Figure 3

The shifts of standardized effect size of phylogenetic diversity (ses.PD) with the increase of N deposition rate (0, 1.75, 5.25, 10.5, 17.5, 28 g N m ⁻² yr⁻¹). The segmented linear regressions were fitted according to two N ranges, 0–10.5 and 10.5–28 g N m⁻² yr⁻¹. The corresponding statistics were provided. Grey bands represented the bootstrapped 95% confidence intervals. There were 36 samples in total, and 6 samples at each N level. We used semi-transparent black points instead of the pure black points to avoid the confusion about the number of samples.