不同质量浓度的磷对铜绿微囊藻生长及细胞内磷的影响

Effect of Different P Mass Concentrations on Growth and P-in-cell of Microcystis aeruginosa

通过室内模拟的方法研究了在磷质量浓度不同的水体条件下,在铜绿微囊藻水华形成过程中微囊藻的增殖特征及细胞内磷、可溶性磷的变化特征。在模拟的太湖水体中,随着外源磷的增加,藻生长最终限制因素由磷限制(ρ(TP)≤0 045mg L)发展到光限制(ρ(TP)≥0 445mg L),而ρ(TP)=0 445mg L是微囊藻最适生长浓度;同时,微囊藻细胞内磷含量(QP)、水体可溶性磷(DTP)也随藻类生长而发生变化,在水体ρ(TP)<0 445mg L时,细胞内磷对微囊藻增殖有促进作用,而在ρ(TP)>0 445mg L的水体中,磷对微囊藻增殖有抑制作用。

The effects of different phosphorus concentrations of water system on DTP, P-in-cell content of tissues (QP) and cell multiplication of Microcystis aeruginosa were studied in laboratory experiments. In the simulative culture medium of Taihu Lake water, the growth of algae was limited by P-limited (ρ(TP)≤0.045 mg/L) firstly and then by light-limited (ρ(TP)≥0.445 mg/L) with the increase of P concentration in the medium, and (ρ(TP)=)0.445 mg/L was the best growth concentration. At the same time, the P-in-cell of Microcystis (QP) and DTP in the medium also changed. When ρ(TP)<0.445 mg/L, the cell multiplication of Microcystis aeruginosa was accelerated by the increase of P-in-cell content of Microcystis aeruginosa. Moreover, when ρ(TP)>0.445 mg/L, the cell multiplication of Microcystis aeruginosa was restrained by the content of P in the water system.