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

Relationship between nitrogen isotope ratios of NO3− and N2O in vertical porewater profiles... 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 N. 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Soil Biology and Biochemistry Elsevier

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Publisher
Elsevier
Copyright
Copyright © 2018 Elsevier Ltd
ISSN
0038-0717
D.O.I.
10.1016/j.soilbio.2018.04.022
Publisher site
See Article on Publisher Site

Abstract

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 N. 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.

Journal

Soil Biology and BiochemistryElsevier

Published: Aug 1, 2018

References

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