FIG 1.

Effects of experimental treatments on soil microbial community functional gene richness (a) and their functional composition based on either all genes, accessory community genes, or core community genes (b to d). Error bars represent the standard errors (four replicates). The values in parentheses on the axes of panels b to d show the percentage of community compositional variation explained by the principal-component analysis (PCoA) axes. For clarity, only the significant (P < 0.05) statistical results are shown in the figure.