Figure 5. Relationship between seedling growth and mycorrhization level.

Overall, total seedling biomass was positively correlated with mycorrhization, measured as the proportion of root length with hyphal structures (A, R² = 0.433, P < 0.001). This was the result of both above- and belowground effects of mycorrhization on plant growth: both shoot (B, R² = 0.213, P < 0.05) and root (C, R² = 0.558, P < 0.001) dry weight increased with increasing mycorrhization. Points are color-coded by treatment as in Figs. 1–3.