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Long-Term Nitrogen Addition Alters the Composition of Soil-Derived Dissolved Organic Matter

  • Jun-Jian Wang
    Jun-Jian Wang
    Environmental NMR Centre and Department of Physical and Environmental Sciences, University of Toronto Scarborough, 1265 Military Trail, Toronto, ON M1C 1A4, Canada
  • Yina Liu
    Yina Liu
    Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
    More by Yina Liu
  • Richard D. Bowden
    Richard D. Bowden
    Department of Environmental Science, Allegheny College, Meadville, Pennsylvania 16335, United States
  • Kate Lajtha
    Kate Lajtha
    College of Crop and Soil Science, Oregon State University, Corvallis, Oregon 97331, United States
    More by Kate Lajtha
  • André J. Simpson
    André J. Simpson
    Environmental NMR Centre and Department of Physical and Environmental Sciences, University of Toronto Scarborough, 1265 Military Trail, Toronto, ON M1C 1A4, Canada
  • Wan-Ling Huang
    Wan-Ling Huang
    State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control, School of Environmental Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China
  • , and 
  • Myrna J. Simpson*
    Myrna J. Simpson
    Environmental NMR Centre and Department of Physical and Environmental Sciences, University of Toronto Scarborough, 1265 Military Trail, Toronto, ON M1C 1A4, Canada
    *E-mail: [email protected]. Tel: +416-287-7234. Fax: +416-287-7279.
Cite this: ACS Earth Space Chem. 2020, 4, 2, 189–201
Publication Date (Web):December 23, 2019
Copyright © 2019 American Chemical Society

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    Abstract Image

    Forest soil dissolved organic matter (DOM) is a major source of terrigenous dissolved organic carbon (DOC) that is an important component of biogeochemical cycles. While many studies have shown that DOM dynamics are regulated strongly by nitrogen availability, how continued or increasing deposition of reactive nitrogen to forests alters the molecular composition of soil DOM remains unexplored. We studied the storage and molecular-level composition of soil-derived DOM after 22 years of nitrogen addition in a temperate deciduous forest. Soil DOC quantity changes were small (+19.0 g/m2; ∼10% increase) but the molecular composition changed markedly. Indices based on optical spectroscopy suggested that DOM molecular size and aromaticity were elevated with nitrogen addition. Nuclear magnetic resonance analyses showed that DOM contained more carbohydrates and aromatics but less aliphatic compounds with nitrogen addition. Ultrahigh-resolution mass spectrometric analysis further supports the finding that solid-phase isolated DOM from nitrogen-added soils was larger in molecular size and aromaticity. Condensed aromatic dissolved black carbon, particularly those compounds with high molecular size/carbon number and those stored in deep soils, showed the greatest percent increase with nitrogen addition. These results countered our hypothesis that soluble carbohydrates would be selectively removed from the DOC pool compared to polyphenols and condensed aromatic components under nitrogen enrichment. These changes in DOM molecular composition may also impact microbial communities and downstream metabolism of DOC.

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    • Elemental composition of the solid-phase extracted dissolved organic matter as determined by Fourier transform ion cyclotron mass spectrometry; molecular characterization of the solid-phase extracted nitrogen-containing dissolved organic matter; example 1H–13C heteronuclear single quantum coherence; van Krevelen plots; and double bond equivalent versus carbon number plots (PDF)

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    Cited By

    This article is cited by 25 publications.

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