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首页> 外文期刊>Environmental Science & Technology >Hyporheic Exchange and Fulvic Acid Redox Reactions in an Alpine Stream/Wetland Ecosystem,Colorado Front Range
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Hyporheic Exchange and Fulvic Acid Redox Reactions in an Alpine Stream/Wetland Ecosystem,Colorado Front Range

机译：科罗拉多河前流/湿地生态系统中的羟交换和黄腐酸氧化还原反应

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摘要

The influence of hyporheic zone interactions on the redox state of fulvic acids and other redox active species was investigated in an alpine stream and adjacent wetland,which is a more reducing environment.A tracer injection experiment using bromide (Br~-)was conducted in the stream system.Simulations with a transport model showed that rates of exchange between the stream and hyporheic zone were rapid (alpha approx=10~(-3)s~(-1)).Parallel factor analysis of fluorescence spectra was used to quantify the redox state of dissolved fulvic acids.The rate coefficient for oxidation of reduced fulvic acids (;ambda =6.5 x 10~(-3)s~(-1))in the stream indicates that electron-transfer reactions occur over short time scales.The rate coefficients for decay of ammonium U =1.2 x 10~(-3)s~(-1))and production of nitrate (A =-1.0 x 10~(-3)s~(-1))were opposite in sign but almost equal in magnitude.Our results suggest that fulvic acids are involved in rapid electron-transfer processes in and near the stream channel and may be important in determining ecological energy flow at the catchment scale.
机译：在高山流和邻近的湿地中研究了流变区相互作用对黄腐酸和其他氧化还原活性物质的氧化还原状态的影响，这是一个更具还原性的环境。在溴化氢（Br〜-）示踪剂注入实验中用输运模型进行的模拟表明，河流与泄水带之间的交换速率很快（α大约= 10〜（-3）s〜（-1））。溶解的富里酸的氧化还原状态。流中还原性富里酸的氧化速率系数（; ambda = 6.5 x 10〜（-3）s〜（-1））表明电子转移反应在短时间内发生。氨的衰减速率系数U = 1.2 x 10〜（-3）s〜（-1））与硝酸盐的产生速率系数（A = -1.0 x 10〜（-3）s〜（-1））在符号，但大小几乎相等。我们的结果表明，富里酸在水流中及其附近参与了快速的电子转移过程渠道，对于确定流域规模的生态能流可能很重要。

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  • 来源
    《Environmental Science & Technology》 |2006年第19期|p.5943-5949|共7页
  • 作者

    MATTHEW P.MILLER; DIANE M.MCKNIGHT; ROSE M.CORY;

  • 作者单位

    Department of Civil,Environmental,and Architectural Engineering,Institute of Arctic and Alpine Research,University of Colorado,Boulder,Colorado 80309-0450,and Department of Geography,Institute of Arctic and Alpine Research,University of Colorado,Boul;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境化学;
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