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Random forest predictions of N2O concentrations in groundwater using different sets of genes, including 16S rRNA genes (A); all N cycling genes (B); all norB and nosZ genes (C); key (significantly increased/decreased) norB and nosZ genes (D); all norB genes (E); all nosZ genes (F); key norB genes (G); and key nosZ genes (H). All norB and nosZ key genes are listed in Table S4 in the supplemental material.
