养殖长茎葡萄蕨藻(Caulerpa lentillifera)污损微藻群落结构与水体pH和Eh变化的相关性

Correlation between community structure of fouling microalgae and changes of pH and Eh in water of artificial culture of Caulerpa lentillifera

为探讨水体的pH和氧化还原电位(Eh)与长茎葡萄蕨藻(Caulerpa lentillifera)养殖过程中污损微藻群落变化的相关性,在养殖池中安装酸度计和氧化还原电位仪,在夹苗板处放置微藻附着试验塑料挂板45块,试验90 d。每隔10 d提取5板,合并分析微藻种群结构,记录同期pH和Eh。结果表明,共检出硅藻门4属4种,蓝藻门4属4种;pH前50 d呈上升趋势,后40 d趋于稳定,Eh在90 d内一直呈上升趋势;在前期pH和Eh较低的状态下硅藻类种群为优势群落,后期较高时则以蓝藻类种群为优势群落。pH和Eh与污损微藻种群结构具有显著相关性,与蓝藻种群呈正相关,与硅藻种群呈负相关。

In the process of culturing Caulerpa lentillifera,in order to explore the correlation between the pH and redox potential(Eh)of water body and the changes of fouling microalgae community,the acidimeter and redox potentiometer were installed in the culture pond,and 45 pieces of plastic hanging plates for microalgae adhesion test were placed at the seedling clamping plate for 90 days.Five plates were extracted every 10 days to analyze the microalgae population structure and record the pH and Eh in the same period.The results showed that 4 species belonging to 4 genera of Bacillariophyta and 4 species belonging to 4 genera of Cyanophyta were detected;the pH increased in the first 50 days,then stabilized in the last 40 days,and the Eh showed an upward trend in 90 days;in the early stage,the Diatom population was the dominant community when the pH and Eh were lower,and in the later stage,the Cyanobacteria population was the dominant community when the pH was higher.pH and Eh were significantly correlated with the population structure of fouling microalgae,positively correlated with Cyanobacteria population,and negatively correlated with Diatom population.