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Nonlinear Response of Riverine N_2O Fluxes to Oxygen and Temperature

机译：河水N_2O通量对氧气和温度的非线性响应

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摘要

One-quarter of anthropogenically produced nitrous oxide (N_2O) comes from rivers and estuaries. Countries reporting N_2O fluxes from aquatic surfaces under the United Nations Framework Convention on Climate Change typically estimate anthropogenic inorganic nitrogen loading and assume a fraction becomes N_2O. However, several studies have not confirmed a linear relationship between dissolved nitrate (NO_3~-) and river N_2O fluxes. We apply recursive partitioning analysis to examine the relationships between N_2O flux and NO_3~-, dissolved oxygen (DO), temperature, land use and surficial geology in the Grand River, Canada, a seventh-order river in an agricultural catchment with substantial urban population. Results suggest that N_2O flux is high when hypoxia exists. Temperature, not NO_3~-, was the primary correlate of N_2O flux when hypoxia does not occur suggesting NO_3~- is not limiting N_2O production and further increases in NO_3~- may not lead to comparable increases in N_2O flux. This work indicates that a linear relationship between NO_3~- and N_2O is unlikely to exist in most agricultural and urban impacted river systems. Most N_2O is produced during hypoxia so quantifying the extent of hypoxia is a necessary first step to quantifying N_2O fluxes in Iotic systems. Predicted increases in riverine hypoxia via eutrophication and increased temperature due to climate change may drive nonlinear increases in N_2O production.
机译：人为产生的一氧化二氮（N_2O）的四分之一来自河流和河口。根据《联合国气候变化框架公约》从水面排放N_2O通量的国家通常会估算人为造成的无机氮负荷，并假设一部分变为N_2O。然而，一些研究尚未证实溶解的硝酸盐（NO_3〜-）与河流N_2O通量之间存在线性关系。我们应用递归分区分析方法研究了加拿大大河（城市人口众多的农业流域的七阶河）中N_2O通量与NO_3〜-，溶解氧（DO），温度，土地利用和表层地质之间的关系。 。结果表明，存在缺氧时N_2O通量较高。当不发生缺氧时，温度而不是NO_3〜-是N_2O通量的主要相关因素，这表明NO_3〜-并不限制N_2O的产生，并且NO_3〜-的进一步增加可能不会导致N_2O通量的可比增加。这项工作表明，在大多数受农业和城市影响的河流系统中，NO_3〜-和N_2O之间不存在线性关系。大多数N_2O是在缺氧期间产生的，因此量化缺氧的程度是量化Iotic系统中N_2O通量的必要的第一步。由于富营养化而导致的河流缺氧的预计增加以及由于气候变化导致的温度升高可能会推动N_2O产量的非线性增加。

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  • 来源
    《Environmental Science & Technology》 |2014年第3期|1566-1573|共8页
  • 作者

    Jason J. Venkiteswaran; Madeline S. Rosamond; Sherry L. Schiff;

  • 作者单位

    Department of Earth and Environmental Sciences, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada;

    Department of Earth and Environmental Sciences, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada;

    Department of Earth and Environmental Sciences, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada;

  • 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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