Fig. 8

Observed and predicted basal area increment (BAI) for Fagus sylvatica, Quercus petraea, and Quercus pyrenaica (a) and BAI prediction series for the variation, within the studied period, of tree diameter (DBH), competition (total BA and the fraction of it belonging to each of the species), and climatic effects separately, keeping the rest of the fixed effects constant (mean value of the period) (b). In the (b) plots, linear regressions were fitted to BAI predictions for the variation in climate variables (keeping DBH and BA constant) to show the long-term BAI trend but not considering annual variability