Đang chuẩn bị liên kết để tải về tài liệu:
Báo cáo khoa học: " Genetic improvement of oak KC Steiner in North America School of Forest Resources,Pennsylvania State University, University Park"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Genetic improvement of oak KC Steiner in North America School of Forest Resources,Pennsylvania State University, University Park,. | Ann Sci For 1993 50 Suppl 1 359s-367s Elsevier INRA 359s Review article Genetic improvement of oaks in North America KC Steiner School of Forest Resources Pennsylvania state University University Park PA 16802 USA Summary The resource and silvicultural contexts of oak tree improvement in North America are described briefly and the methods species locations and objectives of specific projects are summarized. Brief descriptions are provided of two projects that differ markedly in scope. Past experience suggests that few of the existing projects will ultimately be successful unless project leaders take deliberate steps to transfer genetic gains from seed orchard to operational plantations. Ouercus genetic improvement North america review Resume Amelioration génétique des espèces nord-américaines. Le contexte de la ressource et de la sylviculture des chênes est tout d abord brièvement décrit dans le cadre des programmes d amelioration de ces espèces. Une revue des espèces concernées des regions OÙ ces programmes sont menés des objectifs affiches et des methodes utilisées est ensuite faite. Deux programmes dont les ambitions sont differentes sont plus particulièrement décrits. Uexpérience pas-sée montre que peu de projets seront couronnés de succès à moins que leurs responsables ne prennent des initiatives fermes pour transferer les gains génétiques obtenus dans les vergers à graines vers le reboisement. Quercus amelioration génétique Amérique du Nord synthèse INTRODUCTION There are many oak improvement programs in North America and they are directed at a rather large number of species. Naturally the methods and objectives of these programs differ considerably and a comprehensive coverage of them would involve excessive detail. Instead this paper gives a general overview of oak improvement with in addition some attention to peripheral matters that I think are important to those engaged in this activity in North America. The information regarding specific projects is .