Figure 4.
Average relative abundances of nosZ in clade I (a) and nosZ in clade II (b) sequences affiliated with taxonomic groups at the genus level. Each group is labeled with its genus name, with its phylum or subphylum name in parenthesis. Groups with <1% sequence number in the 18 soil samples were merged into the “Others” group. α, β, and γ represent alpha-, beta-, and gamma-proteobacteria, respectively. The underlined taxonomic name in (b) indicates an Archaea group.