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首页> 外文期刊>Environmental Science & Technology >Linking the Molecular Signature of Heteroatomic Dissolved Organic Matter to Watershed Characteristics in World Rivers
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Linking the Molecular Signature of Heteroatomic Dissolved Organic Matter to Watershed Characteristics in World Rivers

机译：将杂原子溶解有机物的分子标记与世界河流的流域特征联系起来

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摘要

Large world rivers are significant sources of dissolved organic matter (DOM) to the oceans. Watershed geomorphology and land use can drive the quality and reactivity of DOM. Determining the molecular composition of riverine DOM is essential for understanding its source, mobility and fate across landscapes. In this study, DOM from the main stem of 10 global rivers covering a wide climatic range and land use features was molecularly characterized via ultrahigh-resolution Fourier-transform ion cyclotron resonance mass spectrometry (FT-ICR-MS). FT-ICR mass spectral data revealed an overall similarity in molecular components among the rivers. However, when focusing specifically on the contribution of nonoxygen heteroatomic molecular formulas (CHON, CHOS, CHOP, etc.) to the bulk molecular signature, patterns relating DOM composition and watershed land use became apparent. Greater abundances of N- and S-containing molecular formulas were identified as unique to rivers influenced by anthropogenic inputs, whereas rivers with primarily forested watersheds had DOM signatures relatively depleted in heteroatomic content. A strong correlation between cropland cover and dissolved black nitrogen was established when focusing specifically on the pyrogenic class of compounds. This study demonstrated how changes in land use directly affect downstream DOM quality and could impact C and nutrient cycling on a global scale.
机译：世界大河是海洋中溶解有机物（DOM）的重要来源。流域地貌和土地利用可以推动DOM的质量和反应性。确定河流DOM的分子组成对于了解其在景观中的来源，流动性和命运至关重要。在这项研究中，通过超高分辨率傅里叶变换离子回旋共振质谱（FT-ICR-MS）对10条全球性河流的主干中的DOM进行了分子表征，这些DOM覆盖了广泛的气候范围和土地利用特征。 FT-ICR质谱数据揭示了河流之间分子成分的总体相似性。但是，当特别关注非氧杂原子分子式（CHON，CHOS，CHOP等）对整体分子标记的贡献时，与DOM组成和流域土地利用有关的模式就变得很明显。大量的含N和S的分子式被确定为受人为输入影响的河流所特有的，而主要是森林流域的河流的DOM特征则相对减少了杂原子含量。当特别关注化合物的热解类型时，农田覆盖与溶解的黑氮之间建立了很强的相关性。这项研究表明，土地利用的变化如何直接影响下游DOM的质量，并可能在全球范围内影响碳和养分循环。

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  • 来源
    《Environmental Science & Technology》 |2015年第23期|13798-13806|共9页
  • 作者

    Sasha Wagner; Thomas Riedel; Jutta Niggemann; Anssi V. Vaehaetalo; Thorsten Dittmar; Rudolf Jaffe;

  • 作者单位

    Florida International University, Southeast Environmental Research Center and Department of Chemistry and Biochemistry, Biscayne Bay Campus, North Miami, Florida 33181, United States;

    Carl von Ossietzky University of Oldenburg, Institute for Chemistry and Biology of the Marine Environment, Research Group for Marine Geochemistry (ICBM-MPI Bridging Group), 26129 Oldenburg, Germany;

    Carl von Ossietzky University of Oldenburg, Institute for Chemistry and Biology of the Marine Environment, Research Group for Marine Geochemistry (ICBM-MPI Bridging Group), 26129 Oldenburg, Germany;

    University of Jyvaeskylae, Department of Biological and Environmental Sciences, 40500 Jyvaeskylae, Finland;

    Carl von Ossietzky University of Oldenburg, Institute for Chemistry and Biology of the Marine Environment, Research Group for Marine Geochemistry (ICBM-MPI Bridging Group), 26129 Oldenburg, Germany;

    Florida International University, Southeast Environmental Research Center and Department of Chemistry and Biochemistry, Biscayne Bay Campus, North Miami, Florida 33181, 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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