N<sub>2</sub>O isotope approaches for source partitioning of N<sub>2</sub>O production and estimation of N<sub>2</sub>O reduction – validation with the <sup>15</sup>N gas-flux method in laboratory and field studies
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Published:2020-11-14
Issue:22
Volume:17
Page:5513-5537
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ISSN:1726-4189
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Container-title:Biogeosciences
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language:en
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Short-container-title:Biogeosciences
Author:
Lewicka-Szczebak DominikaORCID, Lewicki Maciej PiotrORCID, Well Reinhard
Abstract
Abstract. The approaches based on natural abundance N2O stable
isotopes are often applied for the estimation of mixing proportions
between various N2O-producing pathways as well as for
estimation of the extent of N2O reduction to
N2. But such applications are associated with numerous
uncertainties; hence, their limited accuracy needs to be considered.
Here we present the first systematic validation of these methods for
laboratory and field studies by applying the 15N gas-flux
method as the reference approach. Besides applying dual-isotope plots for interpretation of
N2O isotopic data, for the first time we propose a three
dimensional N2O isotopocule model based on Bayesian
statistics to estimate the N2O mixing proportions and
reduction extent based simultaneously on three N2O isotopic
signatures (δ15N, δ15NSP, and
δ18O). Determination of the mixing proportions of
individual pathways with N2O isotopic approaches often appears
imprecise, mainly due to imperfect isotopic separation of the
particular pathways. Nevertheless, the estimation of N2O
reduction is much more robust, when applying an optimal calculation
strategy, typically reaching an accuracy of N2O residual
fraction determination of about 0.15.
Funder
Deutsche Forschungsgemeinschaft
Publisher
Copernicus GmbH
Subject
Earth-Surface Processes,Ecology, Evolution, Behavior and Systematics
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