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渭河流域典型水库浮游植物群落结构特征

周小愿**,张星朗,韩亚慧,王梅,高宏伟   

  1. (中国水产科学院黄河水产研究所, 西安 710086)
  • 出版日期:2013-10-10 发布日期:2013-10-10

Characteristics of phytoplankton community structure in typical reservoirs in Weihe River Basin of China.

ZHOU Xiao-yuan**, ZHANG Xing-lang, HAN Ya-hui, WANG Mei, GAO Hong-wei   

  1. (Yellow River Fisheries Institute, Chinese Academy of Fishery Sciences, Xi’an 710086, China)
  • Online:2013-10-10 Published:2013-10-10

摘要: 于2011年6月调查了渭河流域4座典型水库的浮游植物群落结构,运用β多样性指数、多维尺度分析和聚类分析对4座水库的浮游植物群落结构进行了划分,并探讨了群落结构差异的原因。结果表明:4座水库浮游植物种类共鉴定出8门40种(属),细胞密度为12.00×104~132.48×104 cells·L-1,生物量为0.39~3.29 mg·L-1;从浮游植物种类组成来看,4座水库均属于硅藻-绿藻型;石头河水库浮游植物的现存量主要集中于硅藻和裸藻,西骆峪水库主要集中在裸藻和绿藻上,桃曲坡水库浮游植物组成较为分散,细胞密度主要集中于绿藻、裸藻和金藻,而生物量则集中于裸藻、金藻和甲藻,三原西郊水库细胞密度以硅藻和蓝藻为主,而生物量则为硅藻和裸藻;4座水库浮游植物细胞密度和生物量的大小顺序为西郊水库>桃曲坡水库>西骆峪水库>石头河水库。多样性指数、多维尺度分析和聚类分析结果表明,可以将石头河水库和西骆峪水库的浮游植物归为一个类群,而桃曲坡和三原西郊水库划归为另外两个独立的类群;水库营养水平的不同可能是4座水库浮游植物群落结构差异的主要原因,光照和温度也可以部分解释浮游植物群落结构的差异。

关键词: 侧柏, 水分来源, 荆条, 氢氧稳定同位素, IsoSource模型, 降雨事件

Abstract:

In June 2011, an investigation was conducted on the community structure of phytoplankton in four typical reservoirs in the Weihe River Basin. By using the β diversity index, non-metric multidimensional scaling (NMDS), and cluster analysis, the phytoplankton community structure in the four reservoirs was classified, and the causes resulting in the differences in the community structure were analyzed. A total of 40 species and 8 genera of phytoplankton in the four reservoirs were identified. The cell density of the phytoplankton ranged from 12.00×104 to 132.48×104 cells·L-1, and the biomass ranged from 0.39 to 3.29 mg·L-1. In terms of species composition, the phytoplankton in the four reservoirs belonged to diatomchlorella. The standing biomass of the phytoplankton in Shitouhe reservoir was mainly consisted of Bacillariophyta and Euglenophyta, and that in Xiluoyu reservoir was mainly of Euglenophyta and Chlorophyta. The composition of the phytoplankton in Taoqupo reservoir was more disperse, but the cell density was mainly consisted of Chlorophyta, Euglenophyta and Chrysophyta, whereas the biomass was mainly of Euglenophyta, Chrysophyta, and Pyrrophyta. The cell density of the phytoplankton in Xijiao reservoir was mainly consisted of Bacillariophyta and Cyanophyta, and the biomass was mainly of Bacillariophyta and Euglenophyta. The cell density and biomass of the phytoplankton in the four reservoirs was decreased in the order of Xijiao reservoir, Taoqupo reservoir, Xiluoyu reservoir, and Shitouhe reservoir. According to the β diversity index, NMDS, and cluster analysis, the phytoplankton community in Shitouhe and Xiluoyu reservoirs could be classified as a common group, while that in Taoqupo and Xijiao reservoirs could be classified as two other independent groups. The variations of the phytoplankton community structure among the four reservoirs could be primarily attributed to the differences in trophic levels. In addition, illumination and temperature could partly account for these variations.
 

Key words: Platycladus orientalis, water source, Vitex negundo var. heterophylla, precipitation events., hydrogen and oxygen stable isotopes, IsoSource model