1. General Model Information

Name: HEDGEROW 1.0 - Hedgerow canopy gross photosynthesis.


Main medium: terrestrial
Main subject: agriculture
Organization level: ecosystem, biocoenosis, population
Type of model: ordinary differential equations
Main application:
Keywords: photosynthesis, intercropping, hedgerows, light interception, heterogenous canopies


Ir. J.G. Gijzen.
Wageningen Agricultural University, Dept. Horticulture, Haagsteeg 3, 6708 PM Wagen ingen, THE NETHERLANDS.
Phone: +31.317.482397
Fax: +31.317.484709
email: hans.gijzen@users.tbpt.wau.nl



The model calculates gross photosynthesis of a hedgerow crop (i.e. the rows were assumed to have a rectangular transsection and to be infinitely long). Diffuse and direct light distribution and absorption are calculated taking account of scattering and reflection. Leaf photosynthesis is calculated from absorbed light and integrated over the row.

Purpose of the model:

Model parentage: -

Source of the AbstractCAMASE Register of Agro-ecosystems Models

II. Technical Information

II.1 Executables:

Operating System(s): Any computer. 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: Leaf gross photosynthesis, photosynthetic active radiation absorption, crop gross photosynthesis.

State variables: None.

III.2.1 Input

Leaf photosynthesis parameters, leaf area index, row height, path width, latitude, day of year, hour of day, fraction diffuse photosynthetic active radiation. Input check in model: No.

III.2.2 Output

Instantaneous crop gross photosynthesis, canopy photosynthetic active radiation absorption.
Basic spatial unit: m2.
Time interval of simulation: Instantaneous.

IV. References

Gijzen, H. & J. Goudriaan, 1989. A flexible and explanatory model of light distribution and photosynthesis in row crops. Agricultural and Forest Meteorology 48: 1-20

V. Further information in the World-Wide-Web

VI. Additional remarks

Parentage: -
Last review of this document by: T. Gabele: Tue Sep 23 1997
Status of the document:
last modified by Joachim Benz Mon Jul 2 18:31:37 CEST 2007

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