1. General Model Information

Name: Dynamics of partial anaerobiosis, denitrification and water in soil

Acronym: DENLEFWAT

Main medium: terrestrial
Main subject: biogeochemistry
Organization level: population
Type of model: ordinary differential equations, partial differential equations
Main application:
Keywords: aggregate level, soil, biological respiration, biological denitrification, water transport, solute transport, gas transport

Contact:

Dr.ir. P.A. Leffelaar
Wageningen Agricultural University
Dept. Theoretical Production Ecology
P.O.Box 430
6700 AK Wageningen
THE NETHERLANDS
Phone: +31.8370.83918/82141
Fax : +31.8370.84892
email: leffelaar@rcl.wau.nl

Author(s):

P.A. Leffelaar and W.W. Wessel.

Abstract:

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

II.1 Executables:

Operating System(s): VAX, PC

II.2 Source-code:

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

II.3 Manuals:

A number of student reports are available about preliminary versions of the denitrification module and the water module.

II.4 Data:

III. Mathematical Information

III.1 Mathematics

Number of rate variables: 18, excluding the spatial subdivision of these state variables. Including the spatial

III.2 Quantities

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,

III.2.1 Input

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

III.2.2 Output

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.

IV. References

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