Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Taxonomical impact of morphological variation in Quercus robur and Q petraea: a contribution to the hybrid controversy. | 107s Ann Sci For 1993 50 Suppl 1 107S-113s Elsevier INRA Original article Taxonomical impact of morphological variation in Quercus robur and Q petraea a contribution to the hybrid controversy G Aas Chair of Forest Botany University of Munich Hohenbachernstr 22 8050 Freising 12 Germany Summary Numeric - taxonomical analysis of the complex Quercus robur-Q petraea showed that variability within each of the 2 species is so wide that none of the features considered is suitable for clear distinction. By using multivariate statistical analysis it was possible to differentiate 2 distinct groups and thus to locate intermediate individuals. However designating such morphologically intermediate individuals as hybrids remains questionable because it is not possible to find the exact limits of each group. For practical reasons such limits have often been defined more or less arbitrarily without taking into account the wide variability of the 2 species. This explains the widely accepted view that they hybridize frequently a view that cannot be supported by the findings of this project. Quercus robur Quercus petraea taxonomy morphological variation hybridization Resume Impact taxonomique de la variation morphologique Chez Quercus robur et Q pe-traea une contribution à la controverse sur les hybrides. L analyse taxonomique numéríque du complexe Quercus robur-Q petraea montre que la variabilité à 1 intérieur de chacune des 2 espèces est si grande qu aucune des caractéristiques considerées ne permet une Claire demarcation. En utili-sant les statistiques multivariées II a été possible de differencier 2 groupes distincts et ainsi de loca-liser les individus intermédiaires. Pourtant designer de tels individus morphologiquement intermédi-aires comme hybrides reste contestable parce qu il n est pas possible de deflnir une limlte exacte pour chaque groupe. De telles limites ont souvent été definies pour des raisons pratiques de manière plus OU moins arbitraire. Elies ne tenaient pas .
