Fig. 4From: Intra- and interspecific competition differently influence growth and stem quality of young oaks (Quercus robur L. and Quercus petraea (Mattuschka) Liebl.)Comparison of competition indexes of potential future crop trees (target trees) in between inner and outer sections of groups divided in different successional groups (Ninner section = 44, Nouter section = 34; thin bars represent a standard error of mean at 95 % confidence interval)Back to article page