摘要
为了评估汾河水库浮游植物季节变化规律与水环境因子的关系,依据汾河水库形状及水文特征,在库区设置了 7个采样点,于2020年10月以及2021年3月、6月和9月对汾河水库浮游植物种群和水环境因子进行了 4次调查,分析了汾河水库水环境质量,探讨了库区浮游植物对水环境变化的响应.研究结果表明,在汾河水库的样品中,共鉴定出浮游植物8门93属245种,优势类群为绿藻-硅藻型,2021年3月主要以硅藻门为主,2021年6月、9月和2020年10月以绿藻门为主;汾河水库综合营养状况指数为28.07,属于贫营养型水库;叶绿素a含量与水温、气温、亚硝态氮含量显著正相关,说明水温、气温和亚硝态氮含量是影响浮游植物生长的限制因子;汾河水库浮游植物密度与水温、溶解氧含量、透明度、悬浮物含量、高锰酸盐指数、氨氮含量、亚硝态氮含量显著相关;汾河水库浮游植物群落结构变化主要受水温影响.汾河水库的水体为贫营养型水体,水质较好,其浮游植物群落结构、密度和生物量随时间变化明显,且受水环境因子的影响.
Abstract
To evaluate the seasonal variations in phytoplankton and their relationship with environmental factors in the Fenhe Reservoir,seven sampling points were set up in the reservoir area based on its shape and hydrological characteristics.Four surveys of environmental factors and phytoplankton in the Fenhe Reservoir were conducted in October 2020,March 2021,June 2021,and September 2021.The water quality of the Fenhe Reservoir was analyzed,and the response of phytoplankton to environmental changes was explored.The study identified a total of 245 species of phytoplankton belonging to 93 genera and 8 phyla in the Fenhe Reservoir.The dominant groups were green algae and diatoms.In March 2021,Bacillariophyta was predominant,while Chlorophyta was dominant in June 2021,September 2021,and October 2020.The comprehensive trophic state index of the Fenhe Reservoir was 28.07,classifying it as an oligotrophic reservoir.The chlorophyll-a content was significantly positively correlated with water temperature,air temperature,and nitrite nitrogen content,indicating that water temperature,air temperature,and nitrite nitrogen content are limiting factors for phytoplankton growth.Phytoplankton density in the Fenhe Reservoir was significantly correlated with water temperature,dissolved oxygen content,transparency,suspended solids content,permanganate index,ammonia nitrogen content,and nitrite nitrogen content.The variations in phytoplankton community structure in the Fenhe Reservoir were mainly influenced by water temperature.The comprehensive nutrient evaluation classified the Fenhe Reservoir as an oligotrophic,with good water quality.The structure,density,and biomass of the phytoplankton community varied significantly over time and were influenced by water environmental factors.
基金项目
山西省水产研究所-山西农业大学横向项目(2020HX39)
山西省水利科学技术项目(20230312)
NETL
NSTL
万方数据