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Relative abundance of abundant phylotypes (A) and rare phylotypes (B) at the phylum or class (only for Proteobacteria) level. Abundant phylotypes refer to those microbial groups with relative abundance (RA) >1.0% under all treatments. Rare phylotypes refer to those microbial group with RA <1.0% under at least one treatment and >0.1% under all other treatments. The statistical analysis results are the same as those in Figure 6. All other designations are the same as those in Figure 2.
