Seasonal photochemical transformations of nitrogen species in a forest stream and lake.

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  • Author(s): Porcal P;Porcal P; Kopáček J; Kopáček J; Tomková I; Tomková I
  • Source:
    PloS one [PLoS One] 2014 Dec 31; Vol. 9 (12), pp. e116364. Date of Electronic Publication: 2014 Dec 31 (Print Publication: 2014).
  • Publication Type:
    Journal Article; Research Support, Non-U.S. Gov't
  • Language:
    English
  • Additional Information
    • Source:
      Publisher: Public Library of Science Country of Publication: United States NLM ID: 101285081 Publication Model: eCollection Cited Medium: Internet ISSN: 1932-6203 (Electronic) Linking ISSN: 19326203 NLM ISO Abbreviation: PLoS One Subsets: MEDLINE
    • Publication Information:
      Original Publication: San Francisco, CA : Public Library of Science
    • Subject Terms:
      Forests* ; Photochemical Processes*; Lakes/*chemistry ; Nitrogen/*chemistry ; Rivers/*chemistry; Austria ; Czech Republic ; Iron/chemistry ; Kinetics ; Models, Theoretical ; Nitrogen/analysis ; Seasons
    • Abstract:
      The photochemical release of inorganic nitrogen from dissolved organic matter is an important source of bio-available nitrogen (N) in N-limited aquatic ecosystems. We conducted photochemical experiments and used mathematical models based on pseudo-first-order reaction kinetics to quantify the photochemical transformations of individual N species and their seasonal effects on N cycling in a mountain forest stream and lake (Plešné Lake, Czech Republic). Results from laboratory experiments on photochemical changes in N speciation were compared to measured lake N budgets. Concentrations of organic nitrogen (Norg; 40-58 µmol L-1) decreased from 3 to 26% during 48-hour laboratory irradiation (an equivalent of 4-5 days of natural solar insolation) due to photochemical mineralization to ammonium (NH4+) and other N forms (Nx; possibly N oxides and N2). In addition to Norg mineralization, Nx also originated from photochemical nitrate (NO3-) reduction. Laboratory exposure of a first-order forest stream water samples showed a high amount of seasonality, with the maximum rates of Norg mineralization and NH4+ production in winter and spring, and the maximum NO3- reduction occurring in summer. These photochemical changes could have an ecologically significant effect on NH4+ concentrations in streams (doubling their terrestrial fluxes from soils) and on concentrations of dissolved Norg in the lake. In contrast, photochemical reactions reduced NO3- fluxes by a negligible (<1%) amount and had a negligible effect on the aquatic cycle of this N form.
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    • Accession Number:
      E1UOL152H7 (Iron)
      N762921K75 (Nitrogen)
    • Publication Date:
      Date Created: 20150101 Date Completed: 20160112 Latest Revision: 20181113
    • Publication Date:
      20240104
    • Accession Number:
      PMC4281116
    • Accession Number:
      10.1371/journal.pone.0116364
    • Accession Number:
      25551441