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Transient Microsite Models of Denitrification: I. Model Development
Author(s) -
McConnaughey P. K.,
Bouldin D. R.
Publication year - 1985
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1985.03615995004900040019x
Subject(s) - denitrification , anaerobic exercise , nitrous oxide , diffusion , nitrate , chemistry , volume (thermodynamics) , transient (computer programming) , nitrite , thermodynamics , nitrogen , biology , physics , computer science , physiology , organic chemistry , operating system
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 (N 2 O) → dinitrogen (N 2 ). Anaerobic volume was described by an approximate solution to a moving boundary problem. Transient diffusion of NO − 3 , NO − 2 , N 2 O, and N 2 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 N 2 O reduction, and a competitive inhibition model. The use of an operational V max which reflects electron donor availability was proposed.