Effects of Different Nitrogen on the Proliferation of Microcystis aeruginosa
不同氮源对铜绿微囊藻增殖的影响

Three nitrogen forms, nitrate, ammonium and urea, were selected to perform the growth experiments respectively in the laboratory. Microcystis aeruginosa, which is the preponderant cyanobacteria species, was studied with the algal batch culture method. The results show that: nitrate is superior to the other two nitrogen salt for this algae to growth, and its optimal concentration for cell proliferation is 1.5-5.0 mmol L-1. However, lower concentration of ammonium (0.5 mmol L-1) is optimal for the alga to grow, and higher ammonium concentration will restrain the growth of M. aeruginosa. And the optimal growth concentration of urea is 0.5-1.5 mmol L-1, which is also lower. These results not only offer scientific foundation for water bloom forecasting, but also enlighten us that it is not fit only to monitor total nitrogen when we are forecasting a cyanobacteria water bloom.