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首页> 外文期刊>Estuarine Coastal and Shelf Science >Autochthonous organic matter promotes DNRA and suppresses N_2O production in sediments of the coastal Baltic Sea
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Autochthonous organic matter promotes DNRA and suppresses N_2O production in sediments of the coastal Baltic Sea

机译：自身加热的有机物促进DNRA并抑制沿海波罗的海沉积物中的N_2O生产

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摘要

Coastal environments are nitrogen (N) removal hot spots, which regulate the amount of land-derived N reaching the open sea. However, mixing between freshwater and seawater creates gradients of inorganic N and bioavailable organic matter, which affect N cycling. In this study, we compare nitrate reduction processes between estuary and offshore archipelago environments in the coastal Baltic Sea. Denitrification rates were similar in both environments, despite lower nitrate and carbon concentrations in the offshore archipelago. However, DNRA (dissimilatory nitrate reduction to ammonium) rates were higher at the offshore archipelago stations, with a higher proportion of autochthonous carbon. The production rate and concentrations of the greenhouse gas nitrous oxide (N2O) were higher in the estuary, where nitrate concentrations and allochthonous carbon inputs are higher. These results indicate that the ratio between nitrate and autochthonous organic carbon governs the balance between N-removing denitrification and N-recycling DNRA, as well as the end-product of denitrification. As a result, a significant amount of the N removed in the estuary is released as N2O, while the offshore archipelago areas are characterized by efficient internal recycling of N. Our results challenge the current understanding of the role of these regions as filters of land-to-sea transfer of N.
机译：沿海环境是氮气（n）去除热点，其调节到达海洋的陆地N的数量。然而，淡水和海水之间的混合会产生无机N和生物可利用的有机物的梯度，这会影响n循环。在这项研究中，我们比较沿海波罗的海河口和海上群岛环境之间的硝酸盐减少过程。尽管近海群岛中的硝酸盐和碳浓度降低，但两种环境中的反硝化率相似。然而，海上群岛站的DNRA（硝酸盐还原对铵）率较高，其含有较高的自加碳碳比例。温室气体二氮氧化物（N2O）的生产率和浓度在河口中较高，其中硝酸盐浓度和表发碳投入较高。这些结果表明，硝酸盐和自身加压有机碳之间的比率治理了N-除去反硝化和N-再循环DNRO之间的平衡，以及反硝化的最终产物。结果，河口中删除的大量纳米被释放为N2O，而离岸群岛区域的特点是N的有效内部再循环。我们的结果挑战了对这些地区作为土地过滤器的作用的挑战对n的海上转移。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2021年第5期|107369.1-107369.9|共9页
  • 作者

    Aalto Sanni L.; Asmala Eero; Jilbert Tom; Hietanen Susanna;

  • 作者单位

    Univ Eastern Finland Dept Environm & Biol Sci POB 1627 Kuopio 70211 Finland|Univ Jyvaskyla Dept Biol & Environm Sci POB 35 Jyvaskyla 40014 Finland|Tech Univ Denmark North Sea Res Ctr Sect Aquaculture DTU Aqua POB 101 DK-9850 Hirtshals Denmark;

    Univ Helsinki Tvarminne Zool Stn Hango 10900 Finland;

    Univ Helsinki Tvarminne Zool Stn Hango 10900 Finland|Univ Helsinki Fac Biol & Environm Sci Ecosyst & Environm Res Program Helsinki 00014 Finland;

    Univ Helsinki Tvarminne Zool Stn Hango 10900 Finland|Univ Helsinki Fac Biol & Environm Sci Ecosyst & Environm Res Program Helsinki 00014 Finland;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Denitrification; DNRA; DOM; Estuary; N2O; Sediment organic matter;

    机译：脱氮;DNRA;DOM;河口;N2O;沉积物有机物;

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