Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: Optimising the management of even-aged Pinus sylvestris L. stands in Galicia, north-western Spain. | Ann. For. Sci. 64 2007 787-798 INRA EDP Sciences 2007 DOI forest 2007059 Available online at Original article Optimising the management of even-aged Pinus sylvestris L. stands in Galicia north-western Spain María Pasalodos-Tato Timo PUKKALA University of Joensuu Faculty of Forestry PO Box 111 80101 Joensuu Finland Received 14 December 2006 accepted 27 March 2007 Abstract - The study developed management instructions for even-aged Pinus sylvestris stands in Galicia north-western Spain . Although these stands are highly productive no silvicultural management schedules have been proposed so far for them on the basis of systematic analyses. This study used data from 2 160 optimisation runs to develop the management instructions. Land expectation value was used as the objective function. Different prices of timber assortments were considered and the discounting rate was varied from to 5 . The method employed to find the optimal management schedules of stands was the combination of a stand simulator and an optimisation algorithm. The simulator uses an earlier growth and yield model for Pinus sylvestris in Galicia to predict the future development of the stand with a given management schedule while the optimisation algorithm seeks the best management schedule among all the possible alternatives. The results show that optimal rotation lengths vary widely between 42 and 170 years high discounting rates and good site quality resulting in the shortest rotations. Four thinnings were found to be suitable for all sites and discounting rates. With discounting rates higher than 1 the commercial thinnings should gradually decrease the stand basal area towards the end of the rotation. growth and yield model optimal management Scots pine simulation Résumé - Optimisation de la gestion des peuplements équiennes de Pinus sylvestris L. en Galice dans le Nord-ouest de l Espagne. Cette étude développe des instructions de gestion pour des peuplements de Pinus
