Contributions of ammonia-oxidizing archaea and bacteria to nitrification in Oregon forest soils

The rate of octyne-resistant (AOA) nitrification potential is strongly correlated with AOA amoA gene copy numbers. Soils are identified by site (CH-Cascade Head, black; HJA-H.J. Andrews, white; MF-McDonald Forest, gray) and tree type (DF-Douglas-fir, triangle; RA-red alder, circle). Line represents linear regression (R2 = 0.80, p < 0.01).