1. General Model Information
Name: Ecophysiological Whole-tree Growth Process Model for Poplar
Main medium: air+terrestrial
Main subject: biogeochemistry
Type of model: not specified
Keywords: forest, poplar, growth projections, solar radiation, temperature, ozone, CO2 concentration
Natural Resources Research Institute
University of Minnesota-Duluth
5013 Miller Trunk
Fax : 218 720- 4219
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
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
Operating System(s): DOS
Programming Language(s): BASIC, C++ and Prolog
III. Mathematical Information
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