1. General Model Information

Name: DanStress

Acronym: DANSTRESS


Main medium: terrestrial
Main subject: hydrology, agriculture
Organization level: population
Type of model: ordinary differential equations
Main application:
Keywords: Evapotranspiration, transpiration, water stress, monteith equations, leaf water potential, stomatal response

Contact:

Mr. Chr.R. Jensen.
The Royal Veterinary & Agricultural University, Department of Agricultural Sciences; Soil, Water and Plant Nutrition, 10, Agrovej, DK-2630 Taastrup, DENMARK.
Phone: +45.35.28 34 77 / 35.28 33 96
Fax: +45.35.28 21 75 / 35.28 35 74
email:

Author(s):

Abstract:

DanStress integrates effects of soil crop and climatic conditions. Crop transpiration is calculated by Monteith's combination equation for vapour flow. Crop conductance is scaled up from an empirical stomatal conductance model. Transpirational water loss originates from root water uptake and changes in crop water storage. Pressure volume curves of leaves describe crop water storage and crop water relations. The root zone is separated into layers. Root water uptake is calculated by a single root model combined with a root contact model.

Source of the AbstractCAMASE Register of Agro-ecosystems Models


II. Technical Information

II.1 Executables:

Operating System(s): PC IBM compatible min. 386. Contract necessary: Costs: : None. Comments:

II.2 Source-code:

Programming Language(s): Turbo Pascal version 5.0, Borland.

II.3 Manuals:



II.4 Data:



III. Mathematical Information


III.1 Mathematics


III.2 Quantities

Rate variables: Root hydraulic conductivity, stomatal conductivity, drainage, capillary rise.

State variables: Crop water content, soil water content, structural leaf area, root density.

III.2.1 Input

Rain, humidity, light, wind speed, temperature, pressure volume curves, crop conductance models.

III.2.2 Output

Plant water status RWC, transpiration, crop conductance, soil water content.
Basic spatial unit: Field based.
Time interval of simulation: 10 minutes.

IV. References


Jensen, C.R., H. Svendsen, M.N. Andersen & R. Losch, 1993. Use of the root contact concept, an empirical leaf conductance model and pressure-volume curves in simulating crop water relations. Plant and Soil 149: 1-26



V. Further information in the World-Wide-Web


VI. Additional remarks

Parentage:
Last review of this document by: T. Gabele: 22. 11. 1997
Status of the document:
last modified by Joachim Benz Mon Jul 2 18:31:37 CEST 2007

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