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Understanding the effects of exogenous factors on tree development is of major importance in the current context of global change. Assessing the structure development of trees is difficult given that they are large and complex organisms with lifespan of several decades. We used a retrospective analysis to derive the ontogenetic trends in silver fir(More)
Most classic ecophysiological models rely on crude representations of canopies as stacks of vegetation layers. Therefore, their use in complex canopies implies complicated adaptations as well as simplifying assumptions that are difficult to validate. Alternatively, the ARCHIMED simulation platform uses 3D virtual stands as a support for numerical(More)
Very high spatial resolution (VHSR) satellite images provide interesting information for parameterizing tree-scale forest process-based models, and in particular their light absorption submodels, which is at the basis of photosynthesis calculation. Such tree-scale models require a large amount of field measurements to describe the forest ecosystems, i.e.(More)
Modelling the phenotypic variability of rosette architecture of Arabidopsis thaliana in several ecotypes and mutants in response to incident radiation The amount of absorbed radiation has a large influence on development, expansion and architecture of plants. We propose a structural-functional approach to analyse and model the phenotypic variability of(More)
This paper gives an overview of French studies realized in the frame of the CNES (French Space Agency) working group on spaceborne lidar missions. These studies include (1) the development of forest scenery and radiative transfer models for the simulation of lidar waveforms under forest cover, (2) preliminary instrumental studies to ensure the feasibility(More)
Archimed is a simulation software being currently wrapped within the Alea computer platform. The Archimed purpose is first to simulate radiative transfers within 3D virtual stands composed of " architectural " plant mock-ups or geometrical crown shapes. Two models are implemented, using respectively the ray-tracing and the Z-buffer methods. The ray-tracing(More)
Light interception is a major contributor to biomass accumulation of crops. Beer's law has been extensively used to estimate the amount of light intercepted by a plant at canopy level. This method, based on the use of the leaf area index (LAI), is designed for well-developed crops where the canopy is assumed to be a turbid medium (Jones, 1992). However this(More)
The purpose of this investigation was to develop a method for building simplified geometrical representations (GM) of cotton plants that could be used to simulate plant light interception at low planting densities. Individual plants were observed infield trials throughout their growing period and their 3D architecture (AM) was reproduced at all growth(More)
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