tailieunhanh - Báo cáo khoa học: "Variation of growth in Danish provenance trials with oak (Quercus robur L and Quercus petraea Mattuschka Liebl"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Variation of growth in Danish provenance trials with oak (Quercus robur L and Quercus petraea Mattuschka Liebl). | Ann Sci For 1993 50 Suppl 1 203S-207S Elsevier INRA 203s Original article Variation of growth in Danish provenance trials with oak Quercus robur L and Quercus petraea Mattuschka Liebl JS Jensen Danish Forest and Landscape Research Institute Skovbrynet 16 2800 Lyngby Denmark Summary In 1990 an evaluation was made of all 29 Danish provenance trials with oak. For the most part north-European provenances have been used in these trials. The paper presents results from 2 provenance trials with respectively 20 and 25 provenances 25 years of age raised from seed. From these trials it can be seen that the provenances are divided into many distinctive ecotypes and differ with regard to the time of flushing volume yield morphological characteristics etc. High heritability values have been found for straightness tree height and volume yield as well as for flushing epicormics and axis formation. Q roburl Q petraea I provenance I stem form I epicormic shoot Resume Variabilité intraspecifique de la croissance du chêne pédonculé Q roburL et sessile O petraea Matt Liebl au Danemark. Les 29 tests de provenance de chênes installés au Da-nemark ont été étudiés en 1990. Ces tests comprenaient essentiellement des provenances d Europe du Nord. Les résultats présentés ici concernent 2 tests regroupant 20 et 25 provenances et âgés de 25 ans. Ils montrent que les provenances se répartissent en differents ecotypes. Des variations im-portantes ont été observées pour le débourrement la production en volume la forme. Des valours élevées d heritabilite ont été trouvées pour la rectitude du tronc la hauteur le volume le débourre-ment les pousses épicormiques et la formation de la tige principale. Q robur Q petraea provenance forme du tronc pousse épicormique INTRODUCTION Due to a lack of sufficient seed sources in Denmark there has always been a fairly large importation of acorns from different countries. Although the foreign provenan ces often showed good form and production qualities they .