Mycorrhizal composition and species dominance mediate forest plant richness and abundance responses to environmental gradients

Species dominance was quantified as the proportional contribution of the most abundant species within each plot and vegetation layer.The dataset also includes environmental variables used in the analyses, including mean annual temperature, mean annual precipitation, elevation, stand age, geographic coordinates, and ecoregion identity. Monthly climate data were derived from the CHELSA climate dataset and were used to calculate long-term climatic means for each sampling plot.These data support analyses of linear mixed-effects models and piecewise structural equation models used in the associated study and provide the source data required to reproduce the main results on biotic and environmental controls of multi-layer forest community structure.