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首页> 外文期刊>Marine ecology progress series >Assimilation and regeneration of inorganic nitrogen in a coastal upwelling system: ammonium and nitrate utilization
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Assimilation and regeneration of inorganic nitrogen in a coastal upwelling system: ammonium and nitrate utilization

机译：沿海上升流系统中无机氮的吸收和再生：铵和硝酸盐的利用

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摘要

The main processes involved in nitrogen cycling (as NO_3~- and NH_4~+ assimilation and their regeneration) were studied using N-tracer experiments in the coastal upwelling system off central Chile (36° S). The study area shows seasonal surface fertilization and the development of subsurface hypoxia in austral spring and summer. The rates of NO_3~- uptake during active upwelling were 5 times higher than in non-upwelling seasons. Uptake of NH_4~+ was almost half that of NO_3~- uptake rates during upwelling periods, and similar to NO_3~- uptake rates in the absence of upwelling. Nitrification experiments showed higher rates during active, compared to non-active, upwelling seasons. NH_4~+ oxidation was coupled with NO_3~- oxidation in near bottom (suboxic) waters, while in the oxycline (hypoxic water), total fluxes of NO_3~- regeneration via nitrification resulted from higher activity of NO_2~- oxidation compared to NH_4~+ oxidation. On the other hand, archaeal NH_4~+ oxidation had the potential for processing a large fraction of NH_4~+ and could therefore co-occur with bacterial NO_2~- oxidation. NH_4~+ utilization in this coastal upwelling is thus in the same range as NO_3~- assimilation. NH_4~+ oxidation is affected by oxygen concentration in the water column, leading to occasional decoupling of NH_4~+ and NO_2~-oxidation, particularly at the oxycline. This study gives preliminary evidence of the importance of archaeal-bacterial interactions in the nitrification process and highlights the role of ammonium in fueling annual primary production in coastal upwelling systems.
机译：在智利中部（36°S）沿海上升流系统中，使用N-示踪剂实验研究了氮循环的主要过程（NO_3〜-和NH_4〜+的同化及其再生）。研究区域显示了春季和夏季南方季节性施肥和地下低氧的发展。主动上升流期间NO_3〜-吸收的速率是非上升流季节的5倍。在上升期，NH_4〜+的吸收量几乎是NO_3〜-吸收率的一半，与没有上升流的NO_3〜-吸收率相似。硝化实验显示，与非活跃上升季节相比，活跃期间的比率更高。 NH_4〜+的氧化与NO_3〜-的氧化在近底部（碱性）水域结合，而在氧气线（低氧水）中，NO_2〜-的总活性通量由硝化产生，这比NH_4〜的活性更高。 +氧化。另一方面，古细菌NH_4〜+氧化具有处理大部分NH_4〜+的潜力，因此可能与细菌NO_2〜-氧化同时发生。因此，该沿海上升流中的NH_4〜+利用率与NO_3〜-同化范围相同。 NH_4〜+的氧化受水柱中氧气浓度的影响，导致NH_4〜+和NO_2〜-氧化的偶发解耦，尤其是在氧代克林上。这项研究提供了古细菌与细菌相互作用在硝化过程中的重要性的初步证据，并着重指出了铵在沿海上升流系统中为年度初级生产提供燃料的作用。

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  • 来源
    《Marine ecology progress series》 |2012年第11期|p.1-14|共14页
  • 作者

    C. Fernandez; L. Farias;

  • 作者单位

    UPMC Unlv Paris 06 and CNRS, UMR 7621, LOMIC, Observatoire Oceanologique, 66651, Banyuls/mer, France Departamento de Oceanografia, Centro de Investigacion Oceanografica en el Paciiico Sudoriental (COPAS),Unlversidad de Concepcion, Concepcion, Chile;

    Departamento de Oceanografia, Centro de Investigacion Oceanografica en el Paciiico Sudoriental (COPAS),Unlversidad de Concepcion, Concepcion, Chile Laboratorio de Procesos Oceanograficos y Clima, Universidad de Concepcion, Casilla 160-C, Concepcion, Chile;

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  • 正文语种 eng
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  • 关键词

    coastal upwelling; nitrogen uptake; ammonium oxidation; archaea;

    机译：沿海上升流;氮吸收铵氧化古细菌;

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