| 摘要: |
| 浮游植物功能群被广泛应用于解析地表水体浮游植物群落季节演替特征和水环境评价，而该方法能否应用于泉水型湖泊仍不明确。为了解我国北方城市泉水型湖泊浮游植物功能群时空特征及影响因子，于2020年5—11月，对济南大明湖不同季节进行采样调查及分析。结果表明：大明湖共鉴定出浮游植物6门94种，种类组成以绿藻门（40.4%）、硅藻门（34.0%）和蓝藻门（16.0%）为主，其中微囊藻（Microcystis sp.）、细小平裂藻（Merismopedia minima）和尖针杆藻（Synedra acus）为全年优势种。大明湖浮游植物群落可划分为21个功能群，其中优势功能群有6组（D、J、Lo、MP、P和W1），以尖针杆藻为代表的D功能群为绝对优势功能群。优势功能群季节演替序列为：D/J/P→D/Lo/MP/P/J/W1→P/D/J，季节性特征明显。综合营养状态指数（TLI）为40.92~62.55，生态健康状态指数（Q）为1.91~2.36，表明大明湖处于中等健康状态，评价结果与多样性指数评价结果相一致。RDA分析结果显示，温度、pH、盐度（Sal）、化学需氧量、氮和磷是影响大明湖浮游植物功能群的主要环境因子，其中优势功能群D主要受温度和盐度影响。研究结果表明，大明湖浮游植物功能群有明显的季节演替，利用基于功能群的Q指数能准确有效的评价水体健康及水质。 |
| 关键词: 大明湖 浮游植物功能群 Q指数 环境因子 冗余分析 |
| DOI： |
| 分类号: |
| 基金项目:山东省自然科学基金项目（ZR2021QC224，ZR2023ME204）、国家自然科学基金（51979241）、河北省湿地生态与保护重点实验室开放基金项目（hklk202202）和山东省高校青创科技计划（2020KJE008，2022KJ277）联合资助 |
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| Characteristics of phytoplankton functional groups and ecological health assessment in spring type urban lakes: A case study in Lake Daming, Jinan City |
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SHEN Henglun1, XU He1, JIANG Wanxiang1, ZHU Tianshun1, CHEN Jing1, FU Yao2, XU Yaoyang3
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1.College of Life Sciences,Zaozhuang University;2.Jinan Environmental Research Institute;3.Institute of Urban Environment,Chinese Academy of Sciences
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| Abstract: |
| Phytoplankton functional groups have been increasingly used to explain seasonal succession of phytoplankton communities 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 phytoplankton 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 functional 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 WT, pH, Sal, CODMn, TN and TP were the main influencing factors. The dominance of functional group of coda D, positively correlated with water temperature, but negatively correlated with salinity. This study demonstrated the potentials of the functional groups and Q index in representing the seasonal succession of phytoplankton communities and water quality status of lakes. |
| Key words: Lake Daming phytoplankton functional group Q index environmental factors redundancy analysis |
