TAILIEUCHUNG - Báo cáo lâm nghiệp: "Links between tree structure and functional leaf traits in the tropical forest tree Dicorynia guianensis Amshoff (Caesalpiniaceae)"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài:"Links between tree structure and functional leaf traits in the tropical forest tree Dicorynia guianensis Amshoff (Caesalpiniaceae)" | Ann. For. Sci. 62 2005 553-564 INRA EDP Sciences 2005 DOI forest 2005048 553 Original article Links between tree structure and functional leaf traits in the tropical forest tree Dicorynia guianensis Amshoff Caesalpiniaceae Jean Christophe ROGGYa Eric NICOLINIb Pascal IMBERTa Yves CARAGLIOb Alexandre BOSCa Patrick HEURETb a UMR CIRAD-ENGREF-INRA Écologie des Forêts de Guyane campus agronomique de Kourou BP 709 97387 Kourou Cedex Guyane íranẹaise France b UMR AMAP TA40 PS2 boulevard de la Lironde 34398 Montpellier Cedex 05 France Received 1st July 2004 accepted 15 February 2005 Abstract - This study looked at the interactive effects of tree architectural stage of development ASD and light availability on different plant traits growth parameters leaf morpho-anatomy and photosynthetic capacities in the tropical species Dicorynia guianensis. A qualitative architectural analysis was used to categorize tree individuals sampled along a natural light gradient. The results show that some traits could have an ASD-dependence at the whole plant and leaf level without control of light. The changes observed relate to vigour thresholds the plant has to reach to shift from one ASD to another . the number of nodes and the internodes length per Growth Unit . Light conditions do not modify these thresholds but may modify the time they are crossed. Tree height was found strongly modulated by light conditions hence at a similar height individuals may belong to different ASD. At the functional level a decrease in Nm and Amaxm was observed with increasing light availability while Na increased and Amaxa remained unaffected. An ASD effect was also observed on Amaxa and LMA but not on Amaxm. These results demonstrated a weak ability of photosynthetic plasticity in response to light conditions and that variations of leaf photosynthetic variables according to ASD can be explained by modifications in leaf nitrogen and LMA. Questions on the reliability of a height-based sampling .

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