TAILIEUCHUNG - Báo cáo khoa học: "Morphological variability of oak stands (Quercus petraea and Quercus robur) in northern Germany"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Morphological variability of oak stands (Quercus petraea and Quercus robur) in northern Germany. | 228s Ann Sci For 1993 50 Suppl 1 228s-232s Elsevier INRA Original article Morphological variability of oak stands Quercus petraea and Quercus robur in northern Germany G Elsner Niedersăchsische Forstliche Versuchsanstalt Abt c Abteilung Forstpflanzenzuchtung 3513 Staufenberg OT Escherode Germany Summary According to the German law concerning forest reproductive material purity of species is required for the admission of Quercus robur and Q petraea as seed crop stands. A method for species identification was devised by the Lower Saxony Research Institute. It is based on leaf morphology and calculates a discriminant score for every leaf by the means of discriminant analysis in comparison with 2 pure reference stands. In this way the species relationship and the degree of expression of characters are assessed. Leaf samples were collected in 733 oak stands in Lower Saxony and evaluated for every stand. Mixed stands and stands with a high degree of intermediate forms which may have arisen from hybridization occur besides stands of pure species. Quercus robur Quercus petraeal morphological variability discriminant analysis Resume Variabilité morphologique des peuplements de chêne Quercus petraea et Ouer-cus robur en Allemagne du Nord. La loi allemande exige un contrôle de la pureté specifique des chênaies préalable à leur classement en peuplements porte-graines. Dans ce but nous avons mis au point une methode de reconnaissance des chênes sessile et pédonculé basée sur la morphologic foliaire. Cent-cinquante feuilles sont récoltées au sol dans chaque peuplement. Une fonction sta-tistique discriminants a été établie à partir de 2 peuplements purs de reference. L etude de 733 peu-plements de Basse-Saxe montre la presence de 49 de peuplements pédonculés 40 de sessiles et 11 d hybrides. Même les peuplements dominés par une seule espèce possèdent souvent des feuilles de forme intermédiaire. La part respective de 1 hybridation et de la variabilité intra-arbre dans .

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