汤浦水库浮游植物功能群季节演替及关键驱动因子  

Seasonal Succession of Phytoplankton Functional Groups and Key Driving Factors in Tangpu Reservoir

作　　者：张俊芳[1] 胡晓红 马沛明[1] 陈威[1] 胡菊香[1] ZHANG Jun-fang;HU Xiao-hong;MA Pei-ming;CHEN Wei;HU Ju-xiang(Key Laboratory of Ecological Impacts of Hydraulic-Projects and Restoration of Aquatic Ecosystem of Ministry of Water Resources,Institute of Hydroecology,Ministry of Water Resources and Chinese Academy of Sciences,Wuhan 430079,P.R.China;River and Lake Protection and Construction Safety Center,Changjiang Water Resources Commission,Wuhan 430010,P.R.China)

机构地区：[1]水利部中国科学院水工程生态研究所,水利部水工程生态效应与生态修复重点实验室,湖北武汉430079 [2]长江水利委员会河湖保护与建安中心,湖北武汉430010

出　　处：《水生态学杂志》2021年第3期55-62,共8页Journal of Hydroecology

基　　金：国家自然科学基金项目(51209148,31000188,51279113);绍兴市重点社会发展科研项目(2011A23005);中国科学院野外站联盟项目(KFJ-SW-YW036)。

摘　　要：为探究浮游植物功能群季节演替规律及其关键驱动因子,在汤浦水库流域布设6个采样点,于2012年每月中旬对浮游植物和环境指标进行一次采样调查。运用浮游植物功能类群(Functional group,FG)方法和冗余分析(Redundancy analysis,RDA)对数据进行分析。结果显示,调查期间汤浦水库共鉴定到浮游植物7门、117种,细胞密度月均值为9.37×10^(6)个/L,其中5月最高,极易暴发以硅藻和丝状蓝藻为主的藻类水华。按照功能群分类,汤浦水库浮游植物共划分出24个功能组类群,其中全年优势功能组类群9组,分别是C、D、F、J、LO、MP、P、S2、X2;每月浮游植物优势功能组类群共15组,其季节演替趋势为C+P→C+D+S2→C+P+S1→LO+P→F+J+S1→P+S2→D→MP+S2→C+MP+X2→C+P。RDA排序结果表明,空间异质性规律不明显,时间异质性呈现出一定的季节规律;其中,水温(WT)、水力滞留时间(HRT)和高锰酸盐指数(CODMn)是影响浮游植物功能群最显著的环境因子。Tangpu reservoir is located at the junction of Shaoxing City and Shangyu City in Zhejiang Province.It is a lake-like reservoir with a long hydraulic retention time and slow water exchange that provides important ecological services including water supply,flood control and water quality improvement.In this study,a systematic investigation of phytoplankton and water quality variables in Tangpu reservoir was carried out monthly at six sampling sites in 2012.The objectives were to characterize seasonal succession of phytoplankton functional groups in Tangpu reservoir and identify the factors driving succession.Phytoplankton were categorized by functional group(FG)and the spatiotemporal distribution of the phytoplankton community and its relationship with the environmental variables were analyzed by redundancy analysis(RDA).The study provides data supporting water quality protection and ecosystem management in Tangpu reservoir.A total of 117 phytoplankton species from 7 phyla were identified during the investigation,dominated by Chlorophyta(48 species),Bacillariophyta(34 species)and Cyanophyta(20 species).The monthly average cell density of phytoplankton was 9.37×10^(6)cells/L and was highest in May(3.09×10^(7)cells/L)and lowest in August(2.33×10^(6)cells/L).In May,blooms of diatoms and filamentous cyanobacteria occurred.There were 24 phytoplankton functional groups identified in Tangpu reservoir,with 9 functional groups dominant over the entire year(C,D,F,J,LO,MP,P,S2,X2)and 15 functional groups dominant in different months,with the following seasonal succession;C+P→C+D+S2→C+P+S1→LO+P→F+J+S1→P+S2→D→MP+S2→C+MP+X2→C+P.RDA indicated that phytoplankton functional groups followed a seasonal regularity,but spatial heterogeneity was not obvious.Water temperature(WT),hydraulic retention time(HRT)and chemical oxygen demand(CODMn)were the environmental variables most significantly affecting the phytoplankton functional groups.

关 键 词：汤浦水库 浮游植物功能群 季节演替 环境因子 

分 类 号：Q178.1[生物学—水生生物学]