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Implications of flow intermittency on sediment nitrogen availability and processing rates in a Mediterranean headwater stream

机译：流动间歇性对地中海源头河流中沉积物氮的利用率和处理速率的影响

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摘要

Most streams draining to the Mediterranean basin are temporary. As a result of their hydrological regime, temporary streams are affected by drying and rewetting periods. Drying can alter in-stream nitrogen (N) availability and reduce N processing rates and subsequent retention after re-wetting. We sought to determine if hydrologic drying modifies reach-scale sediment chemical properties and constrains the response of N processing to rewetting. We compared different abiotic characteristics of sediments and nitrification and denitrification rates between a perennial and intermittent reach in the same stream over a wet period, when surface water flowed in both reaches, and a dry period, when the intermittent reach dried up. We analyzed N processing rates by incubating sediments with stream water, thereby simulating a rewetting when sediments from the intermittent reach were dry. We found that drying increased the sediment nitrate (NO_3~-) content. Conversely, drying did not reduce the recovery of N processing rates to pre-dry levels after simulated flooding conditions. Our results suggest that dry reaches may act as a potential NO_3~- source by releasing downstream NO_3~- pulses after stream flow recovery. Given the European Water Framework Directive requirements to assess stream ecological status, these N pulses following rewetting should be considered when designing management plans in temporary streams. Our study highlights the rapid response of in-stream N processing to rewetting period following a drought. This high resilience to process N should be seen as a vital ecosystem service provided by temporary streams despite annual dry periods.
机译：大部分流入地中海盆地的溪流都是临时的。由于其水文状况，临时溪流受到干燥和重新润湿期的影响。干燥会改变流中氮（N）的利用率，并降低氮的处理速率以及重新润湿后的保留率。我们试图确定水文干燥是否改变了达到规模的沉积物化学性质，并限制了氮处理对再润湿的响应。我们比较了在湿润时期（两个河流都流过地表水）和干燥时期（间歇到达水都干了）时，同一河流中多年生和间歇河段的沉积物以及硝化和反硝化率的不同非生物特征。我们通过将沉积物与水流一起温育来分析N的处理速率，从而模拟间歇性沉积物干燥后的再润湿。我们发现干燥增加了沉积物中硝酸盐（NO_3〜-）的含量。相反，在模拟淹没条件下，干燥并未将氮处理速率的恢复降低到干燥前的水平。我们的研究结果表明，干流河段可能在流恢复后释放下游的NO_3〜-脉冲，从而成为潜在的NO_3〜-来源。根据欧洲水框架指令评估溪流生态状况的要求，在设计临时溪流管理计划时应考虑再润湿后的这些N脉冲。我们的研究强调干旱后流中氮加工对再湿润期的快速响应。尽管每年都处于干旱状态，但这种对过程N的高复原力应被视为由临时水流提供的重要生态系统服务。

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  • 来源
    《Aquatic Sciences》 |2014年第2期|173-186|共14页
  • 作者

    Maria Isabel Arce; Maria del Mar Sanchez-Montoya; Maria Rosario Vidal-Abarca; Maria Luisa Suarez; Rosa Gomez;

  • 作者单位

    Department of Ecology and Hydrology, Faculty of Biology, Regional Campus of International Excellence 'Campus Mare Nostrum', University of Murcia, Campus of Espinardo, 30100 Murcia, Spain,Leibniz-Institute of Freshwater Ecology and Inland Fisheries (IGB), Mueggelseedamm 301, 12587 Berlin, Germany;

    Department of Ecology and Hydrology, Faculty of Biology, Regional Campus of International Excellence 'Campus Mare Nostrum', University of Murcia, Campus of Espinardo, 30100 Murcia, Spain;

    Department of Ecology and Hydrology, Faculty of Biology, Regional Campus of International Excellence 'Campus Mare Nostrum', University of Murcia, Campus of Espinardo, 30100 Murcia, Spain;

    Department of Ecology and Hydrology, Faculty of Biology, Regional Campus of International Excellence 'Campus Mare Nostrum', University of Murcia, Campus of Espinardo, 30100 Murcia, Spain;

    Department of Ecology and Hydrology, Faculty of Biology, Regional Campus of International Excellence 'Campus Mare Nostrum', University of Murcia, Campus of Espinardo, 30100 Murcia, Spain;

  • 收录信息 美国《科学引文索引》(SCI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Flow intermittency; Nitrification; Denitrification; Nitrate pulse; Temporary streams; Mediterranean streams;

    机译：流量间歇性;硝化作用反硝化;硝酸盐脉冲临时流;地中海溪流;

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