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首页> 外文期刊>Environmental Science & Technology >Steady-State Land Cover but Non-Steady-State Major Ion Chemistry in Urban Streams
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Steady-State Land Cover but Non-Steady-State Major Ion Chemistry in Urban Streams

机译：城市河流中的稳态土地覆盖但非稳态的主要离子化学

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摘要

Sources of many major ions in urban streams remain ambiguous, particularly for ions unrelated to deicing salt use, and temporal patterns in concentrations are unstudied. We used 16 years of water chemistry data based on weekly samples from the Baltimore, MD, USA, metropolitan area and the Weighted Regressions on Time, Discharge, and Season approach to investigate connections between major ions, land cover, and time. All watersheds were underlain by silicate bedrock, contained no regulated point sources, and had stable land cover. Major ion concentrations were higher with greater urban land cover. Notably, concentrations of most ions increased with time in (sub)urban streams and had higher annual variability than in watersheds without impervious surface cover. Nonpoint source contributions from deicing salt and concrete were the predominant influences on major ion concentrations and produced stream chemistry that was distinctly different from forested streams. The novel finding that concentrations of most major ions were not only elevated but increasing in urban streams even with no substantial changes in land cover during the study period has important implications for ecosystem health and water quality, particularly given recent work demonstrating the high correlation between elevated ion concentrations and changes in freshwater biotic communities.
机译：城市河流中许多主要离子的来源仍然模棱两可，特别是对于与除冰盐的使用无关的离子而言，并且浓度的时间模式尚未研究。我们使用了16年的水化学数据，这些数据是根据美国马里兰州巴尔的摩市，大都市区的每周样本以及时间，流量和季节的加权回归方法来调查主要离子，土地覆盖物和时间之间的联系的。所有集水区都被硅酸盐基岩所覆盖，没有任何可调节的点源，并且具有稳定的土地覆盖。随着城市土地覆盖面积的增加，主要离子浓度更高。值得注意的是，与（不）表面覆盖不透水的流域相比，（亚）城市河流中大多数离子的浓度随时间增加，并且年度变化性更高。除冰盐和混凝土的非点源贡献是主要离子浓度和产生的流化学的主要影响，这与森林流明显不同。这项新颖的发现表明，即使在研究期间大部分土地上的主要离子浓度不仅升高，而且在城市溪流中增加，即使土地覆盖率没有实质性变化，也对生态系统健康和水质产生重要影响，特别是考虑到最近的工作表明，高浓度离子之间的高度相关性离子浓度和淡水生物群落的变化。

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  • 来源
    《Environmental Science & Technology》 |2018年第22期|13015-13026|共12页
  • 作者

    Bird Darcy L.; Groffman Peter M.; Salice Christopher J.; Moore Joel;

  • 作者单位

    Towson Univ, Environm Sci & Studies Program, 8000 York Rd, Towson, MD 21252 USA;

    Towson Univ, Dept Biol Sci, 8000 York Rd, Towson, MD 21252 USA;

    CUNY Brooklyn Coll, Adv Sci Res Ctr, Grad Ctr, Dept Earth & Environm Sci, New York, NY 10031 USA;

    Cary Inst Ecosyst Studies, Millbrook, NY 12545 USA;

    Towson Univ, Dept Phys Astron & Geosci, 8000 York Rd, Towson, MD 21252 USA;

  • 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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