Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: " Site quality equations for Pinus sylvestris L. plantations in Galicia (northwestern Spain)" | Ann. For. Sci. 62 2005 143-152 143 INRA EDP Sciences 2005 DOI forest 2005006 Original article Site quality equations for Pinus sylvestris L. plantations in Galicia northwestern Spain Ulises Diéguez-Aranda Juan Gabriel Álvarez González Marcos Barrio Anta Alberto ROJO Alboreca Departamento de Ingeniería Agroforestal Universidad de Santiago de Compostela Escuela Politécnica Superior Campus universitario 27002 Lugo Spain Received 17 May 2004 accepted 18 October 2004 Abstract - Difference equations derived on the basis of the Sloboda and McDill-Amateis differential functions and from the integral form of the Bertalanffy-Richards Korf and Hossfeld growth functions were used to model the dominant height growth of Scots pine Pinus sylvestris L. in Galicia north-western Spain . Data from stem analysis and permanent sample plots were combined and used for fitting. Both numerical and graphical analyses were used to compare alternative models. The cross-validation approach was used to analyse the predictive ability of the models. The algebraic difference form of the differential function proposed by McDill and Amateis resulted in the best compromise between biological and statistical aspects producing the most adequate site curves. It is therefore recommended for height growth prediction and site classification of Scots pine plantations in Galicia. This equation is base-age invariant so any number of points A1 H1 on a specific site curve can be used to make predictions for a given age A2 and the predicted height H2 will always be the same. height growth site classification algebraic difference equation even-aged forest stand Résumé - Equations prédictives de la fertilite des stations pour des plantations de Pinus sylvestris L. en Galice nord-ouest de l Espagne . À partir des équations différentielles de Sloboda et McDill-Amateis ainsi que de la forme intégrale de Bertalanffy-Richards Korf et Hossfeld un modèle a été établi pour caractériser la croissance en hauteur .
