tailieunhanh - Báo cáo lâm nghiệp: "Fire behaviour and severity in a maritime pine stand under differing fuel conditions"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài: Fire behaviour and severity in a maritime pine stand under differing fuel conditions. | Ann. For. Sci. 61 2004 537-544 INRA EDP Sciences 2004 DOI forest 2004048 537 Original article Fire behaviour and severity in a maritime pine stand under differing fuel conditions Paulo . Fernandes Carlos A. Loureiro Hermínio S. Botelho Centro de Estudos em Gestão de Ecossistemas UTAD Departamento Florestal Univ. Trás-os-Montes e Alto Douro Quinta de Prados 5000-911 Vila Real Portugal Received 25 July 2003 accepted 23 January 2004 Abstract - An experimental fire was conducted in the summer in a 28-year old maritime pine Pinus pinaster plantation in northeastern Portugal. Fuel conditions within the stand were age-dependent and comprised four situations treated with prescribed fire at differing times respectively 2 3 and 13 years before the study and undisturbed where fuel accumulation time equalled stand age. The rate of fire spread did not respond to factors other than wind speed in spite of the fuel-complex diversity. A high-intensity fire involving partially or totally the tree canopy and killing all trees was experienced in the older treatment area and in the untreated part of the stand but the benefits of fuel management were still detectable in the former. Surface fire intensity crown fire potential and fire severity including tree mortality were drastically reduced where prescribed fire had been carried recently. Fuel and fire management implications are discussed. fire behaviour fire severity experimental fire fuel management Pinus pinaster Résumé - Comportement et sévérité d un feu dans un peuplement de pin maritime pour des conditions de vegetation variées. Un feu expérimental a été réalisé pendant l été dans une plantation de pin maritime Pinus pinaster âgé de 28 ans situé au Nord-Est du Portugal. Les conditions du combustible dans le peuplement étaient dépendantes de la période d accumulation avec quatre situations trois traitées avec brulage dirigé en différents moments respectivement 2 3 et 13 ans avant l étude et une jamais traitée où le .