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抚仙湖浮游植物群落结构、影响因子及水质评价
Phytoplankton Community Structure,Related Influencing Factors and the Evaluation of Water Quality in the Fuxian Lake
投稿时间:2018-07-26  修订日期:2018-11-26
DOI:10.19316/j.issn.1002-6002.2019.04.08
中文关键词:  抚仙湖  浮游植物  群落结构  冗余分析  环境因子
英文关键词:the Fuxian Lake  phytoplankton  community structure  redundancy analysis  environmental factor
基金项目:
作者单位
吉正元 玉溪市环境监测站,云南玉溪653100 
刘绍俊 玉溪市环境监测站,云南玉溪653100 
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中文摘要:
      为研究抚仙湖浮游植物群落结构及其与环境因子的关系。基于2017年4月(春季)、7月(夏季)、11月(秋季)和2018年2月(冬季)抚仙湖浮游植物和部分水质理化指标的监测数据,分析了浮游植物群落结构特征,通过冗余分析(RDA)研究了影响浮游植物群落结构的主要环境因子,同时运用藻类生物学法和综合营养状态指数法TLI(∑)对抚仙湖水质进行综合评价。结果表明,共鉴定出浮游植物7门54属,绿藻在种类组成上占绝对优势。不同季节浮游植物细胞密度存在明显变化,春季细胞密度最高(401.74×104 cells/L),其次为夏季(247.31×104 cells/L)和秋季(143.41×104 cells/L),冬季最低(88.98×104 cells/L)。浮游植物优势属在不同季节有所不同,各季节绝对优势属为伪鱼腥藻属(春季)、转板藻属(夏秋季)、小环藻属和蓝隐藻属(冬季)。Shannon-Wiener多样性指数(H′)和Pielou均匀度指数(J)变化趋势一致,夏季值最高,分别为2.76和0.64,冬季值最低,分别为2.13和0.50。Berger-Parker优势度指数(D)变化与H′和J相反,冬季最高(0.945),夏季最低(0.922)。RDA表明,水温、溶解氧和高锰酸盐指数是影响抚仙湖浮游植物群落结构的主要环境因子。综合评价认为,抚仙湖水质处于贫中营养状态。
英文摘要:
      This study aims to study the relationship between phytoplankton community structure and environmental factors in the Fuxian Lake. Based on the seasonal monitoring data of phytoplankton and some physicochemical indices of water quality in the Fuxian Lake in April, July, November, 2017 and February, 2018, the phytoplankton community structure characteristics were analyzed, and then their relationships with environmental factors were studied by redundancy analysis. At the same time, algal biological indices and comprehensive nutrition state index TLI (∑) were used to evaluate the water quality. The results showed that, a total of 54 genera, belonging to 7 phyla were identified, of which the most abundant group was Chlorophyta. The cell density of phytoplankton in different seasons changed significantly, the highest density appeared in spring (401.74×104 cells/L), followed by summer (247.31×104 cells/L), and then autumn (143.41×104 cells/L), the lowest density appeared in winter (88.98×104 cells/L). The dominant genera changed seasonally. The absolute dominant genera was Pseudanabaena in spring, Mougeotia in summer and autumn, Cyclotella and Chroomonas in winter. Seasonal variability was the same for the indices of Shannon-Wiener and Pielou evenness, they were 2.76,0.64 in summer (the highest), and decreased to 2.13,0.50 in winter (the lowest), respectively. The variation of Berger-Parker dominance index was opposite to the indices of Shannon-Wiener and Pielou evenness, with the highest value in winter (0.945) and the lowest value in summer (0.922). Redundancy analysis showed that water temperature, dissolved oxygen and permanganate index were the main environmental factors that influenced the phytoplankton community structure in the Fuxian Lake. The comprehensive evaluation showed that the water quality was oligo-mesotrophic in the Fuxian Lake.
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