GreenLab Course
Principles
GreenLab positioning
The GreenLab model approach seeks to benefit from the advantages of both process-based and structural models.
Main assumptions
Inspired from Process-based Models
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The models shares the main assumptions related to plant functioning:
* Environmental conditions define the biomass production level
* Biomass production mainly depends on LAI and LUE, transposed from crop to individual plant level.
* The produced biomass is shared among organs in a common pool.
* Biomass production and partitioning are independent processes.
* Biomass partitioning is performed between individual organs in competition for the common pool.
* Organ sinks are proportional.
Inspired from Structural Models
* Organ differentiation is taken into account, using a classification indexed by both the Physiological age and the chronological age.
* Organogenesis is explicit and quantified.
* Plant structure and its topology can be explicit, allowing 3D representations
* Stochastic behaviour can be considered
* Girth growth (secondary growth) can be considered
* The approach shows a generic framework.
Definition
LAI (Leaf Area Index)
Physiology. (abrev.). LAI is a dimensionless quantity that characterizes plant canopies, defined as the one-sided green leaf area per unit ground surface.Definition
LUE (Light Use Efficiency)
Physiology (abrev.). LUE defines the conversion factor between the daily dry biomass production, expressed in gramme per squere meter per day and the absorbed irradiance (PAR) expressed in Mega Joule per square meter per day. Unit: g.MJ-1. See also: PAR, RUEDefinition