Inter-regional variability in site index models for even-aged stands of stone pine (Pinus pinea L.) in Spain

Data from 96 stem analysis and 37 permanent plots in even-aged stands of stone pine (Pinus pinea L.) in four regions of Spain (Central Range, Northern Plateau, West Andalusia and Catalonia) are used to develop a dominant height growth model for each region. These models are compared to detect similarities or differences in height growth patterns between regions, which will justify the need to build more regional site index curves for the species in Spain. Comparing these models involves homogeneity tests of parameters and a statistical analysis of the bias.