Plant eco-physiology for crop models

This section presents an overview of plant physiology concepts involved in crop modelling. Thermal Time normalization - The thermal time normalization allows comparing plant growth on both organogenesis (organ numbering) and development (organ size) aspects. Light interception: PAR,LAI and Beer-Lambert Law - Only part of the light energy is used in plant crops. A limited fraction of the light spectrum is absorbed by the leaves; this part is constrained by the upper leaf area and decreases in the canopy. Photosynthesis. Light Use Efficiency - Photosynthesis process converts absorbed light energy to biomass with a ratio proportional to the Light Use Efficiency. Density effect - At the individual plant level,density limits light absorption capabilities,and thus dynamically limits the biomass production. Biomass common pool - Biomass produced by the source Organs (leaves) builds a common storage pool,to be share among all competing growing organs. Organ competition - Sinks Organs growing compete for biomass allocation. They are sinks. Process Bases Models - Process Based Models or Crop models aim to model and simulate the biomass production.

Disciplines : Botanique : généralités,Systèmes physiologiques des plantes
Mots-clés : plant,eco-physiology,thermal time,density,sources,sinks,biomass production,LAI,biomass partitioning,Process based models,plane,éco-physiologie,temps thermique,densité,sources,puits,production de biomasse,LAI,allocation de biomasse,modèle de culture
Type de document : texte,ressource interactive,image fixe
Type de ressource : lecture,exercise,questionnaire
Niveau : licence,master
Publics visés : learner,teacher
Proposition d'utilisation : Licence and Master cursus
Auteurs ou éditeurs : Ep Heuveulink,BaoGui Zhang,Philippe De Reffye,Marc Jaeger,Hatem Krit,Marc Jaeger,UVED