STUDIES ON THE CORRELATION AMONG VARIOUS BACTERIA AND PHYSICOCHEMICAL FACTORS IN THE NITROGEN CYCLE IN FISHPOND

A good number of samplings were taken from pond water and pond botton soil The statistic analytic results show that the biomass of the nitrite bacteria(including ammonifying bacteria, nitrobacteria, nitrifying bacteria and denitrifying bacteria)in general are closely correlated with various physicochemical factors(R0.06):Ammonifying bacteria are mainly correlated with dissolved oxygen; denitrifying bacteria are reverselly correlated with available phosphorus; nitrobacteria are reversely correlated with ammoniac nitrogen; Nitrifying bacteria are closely correlated with nitrites The bacteria are more closely correlated with heterotrophic bacteria:aerobic heterotrophic bacteria are significantly correlated with anaerobic heterotrophic bacteria; Denitrifying bacteria are significantly correlated with anaerobic heterotrophic bacteria; Denitrifying bacteria are significantly with aerobic heterotrophic bacteria Nitrobacteria are significantly reversed correlated with anaerobic heterotrophic bacteria But the proportion is quite weak among all the nitrite bacteria(R0.60)which indicates that the nitrite bacteria has a somewhat regulating function in water quality and there is no interdependant relation, each plays a role in its own.