Fig. 9

Mean basic density at breast height as a function of mean ring width at breast height for each species (red = Abies alba, blue = Picea abies, beige = Pseudotsuga menziesii) from unthinned plots (circles) and heavily thinned plots (triangles). The p values of the slope are indicated on the graph. The stars indicate the r significance: NS, p ≥ 0.05; *, p < 0.05; **, p < 0.01; ***, p < 0.001