tailieunhanh - Báo cáo lâm nghiệp: "Variability in Populus leaf anatomy and morphology in relation to canopy position, biomass production, and varietal taxon"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: Variability in Populus leaf anatomy and morphology in relation to canopy position, biomass production, and varietal taxon. | Ann. For. Sci. 64 2007 521-532 INRA EDP Sciences 2007 DOI forest 2007029 Available online at Original article Variability in Populus leaf anatomy and morphology in relation to canopy position biomass production and varietal taxon Najwa AL AFASa Nicolas MARR0Na b Reinhart CEULEMANSa a University of Antwerp Department of Biology Universiteitsplein 1 2610 Wilrijk Belgium b Present address UMR 1137 INRA-UHP Écologie et écophysiologie forestières 54280 Champenoux France Received 14 November 2006 accepted 29 January 2007 Abstract - Twelve poplar Populus genotypes belonging to different taxa and to the sections Aigeiros and Tacamahaca were studied during the third growing season of the second rotation of a high density coppice culture. With the objective to highlight the relationships between leaf traits biomass production and taxon as well as the influence of canopy position anatomical and morphological leaf characteristics . thickness of epidermis of palisade and spongy parenchyma layers density and length of stomata leaf area specific leaf area SLA and nitrogen concentration were examined for mature leaves from all genotypes and at two canopy positions upper and lower canopy . Above ground biomass production anatomical traits stomatal and morphological leaf characteristics varied significantly among genotypes and between canopy positions. The spongy parenchyma layer was thicker than the palisade parenchyma layer for all genotypes and irrespective of canopy position except for genotypes belonging to the P deltoides X P nigra taxon section Aigeiros . Leaves at the upper canopy position had higher stomatal density and thicker anatomical layers than leaves at the lower canopy position. Leaf area and nitrogen concentration increased from the bottom to the top of the canopy while SLA decreased. Positive correlations between biomass production and abaxial stomatal density as well as between biomass production and nitrogen concentration were .

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