TAILIEUCHUNG - Báo cáo lâm nghiệp: " Crown architecture and leaf habit are associated with intrinsically different light-harvesting efficiencies in Quercus seedlings from contrasting environments"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: Crown architecture and leaf habit are associated with intrinsically different light-harvesting efficiencies in Quercus seedlings from contrasting environments. | Ann. For. Sci. 63 2006 511-518 INRA EDP Sciences 2006 DOI forest 2006033 511 Original article Crown architecture and leaf habit are associated with intrinsically different light-harvesting efficiencies in Quercus seedlings from contrasting environments Jordan ESTESO-MARTÍNEZa Fernando Valladares0 Jesus Julio CAMAREROa Eustaquio GlL-PELEGRÍNa a Unidad de Recursos Forestales Centro de Investigation y Tecnología Agroalimentaria Gobierno de Aragón Apdo. 727 50080 Zaragoza Spain b Centro de Ciencias Medioambientales CSIC Serrano 115 28006 Madrid Spain Received 2 November 2005 accepted 13 December 2005 Abstract - Crown architecture and light-harvesting efficiency Ea were compared in seedlings of eight Quercus species from contrasting environments. Several morphological variables were measured after one year of growth under the same environmental conditions. Ea was estimated with the 3-D model Y-plant. The species were classified in four groups according to their Ea Q. rubra-Q. alba Q. faginea-Q. pyrenaica Q. robur-Q. ilex-Q. coccifera Q. suber. Principal component analysis revealed that the constraining morphological variables for maximizing Ea were the total number of leaves and the variability of internode length. Two contrasting growth models were associated with distinct environments and significantly different Ea evergreen Mediterranean species . Q. suber which showed a multilayered crown of many small leaves rendering low Ea versus deciduous non-Mediterranean temperate species . Q. rubra which showed the opposite characteristics. light-harvesting efficiengy Mediterranean Quercus self-shading Y-plant Résumé - Architecture de la couronne et feuillage sont associés intrinsèquement avec differentes efficiences de capture de la lumière chez les semis de chêne en conditions environnementales contrastées. L architecture des couronnes et l efficience de capture de la lumière Ea ont été comparées chez des semis de 8 espèces de chênes dans des environnements .

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