1. General Model Information
Name: Dynamics of partial anaerobiosis, denitrification and water in soil
Main medium: terrestrial
Main subject: biogeochemistry
Organization level: population
Type of model: ordinary differential equations, partial differential equations
Keywords: aggregate level, soil, biological respiration, biological denitrification, water transport, solute transport, gas transport
Dr.ir. P.A. Leffelaar
Wageningen Agricultural University
Dept. Theoretical Production Ecology
6700 AK Wageningen
Fax : +31.8370.84892
P.A. Leffelaar and W.W. Wessel.
The model (DENLEFWAT) gives a detailed description of the processes of
respiration and denitrification as affected by and as affecting the
surroundings in an individual soil aggregate. The model comprises four
submodels: i) biological respiration and denitrification, ii) water transport
including a description to account for hysteresis, iii) solute transport, and
iv) gas transport including a new description to simulate the integral soil
atmosphere. The submodels were experimentally tested to a large extent. The
denitrification module has been used by Li, Frolking and Frolking (1992,
Journal of Geophysical Research 97: 9759-) to study nitrous oxide evolution
from field soils.
Author of the abstract:
CAMASE Register of Agro-ecosystems Models
II. Technical Information
Operating System(s): VAX, PC
Programming Language(s): CSMP 5% /(standard) FORTRAN 95% Other software required: CSMP* (VAX) or PCSMP*, and FORTRAN plus the IMSL library. Source Code is available (no costs) from the author
A number of student reports are available about preliminary versions of the denitrification module and the water module.
III. Mathematical Information
Number of rate variables: 18, excluding the spatial subdivision of these state variables. Including the spatial
Number of rate variables: 18, excluding the spatial subdivision of these state variables. Including the spatialsubdivision about 225.
State variables: Soil water, gas mixtures (e.g. oxygen, carbon dioxide, nitrous oxide, molecular nitrogen),microbial biomass (strickt aerobes and denitrifiers), (simple) organic matter.
Number of state variables: See 'Number of state variables'. Soil water characteristics, initial gas pressures, microbiological data like yield coefficients,
Soil water characteristics, initial gas pressures, microbiological data like yield coefficients,maintenance coefficients, relative growth rates, initial biomasses, Michaelis-Menten kinetical data, gas data tocalculate binary diffusion coefficients. A great number of output data files is produced. These may be inspected on the screen and
A great number of output data files is produced. These may be inspected on the screen andselections may be printed. Output concerns all the state variables and most of the rate variables. The maximum time step amounts to 5 seconds, and is strongly dependent on thespatial resolution and the non-linearity of the problem (for 5 seconds maximum time step the spatial co-ordinate is2 to 5 millimetre).
Basic spatial unit: A soil aggregate is simulated.
Leffelaar, P.A., 1986. Dynamics of partial anaerobiosis, denitrification, and water in a soil aggregate:experimental. Soil Science 142: 352-366
Leffelaar, P.A. & W.W. Wessel., 1988. Denitrification in a homogeneous, closed system: experiment and simulation. Soil Science 146: 335-349
Leffelaar, P.A., 1988. Dynamics of partial anaerobiosis, denitrification, and water in a soil aggregate: simulation.Soil Science 146: 427-444
V. Further information in the World-Wide-Web
VI. Additional remarks
Last review of this document by: T. Gabele: 17. 09. 1997 -
Status of the document:
last modified by
Joachim Benz Mon Jul 2 18:31:37 CEST 2007