tailieunhanh - Báo cáo lâm nghiệp: "Predicting stand damage and tree survival in burned forests in Catalonia (North-East Spain)"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: Predicting stand damage and tree survival in burned forests in Catalonia (North-East Spain). | Ann. For. Sci. 64 2007 733-742 INRA EDP Sciences 2007 DOI forest 2007053 Available online at Original article Predicting stand damage and tree survival in burned forests in Catalonia North-East Spain José Ramón GONZALEZa Antoni TRASOBARESb Marc PALAHÍa Timo PUKKALAb a Centre Tecnològic Forestal de Catalunya. Pujada del seminari s n 25280 Solsona Spain b ForEcoTechnologies Av. Diagonal 416 Estudio 2 Barcelona 08037 Spain Received 4 October 2006 accepted 13 March 2007 Abstract - The study developed models for predicting the post-fire tree survival in Catalonia. The models are appropriate for forest planning purposes. Two types of models were developed a stand-level model to predict the degree of damage caused by a forest fire and tree-level models to predict the probability of a tree to survive a forest fire. The models were based on forest inventory and fire data. The inventory data on forest stands were obtained from the second 1989-1990 and third 2000-2001 Spanish national forest inventories and the fire data consisted of the perimeters of forest fires larger than 20 ha that occurred in Catalonia between the 2nd and 3rd measurement of the inventory plots. The models were based on easily measurable forest characteristics and they permit the forest manager to predict the effect of stand structure and species composition on the expected damage. According to the stand level fire damage model the relative damage decreases when the stand basal area or mean tree diameter increases. Conversely the relative stand damage increases when there is a large variation in tree size when the stand is located on a steep slope and when it is dominated by pine. According to the tree level survival models trees in stands with a high basal area a large mean tree size and a small variability in tree diameters have a high survival probability. Large trees in dominant positions have the highest probability of surviving a fire. Another result of the study is the