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This article in SSSAJ

  1. Vol. 49 No. 4, p. 886-891
    Received: Aug 20, 1984
    Accepted: Feb 5, 1985

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Transient Microsite Models of Denitrification: I. Model Development1

  1. P. K. McConnaughey and
  2. D. R. Bouldin2



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 (NO3) → nitrite (NO2) → nitrous oxide (N2O) → dinitrogen (N2). Anaerobic volume was described by an approximate solution to a moving boundary problem. Transient diffusion of NO3, NO2, 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 NO3 and NO2 inhibition of N2O reduction, and a competitive inhibition model. The use of an operational Vmax which reflects electron donor availability was proposed.

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