1. General Model Information

Name: DYnamics of Nutrients And Moisture In Tropical Ecosystems


Main medium: terrestrial
Main subject: biogeochemistry
Organization level: ecosystem
Type of model: compartment model
Main application:
Keywords: plant nutrition, soil science, nutrient cycling, forestry


to order the model and publications:
The Tropenbos Foundation
Lawickse Allee
P.O.Box 232
6700 AE Wageningen
The Netherlands

for scientific consultation:
Dr.ir. B.H. Janssen
Wageningen Agricultural University
Dept. Soil Science and Plant Nutrition
P.O. Box 8005
6700 EC Wageningen
The Netherlands
Phone: +31.8370.8384
Fax : +31.8370.83766
email: bert.janssen@bodvru@benp.wau

about programming:
Drs. K.G. Eikelboom
email: s.visser@pobox.ruu.nl



The model simulates nutrient and moisture cycling in tropical forests. The rational behind the model is that the availability of nutrients (N, P, K) and water is limiting the growth. The model keeps track of the vegetation, litter pools, organic pools and soil solution. The moisture cycling submodel is an adapted box model derived from ILWAS. The nutrient uptake and growth by the vegetation is calculated as a function of the quantities of available nutrients in the soil solution and nutrient concentrations in the vegetation compartments (leaf, wood, fine roots and coarse roots). Litter fall is simulated as a first order process dependent on nutrient concentration or the age of the vegetation. Dissimilation and transfer of organic pools are calculated using relative decomposition rates that decrease in course of time. The objective purpose of the model is to study the effects of soil fertility, nutrient cycling, and climate variables on the growth of forest vegetation and secondary fallow vegetation. The ultimate goal is to predict the effects of different management scenarios in forested areas.

Model Parentage: NUTCYC, MINIP and ILWAS.

Author of the abstract:
CAMASE Register of Agro-ecosystems Models

II. Technical Information

II.1 Executables:

Operating System(s): 386DX IBM compatibleUser contract mandatory: Info at The Tropenbos Foundation. Costs: Info at The Tropenbos Foundation.

II.2 Source-code:

Programming Language(s): Turbo Pascal 6.0 from Borland (inclusive Turbo vision)

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

Noij, I.G.A.M., B.H. Janssen, L.G. Wesselink & J.J.M. van Grinsven, 1993. Modeling Nutrient and MoistureCycling in Tropical Forests. Tropenbos Series 4, The Tropenbos Foundation, Wageningen. 195 pp.

Eikelboom, K.G. & B.H. Janssen. The program of the model. Dynamite: DYnamics of Nutrients And Moisture In Tropical Ecosystems. Tropenbos document (in press.).

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

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