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Transient Microsite Models of Denitrification: I. Model Development¹

ABSTRACT

Past models of denitrification are reviewed. None of these models include a description of anaerobic volume and transient solute diffusion to and away from zones of N reduction. In this paper, models describing denitrification in the anaerobic zone of a saturated homogeneous soil are presented. The models consider the reduction sequence: nitrate (NO^–₃) nitrite (NO^–₂) nitrous oxide (N₂O) dinitrogen (N₂). Anaerobic volume was described by an approximate solution to a moving boundary problem. Transient diffusion of NO^–₃, NO^–₂, N₂O, and N₂ was allowed throughout the saturated soil, while reduction of the nitrogenous species occurred only in the anaerobic region. Four types of reaction terms were considered, resulting in a zero-order model, a Michaelis-Menten model with differential rates of reduction, a Michaelis-Menten model with NO^–₃ and NO^–₂ inhibition of N₂O reduction, and a competitive inhibition model. The use of an operational V_max which reflects electron donor availability was proposed.

¹ Contribution from Dep. of Agronomy, Cornell Univ., Ithaca NY 14853.

² Formerly Graduate Research Asst. and Professor of Soil Science, respectively, Cornell Univ., Ithaca NY 14853. Senior Author is currently Asst. Prof. of Soil Science, Dep. of Agronomy, Mississippi State Univ., Mississippi State, MS 39762.

Received for publication August 20, 1984. Accepted for publication February 5, 1985.

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