*, P < 0.05; **, P < 0.01; ***,P < 0.001.
† OTU richness of mycorrhizal fungi: AM fungal OTU richness for AM trees, and ECM fungal OTU richness for ECM trees.
Alnus data were not analyzed because its sample size was very small.
Dry weight of Clethra and Betula seedlings were too light to measure.
PC1, nutrient_PC1.
Table 7 Multiple comparisons of the estimates for tree seedling performance concerning the substrates where the relationships with substrates were selected as a factor in the models in Table 6.