Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: reproductive material of pedunculate oak (Quercus robur L) and sessile oak (Quercus petraea Matt Liebl) in France: problems and results. | 435s Ann Sci For 1993 50 Suppl 1 435S-438S Elsevier INRA Note Forest reproductive material of pedunculate oak Quercus robur L and sessile oak Quercus petraea Matt Liebl in France problems and results R Fernandez CEMAGREF Genetic Improvement and Forest Nursery Laboratory Domaine des Barres 45290 Nogent-sur-Vernisson France Summary Genetic improvement of indigenous oaks pedunculate and sessile is only at its beginning but a first step has been reached with the implementation of the 1966 EC directive concerning the collection and the marketing of forest reproductive material seed and seedlings . Two difficulties of implementation are analysed specific purity of stands and reproductive material and validity of the regions of provenance. A conclusion is drawn after nearly 20 years of application. Quercus robur Quercus petraea I seed stand I region of provenance I seed I seedling Resume Les matériels forestiers de reproduction de chênes pédonculé et sessile en France difficultes et résultats. L amelioration génétique des chênes indigenes pédonculé et sessile en est à ses debuts mais une premiere étape a été franchie avec la mise en application de la directive CEE de 1966 pour la récolte et la commercialisation des matériels forestiers de reproduction graines et plants 2 difficultes d application sont analysées pureté specifique des peuple-ments et des lots de matériels forestiers de reproduction validité des regions de provenance et un bilan est tiré après presque 20 ans d application de la regiementation. Quercus robur Quercus petraea peuplement porte-graines I region de provenance sentences plants INTRODUCTION In France the genetic improvement of pedunculate and sessile oak is just beginning with particular emphasis on its intraspecific variability. However since 1973 France has been applying an EC directive requiring forest seed collection in 2 types of stands selected stands phenotypic su periority and tested stands superiority for 1 or several traits in comparative
