1. General Model Information

Name: Fagus sylvatica model

Acronym: FSYL_MOD

Main medium: terrestrail
Main subject: biogeochemistry
Organization level: Populations
Type of model: compartment model, individual-based
Main application:
Keywords: photosynthesis, carbon budget, water budget, deciduous forest, Bossel function


Dr. Dirk Gansert
Univ. Goettingen
Untere Karspuele 2
37073 Goettingen, Germany
Phone: +49-551-395724
Fax : +49-551-395701


W. Stickan
Dr. Dirk Gansert
G. Neemann
U. Rees


contents of the model
FSYL_MOD simulates perennial courses of carbon and water budgets of beech saplings from a temperate deciduous forest. The output gives daily totals of C-input, dark respiration of leaves, respiration of stem, main and lateral roots net-C-gain and transpiration based on m^2 leaf area or plant biomass respectively. Daily relative growth rate (%) and transpiration coefficient based on dry weight production is also given (g H_2Og^{-1}).
principles of the model
The model is based on field measurements of daily courses of assimilation, transpiration and respiration. Biometrical data were derived as mean values of 6 harvested sample trees in the understorey and a natural gap: total biomass, leaf area, spec. leaf weight dry mass of stem lateral shoots and of roots with regard to different diameter classes. Based on site-specific meteorological measurements correlations were calculated between these data and those of the nearest station of the German weather service (DWD). Assimilation was calculated by an empirical exponential function; respiration was calculated by applying the Bossel-function.

II. Technical Information

II.1 Executables:

Operating System(s): MS-DOS Type of computer: 386 PC RAM required: 2 MB Disc space: 1.4 MB

II.2 Source-code:

Programming Language(s): Q-BASIC

II.3 Manuals:

II.4 Data:

III. Mathematical Information

III.1 Mathematics

III.2 Quantities

III.2.1 Input

III.2.2 Output

IV. References

V. Further information in the World-Wide-Web

VI. Additional remarks

Additional information
Last review of this document by: T. Gabele: 10.July 1997 -
Status of the document:
last modified by Tobias Gabele Wed Aug 21 21:44:43 CEST 2002

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