber; Stephen A. Skrabal;

  • 作者单位

    University of North Carolina Wilmington, Department of Chemistry and Biochemistry, 601 South College Rd., Wilmington, NC 28403, United States,AAAAAAAAAAAAAAAAAAAA74 King St., St. Augustine, FL 32084, United States;

    University of North Carolina Wilmington, Department of Chemistry and Biochemistry, 601 South College Rd., Wilmington, NC 28403, United States;

    University of North Carolina Wilmington, Department of Chemistry and Biochemistry, 601 South College Rd., Wilmington, NC 28403, United States;

    University of North Carolina Wilmington, Department of Chemistry and Biochemistry, 601 South College Rd., Wilmington, NC 28403, United States;

    University of North Carolina Wilmington, Department of Chemistry and Biochemistry, 601 South College Rd., Wilmington, NC 28403, United States;

    University of North Carolina Wilmington, Department of Chemistry and Biochemistry, 601 South College Rd., Wilmington, NC 28403, United States;

    University of North Carolina Wilmington, Department of Chemistry and Biochemistry, 601 South College Rd., Wilmington, NC 28403, United States;

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  • 正文语种 eng
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  • 关键词

    nutrient cycles; photolysis; resuspension; dissolved organic matter; estuarine; cape fear river;

    机译：营养循环;光解重新悬浮;溶解的有机物河口;开普恐惧河;

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