Fig. 1

The diversity, structure, and composition of soil microbial communities in tobacco soil across eight altitudes. a The richness of soil bacterial, fungal, and protistan communities and the significance of ANOVA test: different letters indicate significant differences based on the false discovery rate P-value (P < 0.05). b Nonmetric multidimensional scaling (NMDS) analysis based on Bray–Curtis dissimilarity matrix of bacterial, fungal, and protistan communities (n = 76 per community). Ellipses represented the 95% confidence intervals. c Venn plot of the bacterial, fungal, and protistan communities. d Relative abundances of the dominant phyla of the bacterial, fungal, and protistan communities. The upper half circles are sample information, and the off-circles are species taxonomic information (phylum level)