• 关键词：滆湖  水华初期  浮游植物  相关性  叶绿素a  水温

• 基金项目：国家重大水体污染治理专项（No.2017ZX07202006）

• 管祥洋
• 1. 常州大学环境与安全工程学院, 常州 213164;2. 生态环境部南京环境科学研究所, 南京 210042

• 孔明
• 生态环境部南京环境科学研究所, 南京 210042

• 张毅敏
• 生态环境部南京环境科学研究所, 南京 210042

• 韩巍
• 中日友好环境保护中心, 北京 100029

• 杨飞
• 生态环境部南京环境科学研究所, 南京 210042

• 张志伟
• 生态环境部南京环境科学研究所, 南京 210042

• 顾诗云
• 1. 常州大学环境与安全工程学院, 常州 213164;2. 生态环境部南京环境科学研究所, 南京 210042

• 钱文瀚
• 1. 常州大学环境与安全工程学院, 常州 213164;2. 生态环境部南京环境科学研究所, 南京 210042

• 摘要：为探究滆湖水华初期浮游植物群落特征及与水环境因子的相关性，于2018年5—7月在全湖布设22个点，调查研究滆湖水华初期浮游植物群落时空分布特征，并对引起水华主导环境因子进行分析.结果表明：①共获得7门119属，优势属为绿藻门的小球藻与球团藻、蓝藻门的鞘丝藻与微囊藻，其中湖心区域浮游植物丰度与多样性小，均匀性低，属于中偏重污染区域；湖北区以北属于中污染区域，蓝藻堆积严重；西部沿岸及南端区域属于中偏轻污染区域.②冗余分析得出，湖心藻类与水温（T）有强相关性，与叶绿素a（Chl-a）、溶解性总磷（DTP）、pH、溶解氧（DO）呈一定正相关性；湖北区以北藻类与底泥有机质（OM）、水体悬浮物（SS）、Chl-a及DTP呈强相关性，与T呈一定相关性.T与多项环境因子相关，均值从26.1℃上升到32.4℃；OM与有机磷（OP）呈高度相关性（p<0.05，r=0.892）.水华发生的主导环境因子为T、DTP与pH，底泥OM及OP有一定影响.

• Abstract：This study was conducted to determine the characteristics of phytoplankton communities and their relationship with environmental factors during the initial algae bloom period in Gehu Lake. Twenty-two sampling sites were set up in the lake from May to July in 2018. The temporal and spatial distributions of phytoplanktonic communities during this period were investigated, and the dominant algae bloom-causing environmental factors were also analyzed. The results show that a total of 119 phytoplankton genera belonging to 7 phyla were identified. The dominant species were Chlorella and Volvox globator from the phylum Chlorophyta and Cyanobacterium and Microcystis from the phylum Cyanophyta. The central region of the lake had low phytoplankton abundance, diversity, and evenness, indicating the presence of heavy water pollution in this area. The northern region, which was covered with flourishing Cyanobacterium, was moderately polluted. The west coast and southern region were slightly polluted. Redundancy analysis results demonstrate that algae in the central region were significantly correlated with water temperature (T) and positively correlated with chlorophyll a (Chl-a), dissolved total phosphorus (DTP), pH, and dissolved oxygen (DO); algae in the northern region showed strong associations with sediment organic matter (OM), suspended solids (SS), Chl-a, and DTP, as well as some correlation with T. T was found to be related to multiple environmental factors, and the mean T increased from 26.1℃ to 32.4℃. Sediment OM was highly correlated with organic phosphorus (OP) (p<0.05; r=0.892). The dominant environmental factors causing algae blooms are T, DTP, and pH, while sediment OM and OP also have some effects.

• Key words：Gehu Lake  early stage of algae bloom  phytoplankton  correlation  chlorophyll a  water temperature

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