Articles | Volume 13, issue 6
https://doi.org/10.5194/bg-13-1821-2016
https://doi.org/10.5194/bg-13-1821-2016
Research article
 | 
29 Mar 2016
Research article |  | 29 Mar 2016

Application of the 15N gas-flux method for measuring in situ N2 and N2O fluxes due to denitrification in natural and semi-natural terrestrial ecosystems and comparison with the acetylene inhibition technique

Fotis Sgouridis, Andrew Stott, and Sami Ullah

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Cited articles

Aulakh, M., Doran, J., and Mosier, A.: Field-Evaluation of 4 Methods for Measuring Denitrification, Soil Sci. Soc. Am. J., 55, 1332–1338, 1991.
Baily, A., Watson, C. J., Laughlin, R., Matthews, D., McGeough, K., and Jordan, P.: Use of the 15 N gas flux method to measure the source and level of N2O and N2 emissions from grazed grassland, Nutr. Cycling Agroecosyst., 94, 287–298, 2012.
Bergsma, T., Ostrom, N., Emmons, M., and Robertson, G.: Measuring simultaneous fluxes from soil of N2O and N2 in the field using the (15)N-Gas “nonequilihrium” technique, Environ. Sci. Technol., 35, 4307–4312, 2001.
Boast, C., Mulvaney, R., and Baveye, P.: Evaluation of N-15 Tracer Techniques for Direct Measurement of Denitrification in Soil 1 Theory, Soil Sci. Soc. Am. J., 52, 1317–1322, 1988.
Bollmann, A. and Conrad, R.: Enhancement by acetylene of the decomposition of nitric oxide in soil, Soil Biol. Biochem., 29, 1057–1066, 1997.
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Short summary
Soil denitrification is considered the most un-constrained process in the global N cycle due to uncertain in situ N2 flux measurements, particularly in natural and semi-natural terrestrial ecosystems. The 15N gas-flux method was adapted by lowering the 15N tracer application rate to 0.04–0.5 kg 15N ha−1. The minimum detectable flux rates were 4 μg N m−2 h−1 and 0.2 ng N m−2 h−1 for the N2 and N2O fluxes respectively. The acetylene inhibition technique underestimated denitrification rates by a factor of 4.
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