Figure 4. Test of simple effects of significant interaction terms from two-way ANOVA by pairwise comparison of least square means. Panel (a) is least square mean P50 (\(\pm\)SE) across forest ages for each species. Panel (b) is least square mean P50 (\(\pm\)SE) across chronosequence regions for each forest age. Groups of bars not sharing the same uppercase letters denote significant differences of main effects at α = 0.05. Within groups, bars not sharing the same lowercase letters denote significant differences at α = 0.05.