Fig. 8From: Tree potential growth varies more than competition among spontaneously established forest stands of pedunculate oak (Quercus robur)Relationship between forest stand structure variables (see A Table 3) and forest stand-level medians of the parameters (see Table 1 for parameter definition) of the asymmetric size-dependent competition model. Lines show average regressions (using the mean of the intercepts and slopes estimated with the bootstrap linear regressions). NND denotes the nearest neighbour distanceBack to article page