1. General Model Information

Name: MOTOTN 1.2

Acronym: MOTOTN

Main medium: terrestrial
Main subject: agriculture
Organization level: ecosystem
Type of model: ordinary differential equations
Main application:
Keywords: grass growth, soil moisture, carbon dynamics, nitrogen dynamics


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



The model comprises four submodels. The first of these is a vegetative grass growth model with responses to light, temperature and nitrogen based on Johnsson & Thornley (1985), the second concerns a soil moisture submodel (Van Keulen & Seligman, 1987), the third is involved with soil organic matter dynamics (Verberne et al., 1990) and the fourth submodel is related to inorganic nitrogen.

Purpose of the model:

Model parentage: -

Source of the AbstractCAMASE Register of Agro-ecosystems Models

II. Technical Information

II.1 Executables:

Operating System(s): IBM compatible PC. Contract necessary: Costs: : None. Comments:

II.2 Source-code:

Programming Language(s): Microsoft FORTRAN-77.

II.3 Manuals:

II.4 Data:

III. Mathematical Information

III.1 Mathematics

III.2 Quantities

Rate variables: Pasture model: Photosynthesis, growth and partitioning, potential nitrogen uptake rate, respiration, fluxes between the age categories, senescing and recycling of carbon and nitrogen. Soil moisture submodel: Infiltration, evaporation, and transpiration. Soil organic matter dynamics submodel: nitrogen and carbon input. Soil inorganic nitrogen submodel: fertilization and atmospheric deposition, nitrogen transport, nitrogen uptake rate.

State variables: Pasture model: structural and substrate dry matter content, carbon and nitrogen concentration, leaf area index, nitrogen demand, dry matter, dry weight. Soil moisture submodel: volumetric water content in soil layer. Soil organic matter dynamics submodel: decomposable material, structural material Soil inorganic nitrogen submodel: soil mineral nitrogen.

III.2.1 Input

Daily weather data (radiation, irradiation, evaporation, minimum and maximum temperature, early morning vapour pressure, mean wind speed, precipitation), nitrogen demand, leaf area index, root length density, nitrogen fertilization, net mineralization rate, latitude, transpiration, N uptake, water uptake, C/N ratio. Input check in model: Yes.

III.2.2 Output

Gross assimilation, carbon yield, total N uptake, nitrogen yield, N mineralization.
Basic spatial unit: Ha.
Time interval of simulation: Day.

IV. References

Verberne, E., 1992. Simulation of the nitrogen and water balance in a system of grassland and soil. DLO-Instituut voor Bodemvruchtbaarheid Nota 258. 56 pp.

V. Further information in the World-Wide-Web

VI. Additional remarks

Parentage: -
Last review of this document by: T. Gabele: Sep 25 1997 -
Status of the document:
last modified by Joachim Benz Mon Jul 2 18:31:37 CEST 2007

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