于桥水库秋季浮游植物群落结构与水质因子的关系

Relationship between structure of phytoplankton community and water quality factors in Yuqiao Reservoir in autumn

针对于桥水库秋季藻类大量爆发引发的富营养化所导致的供水安全问题,研究了浮游植物群落结构与水质因子的关系,找出影响浮游植物群落结构的主要水质因子和富营养化的主控因子。结果显示,2009年秋季于桥水库共有浮游植物110种,隶属于7门52属,平均丰度为3.46×105个/L,优势种为弯形尖头藻、圆柱鱼腥藻、双头针杆藻、尖针杆藻;于桥水库水质总体处于中营养状态;浮游植物物种丰富度、丰度受水质变化影响较大,DO、pH、透明度是影响浮游植物群落结构的主要水质因子,磷是富营养化的主控因子。在现有的富营养化状况下,通过调控主要水质因子,控制群落结构,可以防止水华大规模爆发,确保水质安全。

Aimed at the problems of water security resulted of eutrophication caused by algae outbreaks in Yuqiao Reservoir in autumn,the relationship between structure of phytoplankton community and water quality factors was studied,at the same time,eutrophication main-control factors and principal water quality factors which influenced on structure of phytoplankton community were recognized.The results showed a total of 110 phytoplankton species was detected,which belonged to 52 genera,7 phylum;phytoplankton average abundance was 3.46×105 cells/L,and dominant species consisted of Synedra acus Kutz,Synedra amphicephala,Anabaena cylindricus,and Raphidiopsis curvata;The status of water quality was general mesotrophic;Changes of water quality had a greater impact on species number and abundance of the phytoplankton.DO,pH and transparency were primary water quality factors which influenced on structure of phytoplankton community,and phosphorus is the main controlling factor of eutrophication.Base on the current eutrophication in Yuqiao Reservoir,water security can be ensured by regulating water quality factors and community structure so as to avoid large scale of algae outbreak.