TAILIEUCHUNG - Báo cáo lâm nghiệp: "Influence of light and competition on crown and shoot morphological parameters of Norway spruce and silver fir saplings"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài:"Influence of light and competition on crown and shoot morphological parameters of Norway spruce and silver fir saplings" | Ann. For. Sci. 62 2005 269-274 INRA EDP Sciences 2005 DOI forest 2005019 269 Original article Influence of light and competition on crown and shoot morphological parameters of Norway spruce and silver fir saplings Giacomo GRASSia b Raffaello Gianninic a Dip. Colture Arboree University of Bologna Via Fanin 46 40127 Bologna Italy b Present address University of Padua Dip. Territorio e Sistemi Agro-Forestali 35020 Legnaro PD Italy c Dip. Scienze e Tecnologie Ambientali Forestali University of Florence Italy Received 20 October 2003 accepted 17 December 2004 Abstract - The effects of a natural gradient of light and competition on crown shoot and needle morphology of naturally regenerated Norway spruce Picea abies and silver fir Abies alba saplings m tall were analyzed in a uneven-aged managed stand in Comelico eastern Italian Alps . The results indicate that i both crown shoot and needle morphology are strongly affected by light but in the examined conditions relative irradiance ranging from 2 to 32 no significant effect of competition was observed ii the ecological differences between Norway spruce and silver fir saplings cannot be mainly attributable to differences in crown morphological traits and iii the apical dominance ratio . the length of the apical leader divided by the mean length of the lateral shoots at the last node is a relatively good and simple indicator of the light conditions in which saplings are growing. These informations may be useful in order to promote and assure effectively natural regeneration. light competition growth crown morphology shoot morphology Résumé - Influence de la lumière et de la competition sur les paramètres morphologiques de la couronne et de la pousse chez des plants d epicea et de sapin pectiné. Les effets d un gradient naturel de lumière et de competition sur la couronne la pousse et la morphologie des aiguilles de plants 0 8 à 2 2 m de hauteur d epicea Picea abies et de sapin pectiné Apies alba ont été .

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