1. General Model Information
Name: Exploring the physiology of Plant Communities
Main medium: terrestrial
Main subject: biogeochemistry
Type of model: not specified
Main application: research, education
Keywords: plant physiology, canopy, photosynthesis, light attenuation, transpiration,temperature, growth functions
PO Box 1590
101 Cooks Road
Armindale NSW 2350
Phone: +61 67 712133
Fax: +61 67 712133
PLANTMOD 2.1 is a sophisticated interactive software package with comprehensive
manual for anyone researching or teaching the growth of plants and plant
communities. It is designed to run under Microsoft Windows 3.1 and is easy
to use. Sample sessions are provided for each model to speed the learning
- Light attenuation: See how direct and diffuse components of
irradiance are intercepted and attenuated through the depth of the canopy.
- Photosynthesis: explore the response of single-leaf and plant
communities (canopy) photosynthetic rates to environmental factors including
atmosheric CO2. For daily canopy net photosynthesis, plant photosynthetic
enzyme levels can be prescribed or calculated for optimum balance between
gross photosynthetic inputs and respiratory losses in response to irradiance,
temperature and atmospheric CO2. Direct and diffuse components of irradiance
are included in the models. Also, observe how factors such as canopy nitrogen
and conductance to water vapour adapt to environmental conditions.
- Transpiration: Study both instantaneous and daily transpiration.
Using a basic soil water balance model, observe soil water content and
its effect on transpiration as the soil dries. Choose between, or compare
the Penman-Monteith equation and the Preistley-Taylor equation to predict
canopy transpiration. Incorporate plant physilogical parameters, environmental
inputs and canopy properties. Canopy conductance (related to stomatal conductance)
can be prescribed or calculated from canopy photosynthesis, as predicted
by the model. This allows the user to explore possible changes in transpiration
in response to changing CO2 levels.
- Temperature: Canopy temperature can differ considerably from
air temperature. Observe how this is affected by environmental conditions,
physiological parameters and canopy properties.
- Growth functions: Gain inside and understanding into the behaviour
of commonly used growth functions. Compare different growth functions on
the same graph.
II. Technical Information
Operating System(s): Demo-Software available from the address above single copy: $230 10-pack: $585
III. Mathematical Information
Batchelor, W.D. 1997. Review of PlantMod 2.1, Field Crops Research (to be published).
Thornley, J.H.M. and Johnson, I.R. 1990. Plant and Crop Modelling, Oxford University Press, UK, pp. 669.
Johnson, I.R. 1995. 'Modelling: keeping plant science and agriculture students interested'. Environmetrics, 6, 517-522.
Johnson, I.R., 1995. 'Modelling canopy photosynthesis in response to environmental conditions', Advances in Space Research, 18, No.1/2, 163-166.
Johnson, I.R., Riha, S.J. and Wilks, D.S. 1995. 'Modelling Daily Net Canopy Photosynthesis and its Adaptation to Irradiance and Atmospheric CO2 Concentration', Agricultural Systems, 50, 1-35,
V. Further information in the World-Wide-Web
VI. Additional remarks
Last review of this document by: 10. August 1997
Status of the document:
last modified by
Tobias Gabele Wed Aug 21 21:44:47 CEST 2002