辽河辽中段浮游藻类研究及水质评价

Study on Phytoplankton in Liaozhong Section of Liao River and Water Evaluation

为了解辽河水体中藻类群落特征和水质状况,于2019年6月调查分析了位于辽中县的老达房林业队的辽河水体中的浮游藻类种类构成、优势度和生物多样性指数,并测定了水体的理化指标。共记录到浮游藻类37种,其中绿藻门18种,硅藻门9种,蓝藻门4种,隐藻门、裸藻门各2种,甲藻门和金藻门各1种。各藻类丰度为1×104~216×104个/L,其中丰度较高的藻类包括蓝藻门的伪鱼腥藻、硅藻门的小环藻和针杆藻,它们的优势度也较高。通过藻类的生物多样性指数判断该段水体呈轻-中污染状态,而按理化指标判断该段水体的水质为V类,导致水质差的主要因素是COD指标偏高。

To reveal the phytoplankton community and water quality,the biological diversity of algea,dominant species,physical and chemical indicators were assessed in June,2019 at forestry team of Lao Dafang located in Liaozhong County along Liao River.The result showed that total 37 species belonging 7 divisions were identified to be mainly composed of the Cyanophyta(18 species),Bacillariophyta(9 species),and Chlorophyta(4 species).The abundances of algea were between 1×104~216×104 ind./L.The most dominant species were Pseudoanabaena sp.,Cyclotella sp.and Synedra sp..The water quality belonged to light to middle polluted level according to the biological diversity indexes.The water quality was at the V level judged by physical and chemical indicators because COD level was high.