TAILIEUCHUNG - Báo cáo khoa học: " Seedling bank dynamics in managed holm oak (Quercus ilex) forests"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Seedling bank dynamics in managed holm oak (Quercus ilex) forests. | Ann. For. Sci. 58 2001 843-852 INRA EDP Sciences 2001 843 Original article Seedling bank dynamics in managed holm oak Quercus ilex forests Marc Graciaa b Javier Retanab and Francesc Xavier Picób a Departament de Producciò Vegetal i Ciència Forestal Universitat de Lleida Rovira Roure 177 25006 Lleida Spain b Centre de Recerca Ecològica i Aplicacions Forestals i Unitat d Ecologia Facultat de Ciències Universitat Autònoma de Barcelona 08193 Bellaterra Barcelona Spain Received 28 August 2000 accepted 4 December 2000 Abstract - The present study reports spatiotemporal variations in seedling bank dynamics during a 5-year period in thinned and unthinned holm oak Quercus ilex plots in the Montseny Massif NE Spain . Large spatial and temporal variations in seedling density have been found in the three plots studied while the spatial pattern has shown low temporal fluctuations. However differences in recruitment and survival among thinned and unthinned plots were small but both variables had large between-year variability. The monitoring of seedling growth over time demonstrated that holm oak seedlings hardly grew in height after five years. According to these results holm oak seedlings persisted through time in the understory and remained suppressed while in the shade but did not show any release after thinning. Thus the seedling bank only represents a reserve of small individuals that do not have any evident role in holm oak forest dynamics under the present disturbance management regime. holm oak seedling recruitment growth survival Résumé - Dynamique du banc de plantules dans des taillis coupés et non coupés de chêne vert Quercus ilex . Cette étude analyse les variations spatiales et temporelles de la dynamique du banc de plantules de chêne vert Quercus ilex pendant cinq ans dans des taillis coupés et non coupés dans le massif du Montseny NE Espagne . Nous avons trouvé de grandes variations spatiales et temporelles de la densité de plantules dans les trois taillis .

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