tailieunhanh - Báo cáo lâm nghiệp: "Botanical determinants of foliage clumping and light interception in two-year-old coppice poplar canopies: assessment from 3-D plant mock-ups"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: Botanical determinants of foliage clumping and light interception in two-year-old coppice poplar canopies: assessment from 3-D plant mock-ups. | Ann. For. Sci. 64 2007 395-404 INRA EDP Sciences 2007 DOI forest 2007016 Available online at Original article Botanical determinants of foliage clumping and light interception in two-year-old coppice poplar canopies assessment from 3-D plant mock-ups Eric CASELLAa Hervé SlNOQUETb a Forest Research Biometrics Division Farnham GU10 4LH UK b UMR PIAF INRA-Université Blaise Pascal 63100 Clermont-Ferrand France Received 6 July 2006 accepted 7 November 2006 Abstract - Botanical parameters . shoot and branch inclination petiole length leaf phyllotaxy size and shape that influence light interception and foliage clumping in dense two-year-old monoclonal poplar Populus spp. coppice crops were analysed with a three-dimensional simulation model. Crop LAI varied from 1 to 2 for clone Ghoy and from to for clone Trichobel from May to September. Canopies were strongly clumped with a clumping index p about . Canopy light transmittance t varied from in May to in September for clone Ghoy and from to for clone Trichobel and was strongly associated with LAI. The overall effect of a simulated shift in botanical parameters was relatively small and resulted in limited changes in p and t by and respectively. Petiole length had the most notable effect on p and t while the other parameters were less effective. However biomass cost analyses showed that actual petiole length optimised the efficiency of biomass investment into light capture. biometry multi-scale canopy structure seasonal changes sensitivity analysis three-dimensional model Résumé - Determinants botaniques de l agregation du feuillage et de l interception de la lumière pour des taillis de peupliers âgés de deux ans caractérisation à partir de maquettes 3-D. Les paramètres botaniques angle d inclinaison des tiges et des branches longueur des pétioles phyllotaxie foliaire taille et forme des feuilles qui influencent l interception lumineuse et l agrégation .