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首页> 外文期刊>Environmental Science & Technology >Predicting Sources of Dissolved Organic Nitrogen to an Estuary from an Agro-Urban Coastal Watershed
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Predicting Sources of Dissolved Organic Nitrogen to an Estuary from an Agro-Urban Coastal Watershed

机译：预测从农业城市沿海流域到河口的溶解有机氮源

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摘要

Dissolved organic nitrogen (DON) is the nitrogen (N)-containing component of dissolved organic matter (DOM) and in aquatic ecosystems is part of the biologically reactive nitrogen pool that can degrade water quality in N-sensitive waters. Unlike inorganic N (nitrate and ammonium) DON is comprised of many different molecules of variable reactivity. Few methods exist to track the sources of DON in watersheds. In this study, DOM excitation-emission matrix (EEM) fluorescence of eight discrete DON sources was measured and modeled with parallel factor analysis (PARAFAC) and the resulting model ("FluorMod") was fit to 516 EEMs measured in surface waters from the main stem of the Neuse River and its tributaries, located in eastern North Carolina. PARAFAC components were positively correlated to DON concentration. Principle components analysis (PCA) was used to confirm separation of the eight sources and model validation was achieved by measurement of source samples not included in the model development with an error of ＜10%. Application of FluorMod to surface waters of streams within the Neuse River Basin showed that while ＞70% of DON was attributed to natural sources, nonpoint sources, such as soil and poultry litter leachates and street runoff, accounted for the remaining 30%. This result was consistent with changes in land use from urbanized Raleigh metropolitan area to the largely agricultural Southeastern coastal plain. Overall, the predicted fraction of nonpoint DON sources was consistent with previous reports of increased organic N inputs in this river basin, which are suspected of impacting the water quality of its estuary.
机译：溶解有机氮（DON）是溶解有机物（DOM）的含氮成分，在水生生态系统中是生物活性氮库的一部分，可降低N敏感水域的水质。与无机氮（硝酸盐和铵盐）不同，DON由许多不同的可变反应性分子组成。很少有方法可以跟踪流域中DON的来源。在这项研究中，对八个离散的DON源的DOM激发-发射矩阵（EEM）荧光进行了测量，并用并行因子分析（PARAFAC）进行了建模，所得模型（“ FluorMod”）适合于从主表层水中测得的516个EEM。位于北卡罗来纳州东部的Neuse河及其支流的干流。 PARAFAC成分与DON浓度呈正相关。使用主成分分析（PCA）确认了八个来源的分离，并通过测量模型开发中未包括的来源样本实现了模型验证，误差＜10％。在Neuse河流域的地表水中应用FluorMod的结果表明，虽然DON中的＞ 70％来自自然资源，但非点源，例如土壤和家禽垃圾渗滤液和街道径流占了剩余的30％。这一结果与从城市化的罗利都会区到农业大部的东南沿海平原的土地利用变化是一致的。总体而言，非点状呕吐源的预测比例与该流域先前增加有机氮输入的报道一致，据怀疑这会影响其河口的水质。

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  • 来源
    《Environmental Science & Technology》 |2016年第16期|8473-8484|共12页
  • 作者

    Christopher L. Osburn; Lauren T. Handsel; Benjamin L. Peierls; Hans W. Paerl;

  • 作者单位

    Department of Marine, Earth, and Atmospheric Sciences, North Carolina State University, Raleigh, North Carolina 27695 United States;

    Department of Marine, Earth, and Atmospheric Sciences, North Carolina State University, Raleigh, North Carolina 27695 United States,Cardno, Inc., Raleigh, North Carolina 27612, United States;

    Institute of Marine Sciences, University of North Carolina at Chapel Hill, Morehead City, North Carolina 28557 United States;

    Institute of Marine Sciences, University of North Carolina at Chapel Hill, Morehead City, North Carolina 28557 United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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