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Báo cáo lâm nghiệp: "Leaf morphology as species indicator in seedlings of Quercus robur L. and Q. petraea (Matt.) Liebl.: modulation by irradiance and growth flush"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài: Leaf morphology as species indicator in seedlings of Quercus robur L. and Q. petraea (Matt.) Liebl.: modulation by irradiance and growth flush. | 73 Ann. For. Sci. 61 2004 73-80 INRA EDP Sciences 2004 DOI 10.1051 forest 2003086 Original article Leaf morphology as species indicator in seedlings of Quercus robur L. and Q. petraea Matt. Liebl. modulation by irradiance and growth flush Stéphane Ponton Jean-Luc Dupouey Erwin Dreyer Unité Mixte de Recherches INRA-UHP-Nancy Écologie et Écophysiologie Forestières 54280 Champenoux France Received 7 February 2002 accepted 17 February 2003 Abstract - Morphological description of leaves provides the most reliable criteria to discriminate between the two oak species Quercus petraea and Q. robur. However most earlier studies only assessed leaf morphology of adult trees whereas interspecific variations between seedlings were poorly documented. We studied variations of leaf morphology on two-year-old seedlings growing in a common garden experiment and exposed to different irradiance regimes. Morphological measurements were performed on leaves from each growth flush. Large interspecific differences were detected. The discrimination between the two species was slightly better with first flush leaves. Irradiance influenced leaf size but did not affect the characters usually used to discriminate the two species like relative petiole length or angle of auricle at the base of the lamina. A discriminant function based on the two most discriminating traits lamina pilosity density and angle of auricles at the lamina base provided less than 0.5 leaf misclassification. It appeared that contrary to what is generally accepted species recognition of oak seedlings based on leaf morphology is possible. Moreover this is true whatever the irradiance regime and even slightly easier under light shade than in full sun. morphology leaf light flush oak Résumé - La morphologie foliaire comme indicateur specifique chez les semis de Quercus robur L. et Q. petraea Matt. Liebl. variation avec l eclairement et l unite de croissance. La discrimination taxonomique des espèces Quercuspetraea et Q. robur .