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Neighbor-joining phylogenetic trees of archaeal 16S rRNA (left) and amoA (right) clone sequences for the B, unsaturated C (C-u), and saturated C (C-s) horizons. Bootstrap values (n = 1,000) of greater than 50% are indicated at nodes. The tree is based on 690 (16S rRNA) and 575 (amoA) masked nucleotide positions. Both the archaeal 16S rRNA and amoA gene trees are rooted with the amoA-containing ammonia-oxidizing bacterium Nitrosomonas europaea.
