| 摘要: |
| 富营养化削弱了湖泊原有的生态和景观功能，湖泊的污染控制和生态恢复已成为人们关注和研究焦点之一。随着富营养化治理措施的实施，湖泊浮游生物群落结构也会发生相应变化。研究湖泊生态修复前后浮游生物群落结构的变化有助于评估湖泊生态修复效果。本研究以南京市玄武湖生态工程试验区（修复区）与未修复区为研究地点，分别对两区的浮游生物群落结构进行了季度调查，并分析了浮游生物群落结构与环境影响因子的关系。调查结果表明，浮游植物共包括8门85种，以绿藻门、硅藻门为主，浮游动物共3门48种，以轮虫为主。未修复区浮游动物、浮游植物丰度（161.19ind./L、6.79×106cells/L）与生物量（0.67mg/L、11.18mg/L）均高于修复区（40.92ind./L、2.48×106cells/L、0.17 mg/L、4.07 mg/L），这表明修复区大型沉水植物为主要初级生产者的生态系统结构对浮游生物的群落结构具有较大的影响。浮游生物总丰度、总生物量均为夏、秋季高于春季，冬季最低，表明浮游生物群落有明显的季节变化规律。此外，修复区浮游植物物种数、生物多样性指数均高于未修复区。冗余分析（RDA）表明，蓝藻门、黄藻门与pH、水温（WT）、亚硝酸盐（NO2--N）呈现正相关关系，与透明度（SD）、溶解氧（DO）呈高度负相关关系；浮游动物与水温（WT）呈正相关，与总氮（TN）、溶解氧（DO）呈负相关。上述研究结果可为湖泊生态调控与维护提供参考依据。 |
| 关键词: 玄武湖 浮游植物 浮游动物 环境因子 生态修复 |
| DOI： |
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| 基金项目:国家自然科学基金(32471640, 32330068)，江苏省碳专项(BK20231515)，中国科学院青年创新促进会项目（2023328） |
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| Analysis of Seasonal Dynamics and Influencing Factors in Plankton Communities of Ecologically Restored and Unrestored Zones in Xuanwu Lake |
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Ailifeire Anwaier1, Ma Jing-jing1, Su Ya-ling1,2,3,4,3, Wu Zhaoshi
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1.State Key Laboratory of Lake Science and Environment,Nanjing Institute of Geography and Limnology,Chinese Academy of Science;2.PR China: University of Chinese Academy of Sciences;3.PR China;4.: Chongqing Three Gorges University,Chongqing Key Laboratory of Water Environment Evolution and Pollution Control in the Three Gorges Reservoir Area
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| Abstract: |
| Eutrophication has markedly compromised the ecological integrity and aesthetic appeal of lakes, thereby stimulating an intensified emphasis on lake management and ecological rehabilitation efforts. The implementation of eutrophication management strategies is expected to induce shifts in the plankton community structure. Monitoring these changes is instrumental for assessing the efficacy of ecological restoration efforts. This study focuses on Lake Xuanwu in Nanjing, comparing an ecologically restored section with an unrestored one as study sites. We conducted a seasonal investigation of the plankton community structure across the restored, lotus-dominated, and unrestored areas over four distinct seasons. Additionally, we analyzed the correlation between plankton community structure and various environmental parameters. Our findings revealed a diverse phytoplankton community comprising 85 species across 8 phyla, with Chlorophyta and Bacillariophyta predominating. The zooplankton community consisted of 48 species within 3 phyla. A comparative analysis showed higher abundance (161.19ind./L, 6.79×106cells/L) and biomass (0.67mg/L, 11.18mg/L) of plankton in the unrestored basin compared to the restored basin (40.92ind./L, 2.48×106cells/L, 0.17mg/L, 4.07mg/L) suggesting that restoration efforts, particularly the reintroduction of submerged vegetation, have a significant impact on both the abundance and the community composition of phytoplankton and zooplankton. Seasonal variations were evident, with plankton abundance and biomass peaking in the summer and autumn and reaching their nadir in winter, indicative of dynamic shifts in the plankton community structure throughout the year. Furthermore, the number of phytoplankton species and the biodiversity index in the restored basin were higher than those in the unrestored basin. Redundancy analysis (RDA) indicated that Cyanophyta and Xanthophyta exhibited positive correlations with pH, water temperature (WT), and nitrite (NO2--N), while they were highly negatively correlated with transparency (SD) and dissolved oxygen (DO). Additionally, zooplankton displayed a positive association with water temperature (WT) and a negative association with total nitrogen (TN) and dissolved oxygen (DO). These insights offer valuable guidance for the ecological management and conservation of shallow urban lakes. |
| Key words: Xuanwu Lake phytoplankton zooplankton environmental factor ecological restoration |
