泉水型城市湖泊浮游植物功能群特征及其生态健康评价OA北大核心CSTPCD

Phytoplankton functional groups have been increasingly used to explain seasonal succession of phytoplankton communi-ties and environmental assessment for aquatic systems,but is still unclear for its use in the spring type lakes.To understand the temporal and spatial characteristics of phytoplankton functional groups and driving factors in spring type urban lakes in northern China,an investigation was conducted in Lake Daming,Jinan City during May to November 2020.The results showed that 94 phy-toplankton species from 6 phyla were identified during the study period,mainly composed of Chlorophyta(40.4％),Diatoma(34.0％)and Cyanophyta(16.0％).The dominant species were Microcystis sp.,Merismopedia minima and Synedra acus.The phytoplankton were divided into 21 functional groups with 6 dominant functional groups(D,J,Lo,MP,P and W1).The func-tional group of coda D mainly constituted by Synedra acus was the absolute predominance.The seasonal succession sequence of dominant functional groups was:D/J/P → D/Lo/MP/P/J/W1 → P/D/J.During the study period,the trophic level index(TLI(∑))and Q index had a range from 40.29 to 62.55,and from 1.91 to 2.36,respectively,indicating a medium health state for Lake Daming.These evaluation results were consistent with the diversity index.RDA results showed that water temperature,sa-linity,pH,CODMn,total nitrogen and total phosphorus were the main influencing factors.The dominance of functional group of co-da D,positively correlated with water temperature,but negatively correlated with salinity.This study demonstrated the potentials of the functional groups and ecological health index in representing the seasonal succession of phytoplankton communities and water quality status of lakes.