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Published in Soil Sci Soc Am J 52:1317-1322 (1988)
© 1988 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Evaluation of Nitrogen-15 Tracer Techniques for Direct Measurement of Denitrification in Soil: I. Theory

C. W. Boast*, R. L. Mulvaney and P. Baveye

Dep. of Agronomy, 1102 S. Goodwin Ave., Univ. of Illinois, Urbana, IL 61801

*Corresponding author.

ABSTRACT

Mass spectrometric procedures for determination of dinitrogen (N2) and nitrous oxide (N2O) evolved during denitrification in soil treated with 15N-labeled fertilizer are based on the hypothesis that the nitrate (NO–3) undergoing denitrification can be assumed to exist in a single pool that is isotopically uniform. In the work reported, it is shown that 15XN (the average mole fraction of 15N in the NO–3 undergoing denitrification) will be overestimated when this assumption is invalid. Moreover, it is proved mathematically that the amount of N2 or N2O evolved is underestimated when 15XN does not exceed 0.5. This proof does not hold for higher values of 15XN, but it is concluded that underestimation also occurs in these cases, because no exceptions were found in over three million computer simulations involving evolution of N2 from multiple pools having 15N enrichments as high as 99.6 atom %.

NOTES

This study was a part of Projects ILLU-15-0356 and ILLU-15-0392, Illinois Agric. Exp. Stn. Supported in part by the Tennessee Valley Authority.

Received for publication June 29, 1987.


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