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首页> 外文期刊>Environmental Science & Technology >Transport Zonation Limits Coupled Nitrification-Denitrification in Permeable Sediments
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Transport Zonation Limits Coupled Nitrification-Denitrification in Permeable Sediments

机译：渗透性沉积物中耦合硝化-反硝化作用的运输分区极限

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摘要

Measurement of biogeochemical processes in permeable sediments (including the hyporheic zone) is difficult because of complex multidimensional advective transport.This is especially the case for nitrogen cycling,which involves several coupled redox-sensitive reactions.To provide detailed insight into the coupling between ammonification,nitrification and denitrification in stationary sand ripples,we combined the diffusion equilibrium thin layer (DET) gel technique with a computational reactive transport biogeochemical model.The former approach provided high-resolution two-dimensional distributions of NO_3~- and ~(15)N-N_2 gas.The measured two-dimensional profiles correlate with computational model simulations,showing a deep pool of N_2 gas forming,and being advected to the surface below ripple peaks.Further isotope pairing calculations on these data indicate that coupled nitrification-denitrification is severely limited in permeable sediments because the flow and transport field limits interaction between oxic and anoxic pore water.The approach allowed for new detailed insight into subsurface denitrification zones in complex permeable sediments.
机译：由于复杂的多维对流输运，很难测量可渗透沉积物（包括低渗带）中的生物地球化学过程。对于氮循环而言，尤其如此，这涉及多个耦合的氧化还原敏感反应。为深入了解氨化之间的耦合，在固定沙波纹中进行硝化和反硝化，我们将扩散平衡薄层（DET）凝胶技术与计算的反应输运生物地球化学模型相结合。前一种方法提供了NO_3〜-和〜（15）N-的高分辨率二维分布N_2气。测得的二维剖面与计算模型仿真相关，显示出N_2气形成的深池，并平流到波纹峰以下的表面。对这些数据的进一步同位素配对计算表明，耦合硝化-反硝化作用受到严重限制在渗透性沉积物中，因为流场和传输场受到限制有氧和无氧孔隙水之间的相互作用。该方法可以对复杂的可渗透沉积物中的地下反硝化区提供新的详细见解。

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  • 来源
    《Environmental Science & Technology》 |2013年第23期|13404-13411|共8页
  • 作者

    Adam J.Kessler; Ronnie N.Glud; M.Bayani Cardenas; Perran L.M.Cook;

  • 作者单位

    Water Studies Centre,Monash University,Clayton,Victoria 3800,Australia;

    University of Southern Denmark and NordCEE,5230 Odense M,Denmark,Greenland Climate Research Centre,Greenland Institute of Natural Resources,3900 Nuuk,Greenland,Arctic Research Centre,Aarhus University,8000 Aarhus C,Denmark,Scottish Marine Institute,Scottish Association of Marine Science,Oban,Argyll PA37 1QA,Scotland;

    Geological Sciences,University of Texas at Austin,Austin,Texas 78712,United States;

    Water Studies Centre,Monash University,Clayton,Victoria 3800,Australia;

  • 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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  • 正文语种 eng
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