微生物在氩循环中的作用 Nitrogen in atmosphere(N Plants Assimilation Denitrifying bacteria Nitrogen-fixing Nitrates bacteria in root (No3) nodules of Decomposers(aerobic legumes and anaerobic bacteria and fungi) Nitrifying Ammonification o0/ bacteria Nitrification 0s)[Ammonium(NH4 3 Nitrites (NO2 Nitrogen-fixing soil bacteria Nitrifying bacteria Copynght o Pearson Education, Inc, publishing as Be n Cummings微生物在氮循环中的作用 4