| 巢湖浮游植物群落季节动态变化特征及其影响因素 |
| Study on the Seasonal Succession of Phytoplankton Community and Its Driving Factors in Chaohu Lake |
| 投稿时间：2023-07-20 修订日期：2023-11-09 |
| DOI：10.19316/j.issn.1002-6002.2024.04.14 |
| 中文关键词: 巢湖 浮游植物 群落结构 季节动态 环境因子 |
| 英文关键词:Chaohu Lake phytoplankton community structure seasonal succession environmental factors |
| 基金项目:安徽省科技重大专项(202203a07020002);安徽省生态环境科研项目(2023hb0011) |
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| 通讯作者:张敏* 安徽省生态环境监测中心, 安徽 合肥 230071 |
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| 中文摘要: |
| 为了解巢湖浮游植物群落的季节动态变化特征及其与环境因子的关系,分别于2022年1月(冬季)、4月(春季)、7月(夏季)和10月(秋季)对巢湖水质状况和浮游植物变化情况进行了调查与分析。结果显示,在监测时段内,共鉴定出浮游植物7门60属110种,以绿藻门、蓝藻门和硅藻门为主。浮游植物细胞密度和群落结构存在明显的时空差异。其中,不同季节的全湖平均密度由高到低依次为秋季(10月)、春季(4月)、夏季(7月)和冬季(1月)，水华发生区域呈现由东向西逐步发展的趋势。优势种/属主要有微囊藻、水华长孢藻、水华束丝藻、土生假鱼腥藻、具尾逗隐藻、啮蚀隐藻和针形菱形藻。其中,冬季(1月)和春季(4月)由水华长孢藻占据绝对优势,夏季(7月)和秋季(10月)由微囊藻占据绝对优势,表现出明显的季节演替特征。冗余分析结果表明,溶解氧、电导率和pH为影响巢湖浮游植物群落结构变化的主要环境因子。Pearson相关性分析结果表明,水华长孢藻和微囊藻的季节演替与总磷、水温、溶解氧、透明度、浊度、电导率等环境因子显著相关。研究结果可为掌握巢湖水生态系统状况以及支撑巢湖水环境管理提供一定的基础数据。 |
| 英文摘要: |
| In order to understand the seasonal dynamic variations of phytoplankton community composition in Chaohu Lake and their relationship with environmental factors,water samples were systematically collected in January,April,July,and October in 2022 to investigate and analyze the water quality and phytoplankton changes in Chaohu Lake. The results revealed that 110 phytoplankton species,representing 60 genera distributed across seven phyla were identified during the monitoring period,mainly chlorophyta, cyanobacteria, and bacillariophyta. The study unveiled pronounced spatio-temporal variations in phytoplankton community composition and cell density,providing critical insights into the dynamics of phytoplankton populations. Furthermore, the study assessed phytoplankton diversity,ranking it in descending order from highest to lowest as follows:October (fall), April (spring), July (summer), and January (winter). Additionally, the investigation highlighted a distinct westward trend in water blooms across Chaohu Lake. The prevailing species and genera of phytoplankton included Microcystis spp.,Dolichospermum flosaquae, Aphanizomenon flos-aquae, Pseudanabaena mucicola, Komma caudata, Cryptomonas erosa, and Nitzschia acicularis. Dolichospermum flos-aquae demonstrated prevalence during the winter and spring, while Microcystis spp. dominated during the summer and autumn. Moreover,Dolichospermum flos-aquae and Microcystis spp. exhibited distinct patterns of seasonal succession, shedding light on their ecological dynamics. Redundancy Analysis (RDA) was conducted to identify the primary environmental factors influencing the phytoplankton community. The results indicated that dissolved oxygen,electrical conductivity,and pH were the pivotal environmental parameters shaping the phytoplankton community structure. Pearson correlation analysis further substantiated these findings by revealing significant correlations between the seasonal succession of Dolichospermum flos-aquae, Microcystis spp.,and various environmental factors,including total phosphorus,water temperature,dissolved oxygen,Secchi depth, turbidity,and electrical conductivity. The findings of this study provide crucial theoretical data for a comprehensive understanding of the aquatic ecosystem status in Chaohu Lake. Additionally,they offer valuable insights into managing the water environment in this region,serving as a foundation for sustainable environmental practices and policies. |
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