Il s’agit de la première tentative visant à analyser l’atténuation de la lumière propre à chaque espèce en forêt boréale mélangée avec des arbres modélisés en 3D jusqu’au niveau des pousses.
Light attenuation caused by the dense foliage zone in the upper pine canopy could be avoided in dense stands by mixing species with different vertical foliage distributions. The observed differences in light-transmission characteristics of the studied species may influence the development of target crowns in the neighbourhood. Especially in clumped canopy, species-specific shoot-level light simulations enable a more realistic estimation of light transmission compared with simpler calculations based on LAI and Beer–Lambert’s law. Transmission of light per leaf area index (LAI) was nevertheless higher in the pine canopy compared with the birch canopy because of foliage clumping. Light transmission was found to be higher in dense birch-dominated stands compared with dense pine-dominated stands because of the higher total foliage area and the higher location of foliage in the pine canopy. We study species-specific differences in radiation transmission by using the ray-casting method. The models are configurations of real individual Scots pine ( Pinus sylvestris L.) and silver birch ( Betula pendula Roth.) trees grown in mixed-forest stands. This is a first attempt to analyse species-specific light attenuation in mixed boreal forests created by shoot-level 3D tree models.
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