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a The abundance-weighted average rRNA operon copy number of significantly changed OTUs in control and N deposited samples. b Relative abundance of bacterial phylum in control and N deposited samples. c The percent change in relative abundances of microbial phyla induced by N deposition. d The average estimated rRNA copy number of OTUs derived from each phylum. Error bars indicate standard errors. Asterisks indicate significant differences. *P < 0.050; **P < 0.010
