tailieunhanh - Báo cáo khoa học: "Evolution of the epicormic potential on 17-year-old Quercus petraea trees: first results"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Evolution of the epicormic potential on 17-year-old Quercus petraea trees: first results. | Ann. For. Sci. 58 2001 583-592 INRA EDP Sciences 2001 583 Original article Evolution of the epicormic potential on 17-year-old Quercuspetraea trees first results Florence Fontainea Francis Colinb Pascal Jarretc and Jean-Louis Druelled a Institut National de la Recherche Agronomique de Champenoux INRA Unité de croissance production et qualité du bois 54280 Champenoux France b Office National des Forêts ONF Stir Ouest d Orléans Parc Technologique Orléans-Charbonnière 45760 Boigny-sur-Bionne France c Université de Reims Champagne-Ardenne UFR Sciences Laboratoire de Biologie et Physiologie Végétales Moulin de la Housse BP 1039 51687 Reims Cedex 2 France Abstract - The epicormic potential was represented by the number of visible epicormic buds primary and secondary present at a given time and on a given length of stem. Data were collected from sixty-six 4-year-old annual shoots on 17-year-old Quercuspetraea with 3 stand densities. We estimated the epicormic potential in 1997 and then followed its evolution over the next 2 years. Preliminary results showed that the epicormic potential decreased from 1997 to 1999 independently to the stand density. The loss ofepicormic buds death or development into shoots was not compensated by the production of new epicormic buds. Furthermore we report that the composition of the epicormic potential was unchanged for these 2 years one third were primary epicormic buds and two thirds were secondary epi-cormic buds. Secondary epicormic buds were mainly found as individual and located at the base of branches. No formations of large clusters of epicormic buds were observed. Quercus petraea epicormic potential bud shoot estimation evolution Résumé - Évolution du potentiel épicormique sur des chênes sessiles âgés de 17 ans premiers résultats. Le potentiel épicormique est représenté par le nombre de bourgeons épicormiques visibles primaries et secondaries presents à un moment donné sur une unité de longueur définie. Les données ont été .