Editorial: Effects of metal contamination on ammonia-oxidizing microorganisms in a freshwater reservoir

Ammonia-oxidizing microorganisms,including ammoniaoxidizing bacteria(AOB)and archaea(AOA),are important to the global nitrogen cycle.These microbes catalyze the oxidization of ammonia(NH3)to nitrite(NO2-),the ratelimiting step in the biogeochemical cycling of nitrogen(Stahl and de la Torre,2012).