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引用本文:申恒伦,蔡庆华,邵美玲,徐耀阳.三峡水库香溪河流域梯级水库浮游植物群落结构特征.湖泊科学,2012,24(2):197-205. DOI:10.18307/2012.0205
SHEN Henglun,CAI Qinghua,SHAO Meiling,XU Yaoyang.Community structure characteristics of phytoplankton along a cascade of reservoirs in Xiangxi River Basin, Three Gorges Reservior. J. Lake Sci.2012,24(2):197-205. DOI:10.18307/2012.0205
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三峡水库香溪河流域梯级水库浮游植物群落结构特征
申恒伦1,2, 蔡庆华1, 邵美玲1,3, 徐耀阳1,3
1.中国科学院水生生物研究所淡水生态与生物技术国家重点实验室, 武汉 430072;2.中国科学院研究生院, 北京 100049;3.安徽师范大学生命科学学院, 芜湖 241000
摘要:
于2005年10月、2006年1、4、7月对三峡水库香溪河流域3座水库(古洞口一级水库、古洞口二级水库和香溪河库湾)组成的梯级水库的浮游植物种类组成、优势种、群落结构、密度和生物多样性指数进行了周年调查研究.共鉴定出浮游植物7门58属121种(含变种),以绿藻和硅藻种类最多,绿藻有26属49种,占40.50%;硅藻14属41种,占33.88%;其次是甲藻,3属11种,占9.09%;蓝藻5属7种,占5.79%;隐藻3属7种,占5.79%;其它藻类仅占4.96%.浮游植物在古洞口一级水库共有25属31种,古洞口二级水库29属40种,香溪河库湾46属81种.优势度分析显示:古洞口一级水库藻类优势类群为硅藻门、绿藻门,古洞口二级水库为硅藻门、隐藻门和甲藻门,香溪河库湾为绿藻门、硅藻门、甲藻门和隐藻门.3座水库浮游植物年均密度分别为1.110×106、4.837×105和1.734×106 cells/L;其中,最高密度出现在香溪河库湾(4.87×106 cells/L),最低密度出现在古洞口二级水库(5.76×105 cells/L).运用主成分分析对梯级水库进行水质分析,表明沿着水库的梯度水质逐渐恶化.Shannon-Wiener多样性指数和Pielou均匀度指数在3座水库间无明显差异,而香溪河库湾Margalef丰富度指数显著大于古洞口一级、二级水库.前两个指数与浮游植物优势种的评价结果显示,香溪河流域梯级水库处于中污染状态.
关键词:  香溪河流域  梯级水库  浮游植物  优势类群  多样性评价  群落结构  三峡水库
DOI:10.18307/2012.0205
分类号:
基金项目:国家自然科学基金项目(40671197);国家水体污染控制与治理科技重大专项项目(2009ZX07528-003-04-01);中国科学院知识创新工程重要方向项目(KZCX2-YW-427);国家重点实验室专项经费项目(Y15B021F01)联合资助
Community structure characteristics of phytoplankton along a cascade of reservoirs in Xiangxi River Basin, Three Gorges Reservior
SHEN Henglun1,2, CAI Qinghua1, SHAO Meiling1,3, XU Yaoyang1,3
1.State Key Laboratory of Freshwater Ecology and Biotechnology of China, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, P. R. China;2.Graduate University of Chinese Academy of Sciences, Beijing 100049, P. R. China;3.College of Life Science, Anhui Normal University, Wuhu 241000, P. R. China
Abstract:
Xiangxi River originates from the Shennongjia Forest region and is the largest tributary in Hubei Province of Three Gorges Reservoir. Three reservoirs(Gudongkou Reservoir 1, Gudongkou Reservoir 2 and Xiangxi Bay of Three Gorges Reservoir) in Xiangxi River Basin were selected to investigate phytoplankton ecology in such a reservoir cascade system. In this study, phytoplankton composition, dominant species, community structure, abundance and biodiversity index were investigated and analyzed from October 2005 to July 2006. A total of 121 species, belonging to 58 genera in 7 phyla were identified, among which Chlorophyta(49 species of 26 genera) is the most important compontent, accounting for 40.50% of the total; followed by Bacillariophyta (41 species of 14 genera) for 33.88%, and Pyrrophyta(11 species of 3 genera) for 9.09%, Cyanophyta(7 species of 5 genera) for 5.79%, Cryptophyta(7 species of 3 genera) for 5.79% and other species for 4.96%. 31 species of 25 genera, 40 species of 29 genera and 81 species of 46 genera were found in Gudongkou Reservoir 1, 2, and Xiangxi Bay, respectively. The dominant species in Gudongkou Reservoir 1 belonged to Bacillariophyta, Chlorophyta, while Bacillariophyta, Cryptophyta and Pyrrophyta dominated in Gudongkou Reservoir 2. Chlorophyta, Bacillariophyta, Pyrrophyta, Cryptophyta also played an important role in Xiangxi Bay. The annual abundance of phytoplankton community in the three reservoirs was 1.110×106, 4.837×105 and 1.734×106 cells/L, respectively. It had highest density in Xiangxi Bay(4.87×106 cells/L) and lowest density in Gudongkou Reservoir 2(5.76×105 cells/L). Principal Component Analysis was applied to analyze the water quality of the three reservoirs. The result implies that the water quality was degrading along the cascade of reservoirs. There were no significant differences in diversity index(H) and evenness(J) among the three reservoirs, while the Margalef index of Xiangxi Bay was significantly larger than that of Gudongkou Reservoir 1 and Gudongkou Reservoir 2. The valuation results by the first two indices and dominant phytoplankton species showed that the cascade reservoirs in Xiangxi River Basin were of intermediate pollution state.
Key words:  Xiangxi River Basin  cascade of reservoirs  phytoplankton  dominant category  diversity evaluation  community structure  Three Gorges Reservoir
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