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孙来康, 杨涛, 万旭昊, 严雪溶, 胡长通, 郑奕文. 西安城市河流浮游植物群落结构及其与环境因子的关系[J]. 水生生物学报, 2023, 47(4): 543-555. DOI: 10.7541/2023.2021.0345
引用本文: 孙来康, 杨涛, 万旭昊, 严雪溶, 胡长通, 郑奕文. 西安城市河流浮游植物群落结构及其与环境因子的关系[J]. 水生生物学报, 2023, 47(4): 543-555. DOI: 10.7541/2023.2021.0345
SUN Lai-Kang, YANG Tao, WAN Xu-Hao, YAN Xue-Rong, HU Chang-Tong, ZHENG Yi-Wen. PHYTOPLANKTON COMMUNITY STRUCTURE AND ITS RELATIONSHIP WITH ENVIRONMENTAL FACTORS IN XI’AN URBAN RIVERS SYSTEM[J]. ACTA HYDROBIOLOGICA SINICA, 2023, 47(4): 543-555. DOI: 10.7541/2023.2021.0345
Citation: SUN Lai-Kang, YANG Tao, WAN Xu-Hao, YAN Xue-Rong, HU Chang-Tong, ZHENG Yi-Wen. PHYTOPLANKTON COMMUNITY STRUCTURE AND ITS RELATIONSHIP WITH ENVIRONMENTAL FACTORS IN XI’AN URBAN RIVERS SYSTEM[J]. ACTA HYDROBIOLOGICA SINICA, 2023, 47(4): 543-555. DOI: 10.7541/2023.2021.0345

西安城市河流浮游植物群落结构及其与环境因子的关系

PHYTOPLANKTON COMMUNITY STRUCTURE AND ITS RELATIONSHIP WITH ENVIRONMENTAL FACTORS IN XI’AN URBAN RIVERS SYSTEM

  • 摘要: 为探究西安市城市河流浮游植物群落结构特征及其与环境因子的关系, 分别于2020年10月和2021年6月对灞河、浐河、沣河及黑河共计24个采样点进行了浮游植物群落组成、细胞密度和生物量的调查研究, 并利用冗余分析(RDA)研究环境因子对浮游植物群落结构的影响。调查结果显示, 枯水期共鉴定出浮游植物6门115种, 主要包括蓝藻门(11.30%)、硅藻门(54.78%)及绿藻门(26.96%), 浮游植物细胞密度均值为(3.36±3.50)×106 cells/L, 生物量均值为(1.79±3.59) mg/L。丰水期共鉴定出浮游植物7门168种, 主要包括蓝藻门(7.74%)、硅藻门(51.79%)及绿藻门(29.76%), 浮游植物细胞密度均值为(9.17±9.73)×106 cells/L, 生物量均值为(6.54±11.57) mg/L。与枯水期相比, 丰水期在物种数量、细胞密度和生物量都大于枯水期。聚类分析结果表明, 西安城市河流大部分采样点之间浮游植物群落结构及水环境状况具有相似性, 而人类活动可能是导致其余点位具有空间差异性的主要原因。冗余分析(RNA)结果表明影响西安市城市河流浮游植物群落结构分布的主要环境因子有温度(Temp)、氨氮(NH3-N)、pH、溶解氧(DO)、河流宽度(Wide)及叶绿素(CHL)。综合环境因子、生物多样性指数、浮游植物群落结构及优势种得出4支水系中黑河水质最好, 灞河、沣河水质一般, 浐河水质较差。

     

    Abstract: As the largest city in Northwest China, the water ecological environment of Xi’an has been severely damaged with the expansion of city and the development of industrialization. In water ecological health assessment, phytoplankton can objectively evaluate water quality and nutritional health status of water bodies. In order to determin the relationship between structural characteristics of phytoplankton communities and environmental factors in the Xi’an city, the composition of phytoplankton community, phytoplankton cell density and phytoplankton biomass of 24 sampling points in the Bahe, Chanhe, Fenghe and Heihe River were investigated on October 2020 and June 2021. The results showed that 115 species of phytoplankton in 6 phyla were identified during the dry season. The main species include 11.30% Cyanophyta, 54.78% Bacillariophyta and 26.96% Chlorophyta. The average cell density of phytoplankton was (3.36±3.50)×106 cells/L, and the mean biomass was (1.79±3.59) mg/L. In addition, 168 species of phytoplankton were identified in 7 phyla during the wet season. The main species include 7.74% Cyanophyta, 51.79% Bacillariophyta and 29.76% Chlorophyta. The average cell density of phytoplankton was (9.17±9.73)%×106 cells/L, and the mean biomass was (6.54±11.57) mg/L. Compared with the dry season, the number of species, cell density and biomass in the wet season were larger than those in the dry season. Furthermore, the results of cluster analysis showed that the phytoplankton community structure and water environment condition were similar among most sampling points in the Xi’an urban river, and human interference may be the main reason for the spatial differences in the remaining points. The results of redundancy analysis (RNA) showed that the main environmental factors determing the distribution of phytoplankton community structure in urban river in the Xi’an city were temperature (Temp), ammonia nitrogen (NH3-N), pH, dissolved oxygen (DO), river width (Wide) and chlorophyll (CHL). Therefore, comprehensively considering the environmental factors, biodiversity index, phytoplankton community structure and dominant species showed that the water quality of Heihe River is the best among the four river systems, the water quality of Bahe River and Fenghe River is in average level, and the water quality of Chanhe River is poor.

     

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