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Relationship between nitrogen isotope ratios of NO₃⁻ and N₂O in vertical porewater profiles through a polluted rain-fed peat bog

Title data

Novak, Martin ; Parra Suárez, Silvia ; Gebauer, Gerhard ; Thoma, Michael ; Buzek, Frantisek ; Cejkova, Bohuslava ; Jackova, Ivana ; Stepanova, Marketa ; Prechova, Eva ; Curik, Jan ; Veselovsky, Frantisek ; Valkova, Ivana ; Blaha, Vladimir ; Fottova, Daniela ; Komarek, Arnost:
Relationship between nitrogen isotope ratios of NO₃⁻ and N₂O in vertical porewater profiles through a polluted rain-fed peat bog.
In: Soil Biology & Biochemistry. Vol. 123 (2018) . - pp. 7-9.
ISSN 0038-0717
DOI: https://doi.org/10.1016/j.soilbio.2018.04.022

Abstract in another language

We report a combination of δ¹⁵N-NO₃⁻ and δ¹⁵N-N₂O values along vertical porewater profiles through a Sphagnum-dominated, high-elevation peat bog. Our objective was to distinguish between N₂O production from NO₃⁻ via denitrification and N₂O consumption via reduction to N₂. Nitrate-N in runoff was isotopically heavier than NO₃⁻-N in atmospheric deposition, indicating export of organically-cycled NO₃⁻. Constant N₂O concentrations in porewater profiles contrasted with a shift toward higher δ¹⁵N-N₂O values upward. In the 60-30 cm depth interval, a significant negative correlation between δ¹⁵N-NO₃⁻ and δ¹⁵N-N₂O values was observed. Higher δ¹⁵N values of residual NO₃⁻ in the deepest peat layer reflected higher rates of NO₃⁻ reduction. Isotopically heavier N₂O-N at shallower depths corresponded to residual N₂O following partial reduction to N₂.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER145419
Institutions of the University: Research Institutions
Research Institutions > Research Centres
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 03 Apr 2019 13:43
Last Modified: 03 Apr 2019 13:43
URI: https://eref.uni-bayreuth.de/id/eprint/48229