青山水库藻类分布特征及相关性研究

Distribution characteristics and correlation analysis of algae in Qingshan reservoir

青山水库是杭州的饮用水源之一,其水质受生活污水、工业和农业等方面的影响。研究、跟踪调查了2018年4月至2019年3月青山水库藻类在水体中的分布情况,并分析了叶绿素a与藻类、环境因子的相关性。结果表明,青山水库的藻类常年以绿藻、蓝藻、硅甲藻为主,夏季以蓝藻为主;藻类主要集中在表层水中(水面下1~2 m);叶绿素a含量与绿藻、蓝藻、硅甲藻均呈极显著正相关;叶绿素a含量与水温、高锰酸盐指数呈极显著正相关,与pH呈显著正相关,与氨氮、硝酸盐氮、总铁、三价铁离子、锰呈显著负相关;逐步回归分析得出高锰酸盐指数、硝酸盐氮和水温是影响青山水库叶绿素a含量的主要因子,叶绿素a计算值与实测值拟合的相关性较好(R=0.920,P<0.01)。

Qingshan reservoir is one of the drinking water sources in Hangzhou,and the water quality is affected by domestic sewage,industry and agriculture.The distribution of algae in Qingshan reservoir from April 2018 to March 2019 was investigated,and the correlation between chlorophyll a and algae and environmental factors was analyzed.The analysis showed that the main algae in Qingshan Reservoir were green algae,blue-green algae and diatoms all the year round.Blue-green algae were the main species in summer.Algae were mainly distributed in surface water(1~2 m below the surface).Correlation analysis indicated that green algae,blue-green algae and diatoms were extremely significant correlated with chlorophyll a.Chlorophyll a was extremely significant associated with water temperature,CODMn and was a significant positive correlation with pH,and it had a negative correlation with ammonia nitrogen,nitrate nitrogen,total iron,trivalent iron ion and manganese.Stepwise regression analysis showed that CODMn,nitrate nitrogen and water temperature were the most important factors,which influenced the concentration of chlorophyll a in Qingshan reservoir.The calculated and measured values of chlorophyll a have a good correlation(R=0.920,P<0.01).