| 城市人工湖泊浮游植物群落结构及环境因子分析 |
| Phytoplankton Community Structure and Its Relationship with Environmental Factors in an Urban Artificial Lake - Meixi Lake in Changsha City, China |
| 投稿时间：2022-03-16 修订日期：2022-04-24 |
| DOI：10.15928/j.1674-3075.202203160078 |
| 中文关键词:人工湖泊 浮游植物 环境因子 群落结构 梅溪湖 |
| 英文关键词:artificial lake phytoplankton environmental factors community structure trophic state Meixi Lake |
| 基金项目:国家自然科学基金委员会区域创新发展联合基金重点支持项目（U21A2002）；长沙市科技计划项目（kh2201040）；国家自然青年科学基金（32202944）；梅溪湖湖泊水质保障工程水质和水生态监测评估服务项目（XXSW20201101） |
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| 中文摘要: |
| 探究梅溪湖浮游植物群落结构与环境因子的关系，为城市人工湖泊水生态系统修复与治理提供基础资料与理论依据。以长沙市梅溪湖为研究对象，2020―2021年布设7个采样点按季度进行采样，分析浮游植物群落组成、时空分布及其与环境因子的关系。结果显示4个季度梅溪湖水体溶解氧、pH、氨氮、高锰酸盐指数等指标均处于Ⅱ类水质标准范围内，总磷处于Ⅱ~Ⅲ类水质标准，总氮在春秋冬季含量较高。共在梅溪湖检出浮游植物7门96种，其中以绿藻、硅藻和蓝藻种类数居多，占总种类数的86.46%，主要优势种为细小隐球藻（Aphanocapsa elacjista）、小环藻（Cyclotella sp.）、链状曲壳藻（Achnanthes catenata）和尖尾蓝隐藻（Chroomonas acuta），优势种具有明显季节交替性。浮游植物年均密度为（23.97±9.95）×106 cells/L，各季度东部水域密度均高于西部水域；多样性指数评价结果表明梅溪湖水体处于中度污染和中-富营养状态，与水质评价结果基本一致。浮游植物与环境因子基于转化的冗余分析结果显示，水温、氧化还原电位、总氮和亚硝酸盐氮是影响梅溪湖浮游植物群落的主要驱动因子。控制总氮等营养盐的输入将是改善梅溪湖水质和营养状态的有效手段。 |
| 英文摘要: |
| Meixi Lake, a new artificial lake, is part of the water management system for Xiangjiang New Area of Changsha City. The aquatic environment and ecology are foci for the high-quality development in Xiangjiang New Area. In this study, we analyzed the phytoplankton community structure in Meixi Lake, its relationship with environmental factors and then determined the trophic status of the lake. Our aim was to provide basic data to support ecological restoration and treatment of artificial urban lakes. In November (autumn) of 2020 and January (winter), April (spring) and July (summer) of 2021, water samples were collected at seven sampling sites in Meixi Lake for quantitative and qualitative analysis of phytoplankton and determination of water quality parameters. Results show that dissolved oxygen (DO), pH, ammonia nitrogen and the permanganate index (CODMn) met ClassⅡ surface water quality standards, total phosphorus (TP) met Class II or III surface water quality standards, and total nitrogen (TN) was high in spring, autumn and winter. A total of 96 phytoplankton species belonging to 7 phyla were identified, with Chlorophyta, Bacillariophyta and Cyanophyta, accounting for 86.46% of all species collected. The primary dominant species were Aphanocapsa elacjista, Cyclotella sp., Achnanthes catenata, Chroomonas acutathe, and displayed pronounced seasonal variation. The average annual density of phytoplankton was (23.97±9.95)×106cells/L, and phytoplankton density was higher in the eastern area of the lake than in the western area year-round. Diversity indices for the phytoplankton community indicate that Meixi Lake is moderately polluted and mesotrophic to eutrophic, consistent with the assessment based on water quality parameter values. Transformation-based redundancy analysis of phytoplankton and environmental factors show that water temperature, redox potential, total nitrogen and nitrite nitrogen are the primary driving factors affecting the phytoplankton community in Meixi Lake. Therefore, controlling nutrient inputs such as total nitrogen would be an effective means of improving water quality in Meixi Lake. |
| 魏秘,王瑞,王竹,周连凤,张俊芳,王辉,吕克强,韩增辉,彭增辉,胡菊香.2024.城市人工湖泊浮游植物群落结构及环境因子分析[J].水生态学杂志,45(2):92-101. |
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