3.3. Structure analysis of nitrogenous bacterial community
Nitrogenous bacteria plays an important role in nitrogen cycling ,so structure of such bacterial community was analyzed from aquacultural pond till 6th October. Nitrogen microorganisms, including ammonifying bacteria, nitrifying bacteria and denitrifying bacteria are a special group of bacteria, which keeps close relationship with nitrogen transformation in water body. They could decompose part of organic nitrogen and nitrate in aquacultural environment ,which acts like “buffer” and make water body cleaner than before. However, if NH4+-N and NO2−-N concentration were higher than expected value, they would deteriorate the environment.