金沙江中下游浮游植物功能群与环境因子的关系  

Relationship between Phytoplankton Functional Groups and EnvironmentalFactors in the Middle and Lower Reaches of Jinsha River

作　　者：龚进玲 朱挺兵[1] 杨德国[1] 胡飞飞 杜红春 李学梅[1] 孟子豪 吴兴兵[1] GONG Jin-ling;ZHU Ting-bing;YANG De-guo;HU Fei-fei;DU Hong-chun;LI Xue-mei;MENG Zi-hao;WU Xing-bing(Key Laboratory of Freshwater Biodiversity Conservation,Ministry of Agriculture and Rural Affairs of China,Yangtze River Fisheries Research Institute,Chinese Academy of Fisheries Science,Wuhan 430223,P.R.China)

机构地区：[1]中国水产科学研究院长江水产研究所,农业农村部淡水生物多样性保护重点实验室,湖北武汉430223

出　　处：《水生态学杂志》2023年第3期86-93,共8页Journal of Hydroecology

基　　金：农业财政专项“长江渔业资源与环境调查”;财政部和农业农村部:现代农业产业技术体系专项资金(CARS-46);中国水产科学研究院院级创新团队项目(2020TD57)。

摘　　要：分析不同季节浮游植物群落结构组成,明确主要环境影响因子,为金沙江干流水生生物保护和生态修复提供理论依据。于2019年春夏秋三季对金沙江中下游(河流水体和库区)浮游植物群落组成、功能群以及多样性指数进行调查,并分析了浮游植物功能群与环境因子的关系。结果表明:金沙江中下游共鉴定出浮游植物8门32科54属96种,以硅藻门(39.58%)为主,其次是绿藻门(31.25%),河流水体与库区在浮游植物群落组成上差异不显著;Shannon-Wiener指数、Margalef指数和Pielou指数平均值分别为2.42、1.81和0.92,单因素方差分析表明,3项多样性指数在各采样点之间、各季节之间无显著差异;浮游植物共划分出24种功能群,其中8种(D、P、X1、J、C、LM、F、G)为该区域的优势功能群。河流水体出现频率大于30%的浮游植物功能群有12种,主要优势功能群以D和P为主;库区有15种,主要优势功能群以D、J、P和X1为主。Pearson相关性分析和冗余分析(RDA)结果显示,温度、浊度、海拔、氨氮和硝态氮是影响金沙江中下游流域浮游植物功能群分布格局的主要因子。In this study,an investigation of phytoplankton community structure,functional group composition and diversity indices was conducted in the middle and lower reaches of Jinsha River(in both riverine and reservoir waters)in spring,summer and autumn of 2019.The relationship between phytoplankton functional groups and environmental factors was then analyzed based on the results.Water samples were collected at 11 sampling transects(7 in riverine water,4 in reservoir water)for quantitative and qualitative evaluation of phytoplankton and the water environment.A total of 96 phytoplankton species were identified,belonging to 54 genera,32 families and 8 phyla,with dominance by Bacillariophyta(39.58%)and Chlorophyta(31.25%).No significant difference in phytoplankton community composition was observed between the riverine and reservoir waters(P<0.05),with an average of 40 phytoplankton species in riverine water and slightly under 42 species in reservoir water.In terms of seasonal variation,the species richness of phytoplankton in spring and autumn(70 species in both seasons)was higher than in summer(56 species).The Shannon-Wiener diversity,Margalef richness and Pielou evenness indices of the phytoplankton community were,respectively,2.42,1.81 and 0.92,and one-way analysis of variance showed no significant differences in diversity indices among different sampling sites or seasons.A total of 24 phytoplankton functional groups were observed during the investigation,with 8 dominant functional groups(D,P,X1,J,C,LM,F,G).There were 12 functional groups in the riverine water ecosystem with an occurrence frequency exceeding 30%,and the dominant functional groups were D and P.There were 15 functional groups in the reservoir and D,J,P and X1 were dominant.Pearson correlation analysis and redundancy analysis show that water temperature(WT),turbidity(TUR),elevation(EL),ammonia nitrogen(NH_(4)^(+)-N)and nitrate nitrogen(NO_(3)^(-)-N)were the primary environmental factors affecting the functional groups in the middle and lower reaches of J

关 键 词：浮游植物 功能群 环境因子 金沙江 

分 类 号：S91[农业科学—水产科学]