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The Influence of Nitrate, Nitrite, and Oxygen on the Composition of the Gaseous Products of Denitrification in Soil¹

ABSTRACT

[¹⁸N]-N₂O produced by denitrification of ¹⁸NO^-₃ in soil slurries readily exchanged with nonlabeled pools of added N₂O. This supports the role of N₂O as a free, obligate intermediate of denitrification in soils. The observation that N₂O diffuses freely from the site of active denitrification in soils means that any factor which produces a change in the relative rate of N₂O reduction compared to the rate of N₂O production can alter the proportion of N₂O and N₂ resulting. Increased concentration of NO₃^- and NO₂^- resulted in increased production of N₂O relative to N₂ as the product of denitrification. The influence of NO₂^- was much stronger than that of NO₃^-, with low concentrations of NO₂^- causing N₂O to become a significant product of denitrification. This suggests that NO₂^-, not NO₃^-, may be the influential species. Additions of small quantities of O₂ (0.02 atm) caused a large decrease in denitrification activity and resulted in a significant increase in the N₂O/N₂ ratio.

¹ Contribution from the Dept. of Crop and Soil Sciences, Dept. of Microbiology and Public Health, and the Heavy Ion Laboratory, Michigan State Univ., E. Lansing, MI 48824. Journal Article no. 8808 of the Michigan Agric. Exp. Stn. This work was supported by NSF Grants DEB-77-19273 and PHY-78-01684 and USDA Regional Research Project NE-39.

² Former Graduate Students, Assistant Professor of Chemistry, and Professor of Soil Microbiology, respectively. Current addresses are M.K.F., Dept. of Soils and Plant Nutrition, Univ. of Calif., Berkeley, M.S.S., Dept. of Agronomy, Univ. of Kentucky, and R.B.F., Lawrence Berkeley Laboratory, Univ. of Calif., Berkeley.

Received for publication December 4, 1978. Accepted for publication July 11, 1979.

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