Effects of Nitrogen Phosphorus Ratio and Concentration on the Competitive Relationship Between Microcystis Aeruginosa and Chlorella Vulgaris
This study used low,medium,and high concentrations of P with concentrations of 0.05mg/L,0.4mg/L,and 1mg/L,and set up culture media with N/P ratios of 10,20,30,40,and 50,respectively,to conduct pure and mixed culture on Chlorella vulgaris and Microcystis aeruginosa,in order to study the effects of different N,P concentrations and ratios on the competitive relationship between the two algae.The results showed that the maximum biomass of the two algae in pure culture was significantly greater than that in mixed culture,indicating that the two algae exhibited competitive inhibition under mixed culture.Under mixed cultivation,Chlorella vulgaris has a maximum KR value of 1.47 at a P concentration of(0.4mg/L)and N/P of 20,indicating a more significant competitive advantage.This data can be used to construct healthy algal blooms dominated by beneficial algae in aquaculture,landscape water bodies,or rivers,lakes,and reservoirs,which can to some extent control blue-green algae outbreaks and provide a basis for controlling blue-green algae blooms in aquaculture related water bodies.
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