1. General Model Information

Name: Ecophysiological Whole-tree Growth Process Model for Poplar

Acronym: ECOPHYS

Main medium: air+terrestrial
Main subject: biogeochemistry
Organization level:
Type of model: not specified
Main application:
Keywords: forest, poplar, growth projections, solar radiation, temperature, ozone, CO2 concentration


George Host
Natural Resources Research Institute
University of Minnesota-Duluth
5013 Miller Trunk
Highway Duluth
MN 55811
Fax : 218 720- 4219
email: ghost@sage.nrri.umn.edu



ECOPHYS (Ecophysiological Whole-tree Growth Process Model for Poplar) is a heuristic, process, simulation model (Host et al., 1990). It predicts the height and diameter growth of trees based on a set of environmental parameters and genetic traits. It was developed to understand the effects of selected genetic strains of trees on tree growth.

The model uses a three-dimensional analytical approach to simulate canopy architecture. Tree physiology is modeled as it responds to changes in sun intensity due to the tree leaf's position in the canopy and the direction of the sun rays' angle of incidence. The model is driven by hourly light and temperature, hourly ozone and CO2 concentrations. Several species-specific parameters are required as inputs as well. The model executes over an hourly time step for seasonal ranges.

Author of the abstract:


II. Technical Information

II.1 Executables:

Operating System(s): DOS

II.2 Source-code:

Programming Language(s): BASIC, C++ and Prolog

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

Host, G.E., M. Rausher, J.G., Isebrands, D.I., Dickman, R.E., Dickson, T.R., Crow and D.A. Michael. 1990.The microcomputer scientific software series #6: the ECOPHYSuser's manual. USDA General Service Gen. Tech. Report, NC-131.

Rauscher, H.M., J.G.Isebrands, G.E. Host, R.E., Dickson, D.I., Dickmann, T.R., Crow, and D.A. Michael. 1990.ECOPHYS: an ecophysical growth process model of poplar. Tree Physiology. 7:255- 281.

V. Further information in the World-Wide-Web

VI. Additional remarks

Global change implications: This model could be used in global changeresearch to examine the effects of elevated CO2 and changes in ozone on forest growth. It can also be used to examine how changes in geneticcomposition of trees may mitigate anticipated climate change.

Last review of this document by: T. GabeleNov 21th 1997
Status of the document:
last modified by Tobias Gabele Wed Aug 21 21:44:42 CEST 2002

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