湖泊科学2025，Vol.37Issue(6)：1897-1909,13.DOI:10.18307/2025.0611
南亚热带水库浮游植物群落特征及丝状蓝藻优势驱动因素研究:以广西大王滩水库为例
Phytoplankton community structure and driving factors of filamentous cyanobacteria domi-nance in south subtropical reservoirs:A case study of Dawangtan Reservoir,Guangxi
摘要
Abstract
Dawangtan Reservoir is a typical large drinking water source reservoir in the south subtropical region.Cyanobacterial dominance and algal blooms caused by eutrophication pose major threats to its water supply security.Understanding the characteris-tics of the phytoplankton community and the driving factors behind cyanobacterial dominance is of great significance for algal bloom prevention and the management of reservoir water supply safety.A quarterly investigation of the aquatic environment and phyto-plankton community in the Dawanqtan Reservoir was conducted in 2021 to explore the seasonal dynamics of the phytoplankton com-munity and the driving factors behind the dominance of filamentous cyanobacteria.The results indicated that the phytoplankton in Dawangtan Reservoir comprised 127 species from 7 phyla,with Chlorophyta,Bacillariophyta,and Cyanophyta being the dominant groups in terms of species composition,belonging to 26 functional groups.The phytoplankton cell density ranged from 1.2×106 to 430×106 cells/L,exhibiting the order of autumn＞spring＞winter＞summer,while the biomass ranged from 0.14 to 51 mg/L,with the order of autumn＞winter and spring＞summer.The dominant genera were Limnothrix and Pseudanabaena,and the func-tional group S1 was the long-term dominant functional group.The comprehensive trophic level index(TLI)of the reservoir ranged between 36.02 and 49.57,indicating a mesotrophic state.Mantel tests and redundancy analysis(RDA)revealed that water tem-perature,transparency,and nitrogen concentration were significant explanatory variables influencing the dominance of filamentous cyanobacteria.The absolute dominance of filamentous cyanobacteria occurred in Autumn,characterized by lower transparency and nitrogen concentration but higher water temperature,representing a high-risk period for blooms of Limnothrix and Pseudanabaena.Combined with functional group analysis,the results indicate that the turbid environment of large reservoirs is an important factor promoting the dominance of filamentous cyanobacteria.In Autumn,water temperature and nutrient conditions fall within the opti-mal range for the growth of Limnothrix and Pseudanabaena,serving as key drivers for their massive proliferation.Given the threat posed by filamentous cyanobacteria such as Limnothrix and Pseudanabaena,attention should be paid to the causes of increased tur-bidity and water color in reservoirs to improve water transparency and thereby limit the formation of filamentous cyanobacterial domi-nance.关键词
南亚热带水库/浮游植物/优势功能群/环境因子/丝状蓝藻Key words
South subtropical reservoir/phytoplankton/dominant function group/environmental factors/filamentous cyanobacteria引用本文复制引用
鲍航通,王楚尔,黄旭升,李一平,赵国理,李荣辉,朱雅,余敏,潘海平,王亚宁,王璨..南亚热带水库浮游植物群落特征及丝状蓝藻优势驱动因素研究:以广西大王滩水库为例[J].湖泊科学,2025,37(6):1897-1909,13.基金项目
国家自然科学基金项目(52039003,52079033)和国家重点研发计划项目(2023YFC3208900)联合资助. （52039003,52079033）
