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首页> 外文期刊>Environmental Science & Technology >New Insights into the Source of Decadal Increases of Dissolved Organic Matter in Acid-Sensitive Lakes of the Northeastern United States
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New Insights into the Source of Decadal Increases of Dissolved Organic Matter in Acid-Sensitive Lakes of the Northeastern United States

机译：美国东北地区对酸敏感的湖泊中溶解有机物的年代际增加来源的新见解

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摘要

The last several decades have seen decreases in SO_4~(2-) deposition across the northeastern United States. As a result, SO_4~(2-) concentrations in lakes and streams have also decreased and many surface water bodies have become less acidic. During the same time period, there has been a concurrent increase in dissolved organic carbon (DOC) concentrations in many lakes and streams. We used fluorescence spectroscopy to characterize the dissolved organic matter (DOM) quality of archived samples from nine acid-sensitive lakes in Maine collected between 1993 and 2009, and determined that increased DOM contributions to lakes were primarily derived from litter and soil. All five lakes with increasing DOC trends demonstrated significant decreasing (i.e., more terrestrial) trends in fluorescence index (FI) and significant positive correlations between SO_4~(2-) and FI. This study used the chemical signature of terrestrial DOM to support the hypothesis that increased DOC concentrations in lakes and streams are driven by declining acid deposition and increased solubility of soil organic matter across a large area of the landscape.
机译：最近几十年来，美国东北部的SO_4〜（2-）沉积减少。结果，湖泊和溪流中的SO_4〜（2-）浓度也降低了，许多地表水体的酸性降低了。在同一时期，许多湖泊和溪流中溶解有机碳（DOC）的浓度同时增加。我们使用荧光光谱法表征了1993年至2009年间从缅因州的9个酸敏感湖泊收集的存档样品的溶解有机物（DOM）质量，并确定增加的DOM对湖泊的贡献主要来自凋落物和土壤。 DOC趋势增加的所有五个湖泊均表现出荧光指数（FI）的显着下降（即更多的陆地）趋势以及SO_4〜（2-）与FI之间的显着正相关。这项研究使用了陆地DOM的化学特征来支持这样的假说，即湖泊和溪流中DOC浓度的增加是由酸沉降的下降和整个景观区域中土壤有机质溶解度的增加所驱动的。

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  • 来源
    《Environmental Science & Technology》 |2012年第6期|p.3212-3219|共8页
  • 作者

    Michael D. SanClements; Gretchen P. Oelsner; Diane M. McKnight; John L. Stoddard; Sarah J. Nelson;

  • 作者单位

    Institute of Arctic and Alpine Research, University of Colorado Boulder, 1560 30th Street, Boulder, Colorado 80304, United States;

    U.S. Environmental Protection Agency, 200 SW 35th Street, Corvallis, Oregon 97333, United States,U.S. Geological Survey, 5338 Montgomery Blvd., Suite 400, Albuquerque, New Mexico 87109, United States;

    Institute of Arctic and Alpine Research, University of Colorado Boulder, 1560 30th Street, Boulder, Colorado 80304, United States;

    U.S. Environmental Protection Agency, 200 SW 35th Street, Corvallis, Oregon 97333, United States;

    Senator George J. Mitchell Center for Environmental and Watershed Research, 5710 Norman Smith Hall, University of Maine, Orono, Maine 04469, United States;

  • 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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  • 正文语种 eng
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