Dominant height growth equations including site attributes in the generalized algebraic difference approach

We present a new dynamic dominant height growth model based on Cieszewski's generalized algebraic difference approach (GADA) advanced dynamic site equation strengthened by the use of explicit climate and soil variables (i.e., H = f([H.sub.0],[T.sub.0], T site conditions)). The results suggest that the inclusion of climatic variables would improve the applicability of the inter-regional model in regions in which climate and soil type lead to intea-regional variability. The new model reduces the bias present in a previous dynamic model that did not include climatic attributes and improves the model efficiency across the different age classes. Climate has a multiplicative effect on dominant tree growth in the early development stages ( Nous presentons ici un nouveau modele dynamique de croissance en hauteur dominante fonde sur l'equation de la methode de la difference algebrique generalise (GADA) de l'indice de qualite de station de Cieszewski renforcee par l'utilisation des variables explicites du climat et du sol, c.-a-d. H = f([H.sub.0], [T.sub.0], T, tat du site). Les resultats indiquent que l'inclusion des variables climatiques permettrait d'ameliorer l'applicabilite du modele interrgional dans les regions ou le climat et le type de sol sont a l'origine de la variabilite intrargionale. Le nouveau modele permet de rduire le biais present dans un modele dynamique precedent qui n'incluait pas les caracteristiques climatiques et ameliore l'efficacite de ce modele pour l'ensemble des classes d'age. Le climat exerce un effet multiplicateur sur la croissance des arbres dominants durant les premiers stades de developpement ( [Traduit par la Redaction]
Introduction Mediterranean maritime pine (MMP; Pinus pinaster Ait.) is widely distributed in the Mediterranean basin, occupying approximately 4 x [10.sup.6] ha (Ribeiro et al. 2001). The species grows in a [...]