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首页> 外文期刊>Environmental Science & Technology >Discharge Driven Nitrogen Dynamics in a Mesoscale River Basin As Constrained by Stable Isotope Patterns
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Discharge Driven Nitrogen Dynamics in a Mesoscale River Basin As Constrained by Stable Isotope Patterns

机译：受稳定同位素模式约束的中尺度流域的水流驱动氮动力学

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摘要

Nitrate loads and corresponding dual-isotope signatures were used to evaluate large scale N dynamics and trends in a river catchment with a strong anthropogenic gradient (forest conservation areas in mountain regions, and intensive agriculturally used lowlands). The Bode River catchment with an area of 3200 km~2 in the Harz Mountains and central German lowlands was investigated by a two years monitoring program including 133 water sampling points each representing a subcatchment. Based on discharge data either observed or simulated by the mesoscale hydrological model (mHM) a load based interpretation of hydrochemical and isotope data was conducted. Nitrate isotopic signatures in the entire catchment are influenced by (Ⅰ) the contribution of different nitrogen sources, (Ⅱ) by variable environmental conditions during the formation of nitrate, and (Ⅲ) by a minor impact of denitrification. For major tributaries, a relationship between discharge and nitrate isotopic signatures is observed. This may in part be due to the fact, that during periods of higher hydrologic activity a higher wash out of isotopically lighter nitrate formed by bacterial nitrification processes of reduced or organic soil nitrogen occurs. Beyond that, in-stream denitrification seems to be more intense during periods of low flow.
机译：硝酸盐负荷和相应的双同位素特征被用于评估人为梯度强的河流集水区（山区的森林保护区和农业密集的低地）的大规模氮动力学和趋势。通过一项为期两年的监测计划，对位于哈茨山脉和德国中部低地的博德河流域进行了调查，该流域面积为3200 km〜2，包括133个水采样点，每个采样点代表一个小流域。基于中尺度水文模型（mHM）观测或模拟的排放数据，对水化学和同位素数据进行了基于负荷的解释。整个集水区的硝酸盐同位素特征受以下因素影响：（Ⅰ）不同氮源的贡献；（Ⅱ）硝酸盐形成过程中环境条件的变化；（Ⅲ）反硝化的较小影响。对于主要支流，观察到排放量与硝酸盐同位素特征之间的关系。这可能部分是由于以下事实：在较高的水文活动期间，发生了由还原的或有机土壤氮的细菌硝化过程形成的同位素较轻的硝酸盐的较高洗脱。除此之外，在流量低的时期，流内反硝化作用似乎更加强烈。

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  • 来源
    《Environmental Science & Technology》 |2016年第17期|9187-9196|共10页
  • 作者

    Christin Mueller; Matthias Zink; Luis Samaniego; Ronald Krieg; Ralf Merz; Michael Rode; Kay Knoeller;

  • 作者单位

    Helmholtz Center for Environmental Research UFZ - Department Catchment Hydrology - Stable Isotope Group, Theodor-Lieser-Strasse 4, D-06120 Halle (Saale), Germany;

    Helmholtz Center for Environmental Research UFZ - Department Computational Hydrosystems - Permoserstrasse 15, 04318 Leipzig, Germany;

    Helmholtz Center for Environmental Research UFZ - Department Computational Hydrosystems - Permoserstrasse 15, 04318 Leipzig, Germany;

    Helmholtz Center for Environmental Research UFZ - Department Catchment Hydrology - Stable Isotope Group, Theodor-Lieser-Strasse 4, D-06120 Halle (Saale), Germany;

    Helmholtz Center for Environmental Research UFZ - Department Catchment Hydrology - Stable Isotope Group, Theodor-Lieser-Strasse 4, D-06120 Halle (Saale), Germany;

    Helmholtz Center for Environmental Research UFZ - Department Aquatic Ecosystem Analysis - Brueckstrasse 3a, 39114 Magdeburg, Germany;

    Helmholtz Center for Environmental Research UFZ - Department Catchment Hydrology - Stable Isotope Group, Theodor-Lieser-Strasse 4, D-06120 Halle (Saale), Germany;

  • 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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