GreenLab Course
Overview
History.
Authors share a long history in plant modelling, from late seventies to nowadays.
Computational models
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Started in the late seventies, the first developments of Ph. de Reffye on Coffea
lead to the definition of a
structural or geometrical plant growth model called AMAP.
This model became popular for various applications included Computer Graphics.
Structural 3D plant simulations
- Left : Benson plotter 4 colors drawing(1984)
Middle: Tektronix 256 colors screen shot on a Coffee Tree branch (1988)
Right: Silicon Graphics simulated Cypress (1990).
In the late eighties, the structure was used as a transport path support to host functional aspects such as leaf evapotranspiration and secondary growth, building a Functional Structural Plant Model (FSPM).
An FSPM implementation: tha Amap Para Software P. de Reffye, F. Blaise, 1993
- Plant structure, leaf evapotranspiration and secondary growth simulation
Those approchaes were computational:
the structure is simulated applying rules of development defined from field observations.
Mathematical models
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The next model generation, developped in cooperation with China, called GreenLab is a
mathematical model.
It differs from computational models from the fact that both development and functional process are described by equations and not strictely resulting from simulation.
The model quantifies therefore the structure (the number of organs, their apparition time ...) without requesting a exhaustive structural implementation.
This plant model is therefore seen as a classical mathematical dynamic model.
Such an approach makes the model be reversable, making parameter identification and optimization more affordable.
In its latest developments GreenLab can afford functional feedback on the structure under various environmental conditions.
Plant structure plasticity due to density simulated by the GreenLab Model
- This example shows three tree growth stages under two different densities.
The underlying concept is the Projection Area, that thresholds branching and axis lengthning in the structure development.
(© Digiplante software, Ecole Centrale of Paris, 2007)
Plant structure plasticity due to environmental conditions simulated by the GreenLab Model
- This example shows three Crysanthemium growth stages under two different light and temperature conditions.
(© GreenScilab software, LIAMA-CASIA, 2007)
Definition
SPM (Structural Plant Model)
Modelling. (abrev.) Stands for "Structural Plant Model", or "Geometrical Plant Model". Qualifies a mathematical or computational model that expresses the plant architecture (the structure) dynamics thru the development. Such a model offers usually a 3D output.Definition
FSPM (Functional Structural Plant Model)
Modelling. (abrev.) Stands for "Functional Structural Plant Model". Qualifies a mathematical or computational model that expresses both the plant architecture (the structure) dynamics thru the development and its production dynamics thru the organ geometrical development.Definition