Nitrous oxide (N 2 O) reductase, the sole natural microbial sink for N 2 O, exists in two microbial clades: nosZ I and nosZ II. Although previous studies have explored inter‐clade ecological differentiation, the intra‐clade variations and their implications for N 2 O dynamics remain understudied. This study investigated both inter‐ and intra‐clade ecological differentiation among N 2 O reducers, the drivers influencing these p...