滇池北部围隔区蓝藻水华暴发主要影响因素及交互作用研究

Study on the Main Influencing Factors and Their Interaction of Cyanobacteria Outbreak in the Northern Enclosed Area of Dianchi Lake

对滇池北部围隔区蓝藻暴发的优势种群——铜绿微囊藻,通过3因素3水平正交试验设计,设定不同的光照强度、温度、氮磷比(N/P),探究所设定的3种因素对铜绿微囊藻生长影响的显著性及因素间的一级交互作用,确定最佳生长条件。结果表明,光照强度、温度、氮磷比3种因素及光照强度和温度的一级交互作用均对铜绿微囊藻的生长影响显著,以光照强度尤为明显,并得出最佳生长条件:光照3500lx,温度30℃,氮磷比15∶1。

The dominant population of cyanobacteria outbreaks in the northern enclosed area of Dianchi Lake is Microcystisaeruginosa. Through designing the 3 factors and 3 horizontal orthogonal test with setted various light intensity,temperature,nitrogen and phosphorus ratio,the effects of the three factors on the growth of Microcystisaeruginosa and their first-level interaction were explored,which helped to determine the optimal growth conditions. The results showed that all 3 factors covering light intensity,temperature,nitrogen and phosphorus ratio,and the first-level interaction of light intensity and temperature had significant effect on the growth of Microcystisaeruginosa.Light intensity was particularly significant. The optimal growth conditions were light intensity of 3500 lx,temperature of 30℃,nitrogen and phosphorus ratio of 15∶ 1.