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Influence of stand structure on understory light distribution. Case of a heterogeneous broadleaved forest on limestones.

Abstract : Light models simulate the distribution of understory lighting from a characterisation of crowns geometry. Our goal was to reduce the quantity of data required. We measured the data set necessary to a light model (tRAYci) in a heterogeneous broadleaved stand. We established relationships between the variables characteristic of the crown and the diameter of the trees at 1.30 m. We developed an algorithm taking competition between crowns for space occupation into account, given only the species of the tree, its diameter at a height of 1.30 m and its position. We compared this reconstruction method (anisotropic) to a simpler method (isotropic), considering the simulation quality of the light distribution obtained. Only the anisotropic approach allowed us to obtain an unbiased simulation of light distribution at the level of the plot. We also tested indices based on the spatial distribution of the basal area, which proved incapable of predicting the light distribution in an unbiased way.
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https://pastel.archives-ouvertes.fr/pastel-00001666
Contributor : Ecole Agroparistech <>
Submitted on : Wednesday, March 29, 2006 - 8:00:00 AM
Last modification on : Wednesday, March 29, 2006 - 8:00:00 AM
Long-term archiving on: : Thursday, September 30, 2010 - 7:22:12 PM

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  • HAL Id : pastel-00001666, version 1

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Alexandre Piboule. Influence of stand structure on understory light distribution. Case of a heterogeneous broadleaved forest on limestones.. Life Sciences [q-bio]. ENGREF (AgroParisTech), 2005. English. ⟨pastel-00001666⟩

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