1. General Model Information

Name: MOdelling Soil Organic Matter

Acronym: MOSOM

Main medium: terrestrial
Main subject: biogeochemistry
Organization level: ecosystem
Type of model: compartment model
Main application:
Keywords: soil, mineralisation, carbon cycling, nitrogen cycle, soil organic matter, first order kinetics


Dr. A.P. Whitmore.
Research Institute for Agrobiology and Soil Fertility (AB-DLO)
P.O.Box 129, 9750AC Haren (Gr.)
Phone: +31.50.5337303
Fax : +31.50.5337291
Email: a.p.whitmore@ab.dlo.nl

Dr.ir. A. Gorissen
Research Institute for Agrobiology and Soil Fertility (AB-DLO)
P.O.Box 14, 6700
AA Wageningen
Tel. +31.8370.75846/75848
Fax +31.8370.23110
Email: a.gorissen@ab.agro.nl


Verberne, E.L.J., J. Hassink, P. de Willigen, J.J.R. Groot & J.A. van Veen


MOSOM is a mathematical model that was developed to describe carbon (C) and nitrogen (N) cycling in different types of soil, e.g. clay and sandy soils. Transformation rates were described by first-order kinetics. Soil organic matter is divided into four fractions (including microbial biomass pool) and three fractions of residues. The fraction of active soil organic matter was assumed to be affected by the extent of physical protection within the soil, so was the soil microbial biomass. The extent of protection influenced the steady state level of the model, and, hence, the mineralisation rates. The mineralisation rate in fine-textured soils is lower than in coarse-textured soils; in fine-textured soils a larger proportion of the soil organic matter may be physically protected. The availability of organic materials as a substrate for microorganisms is not only determined by their chemical composition, but also by their spatial distribution in the soil. In future research, attention will be paid to the effects of soil structure and soil texture and to the spatial distribution of organic materials and their decomposers. Author of the abstract:
CAMASE Register of Agro-ecosystems Models

Parentage: The models of Van Veen: Veen, J.A. van & E.A. Paul, 1981. Organic carbon dynamics in grassland soils. 1. Background information and computer simulation. Canadian Journal of Soil Science 61: 185-201 Veen, J.A. van, J.N. Ladd & M.J. Frissel, 1984. Modelling C and N turnover through the microbial biomass in soil. Plant and Soil 76: 257-274 Veen, J.A. van, J.N. Ladd & M. Amato, 1985. Turnover of carbon and nitrogen through the microbial biomass in a sandy loam and a clay soil incubated with [14C(4)] glucose and [15N](NH4)SO4 under different moisture regimes. Soil Biology and Biochemistry 17: 747-756

II. Technical Information

II.1 Executables:

Operating System(s): DOS, coprocessor required

II.2 Source-code:

Programming Language(s): FORTRAN

II.3 Manuals:

II.4 Data:

III. Mathematical Information

III.1 Mathematics

III.2 Quantities

Rate variables: (Substrate) decomposition, respiration, nitrogen release, growth of microbialbiomass, net mineralization, (daily) residue input, rate of change in the amount of carbon inmicrobial biomass (nonprotected, protected, stabilized soil organic matter), microbial biomassformed.

State variables: Decomposable material (carbohydrates, proteins), structural material(cellulose, hemicellulose), resistant material (lignified structural material), microbial biomass(protected and nonprotected), protected soil organic matter, nonprotected soil organic matter,stabilized soil organic matter.

Moisture and oxygen status, carbon dioxide pressure, aeration, pH, temperature, soil

III.2.1 Input

Moisture and oxygen status, carbon dioxide pressure, aeration, pH, temperature, soiltype, organic material, agricultural practices, C/N ratio, fraction of decomposable, structural andresistant material, microbial biomass. (Daily) net mineralization of different soils.

III.2.2 Output

(Daily) net mineralization of different soils.

Time interval of simulation: 1 day.

Basic spatial unit: Field.

IV. References

Verberne, E.L.J., J. Hassink, P. de Willigen, J.J.R. Groot & J.A. van Veen., 1990.
Modelling organic matter dynamics in different soils.
Netherlands Journal of Agricultural Science 38 (1990): 221-238

V. Further information in the World-Wide-Web

VI. Additional remarks

Last review of this document by: > T. Gabele: 12. 08. 1997 -
Status of the document:
last modified by Joachim Benz Mon Jul 2 18:31:37 CEST 2007

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