TAILIEUCHUNG - Báo cáo toán học: "Post-fire succession in two Quercus pyrenaica communities with different disturbance histories"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Post-fire succession in two Quercus pyrenaica communities with different disturbance histories. | 441 Ann. For. Sci. 56 1999 441-447 Inra Elsevier Paris Original article Post-fire succession in two Quercus pyrenaica communities with different disturbance histories Leonor Calvo Reyes Tárrega Estanislao de Luis Area de Ecologia Facultad de Biologia Universidad de León 24071 León Spain Received 29 January 1998 accepted 26 October 1998 Abstract - Quercus pyrenaica is a widely distributed oak species in the Iberian Peninsula which has been subjected to drastic disturbances such as fire leading to a significant decrease in its cover. The main objective of this study was to carry out a comparative analysis of the post-fire regeneration of two Quercus pyrenaica ecosystems. Prior to being burned by a wildfire at the end of the summer in 1985 the first ecosystem presented a developed tree layer whereas the second one was in a shrub layer stage. In each ecosystem a permanent plot was established and sampled for a period of 6 years after the disturbance. Colonisation rates of different biological types were estimated as well as the structural parameters defining the community species diversity richness and evenness. These results allowed us to determine a post-fire successional model for these ecosystems. Post-fire species composition of the two sites was similar but abundance of particular species varied as a function of pre-fire abundance. Inra Elsevier Paris. fire shrub forest regeneration secondary succession Resume - Succession végétale après incendie dans deux peuplements de Quercus pyrenaica. Quercus pyrenaíca est une espèce largement répandue dans la Péninsule Ibérique. Cette espèce a été soumise à des perturbations notamment par le feu qui a conduit à un fort recul de sa couverture. Le principal objet de cette étude est de réaliser une analyse comparative de la regeneration après le feu dans deux écosystèmes de Quercuspyrenaica. Dans 1 un des écosystèmes cette espèce présentait avant d etre brũlée par un incendie nature à la fin de l été 1985 un bon développement

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