![]() Relative Magnitude and Controls of in Situ N2 and N2O Fluxes due to Denitrification in Natural and Seminatural Terrestrial Ecosystems Using 15N Tracers. Environmental Science & Technology 2019, 53 In Situ Quantification of Biological N2 Production Using Naturally Occurring 15N15N. This article is cited by 35 publications. ![]() Applying the 15N-gas nonequilibrium technique to N 2O complements its use for 15N−N 2 analysis when studying the relative production of N 2O and N 2 during denitrification. The 15N enrichment of the soil mineral pool undergoing denitrification, measured nondestructively using the N 2O data, dropped from about 0.82 to 0.72 atom fraction 15N over 4 days. For N 2O flux, the 15N-gas technique and gas chromatography technique agreed well ( r = 0.98). N 2O flux ranged from 0.0002 to 0.0027 g N 2O−N N 2 flux ranged from below detection limit (<0.022 g ![]() Nine chamber incubations were conducted over 4 days. In the field, we measured flux of N 2 and N 2O during soil denitrification from a 15N-labeled plot of winter wheat. Our system accurately measured the 15N enrichments of labeled soil slurries for both N 2 and N 2O. We accommodated analysis of N 2O by modifying the head amplifier of our mass spectrometer. Our purpose was to measure simultaneous fluxes from soil of both N 2O and N 2 from the same plot in the field using the 15N-gas “nonequilibrium” technique (i.e., the “Hauck” technique) as used previously for N 2.
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