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Co-occurrence networks of the microbial communities in control (CK) and acid rain (AR) treatments. Nodes represent different OTUs, and OTUs are colored by genus-level taxonomy. Edges indicate the significant (p < 0.05) relationships among different OTUs. AOA: ammonia-oxidizing archaea (A,B); nirS and nosZ: denitrifiers carrying nirS and nosZ genes, respectively (C–F). Number of edges (G). CK: non-acid addition, AR: pH 4.0 acid rain.
