Fig. 2
Species performances under the different thinning treatments: uncut (black bars, 32 m2/ha), moderate thinning (gray bars, 19 m2/ha at St Mitre and 12 m2/ha at Ayora) and heavy thinning (white bars, 10 m2/ha at St Mitre and 7.5 m2/ha at Ayora). Survival rates are shown at 3 years after seedling introduction, values are means of 4 or 3 plots per treatment, and different letters indicate differences in time-course of survival over the 3 years, as evaluated by Kaplan-Meier functions followed by a log-rank test. Relative growth rates (RGR) were calculated for 10–90 3-year-old seedlings per treatment. Negative RGR is explained by above-ground biomass destruction followed by resprouting. Error bars represent the standard error of the mean. Different letters indicate differences between treatments for a given species according to Tukey post hoc tests. Differences were considered significant at p < 0.05. See Table 2 for species codes