Distribution characteristics of phytoplankton communities and their influencing factors along the Middle Route of South-to-North Water Diversion Project

• 1.中国科学院淡水生态与生物技术国家重点实验室

• 2.水生生物研究所

• 3.中国科学院大学

• 4.betway官方app 河南省丹江口水库水域生态系统野外科学观测研究站

南水北调中线浮游植物群落分布特征及其影响因子.pdf

摘要(Abstract)：

为探究南水北调中线干渠浮游植物群落沿线分布特征，于2019年夏季和冬季从源头的丹江口水库到干渠末端北京和天津开展原位调查，共鉴定浮游植物7门76属128种，其中硅藻53种，绿藻46种，蓝藻16种，隐藻、裸藻、甲藻、金藻较少.细胞密度变化范围为2.92×10⁵～2.78×105～2.78×10⁷L7 L^(-1),夏季细胞密度远高于冬季(F=73.454,P=0.000),以蓝藻和绿藻为主，冬季硅藻占优势；空间上丹江口水库10个样点与干渠8个样点细胞密度无显著差异(F=0.093,P=0.763).α多样性分析显示，夏季的物种丰富度、Shannon-Wiener指数和均匀性指数均高于冬季，且差异显著；但空间差异不显著.浮游植物群落在时间和空间上β多样性差异显著(时间：R=0.682,P=0.001;空间：R=0.497,P=0.001).RDA结果显示TN、NO(-1),夏季细胞密度远高于冬季(F=73.454,P=0.000),以蓝藻和绿藻为主，冬季硅藻占优势；空间上丹江口水库10个样点与干渠8个样点细胞密度无显著差异(F=0.093,P=0.763).α多样性分析显示，夏季的物种丰富度、Shannon-Wiener指数和均匀性指数均高于冬季，且差异显著；但空间差异不显著.浮游植物群落在时间和空间上β多样性差异显著(时间：R=0.682,P=0.001;空间：R=0.497,P=0.001).RDA结果显示TN、NO^-_3-N、PO_4-_3-N、PO_4^(3-)-P是影响丹江口水库和干渠浮游植物群落组成的关键因子.
To study the community structure of phytoplankton along the Middle Route of South-to-North Water Diversion Project(MRP), and the changes in phytoplankton species in the MRP, a field investigation was conducted from the source Danjiangkou Reservoir to the end of channel in Beijing and Tianjin during summer and winter 2019. Here we tracked the spatial-temporal variation in phytoplankton composition, abundance and diversity in the MRP. A total of 128 phytoplankton species were identified, including 53 species of Bacillariophyta, 46 species of Chlorophyta, and 16 species as Cyanophyta. The cell density of phytoplankton in the MRP varied from 2.92×10(3-)-P是影响丹江口水库和干渠浮游植物群落组成的关键因子.
To study the community structure of phytoplankton along the Middle Route of South-to-North Water Diversion Project(MRP), and the changes in phytoplankton species in the MRP, a field investigation was conducted from the source Danjiangkou Reservoir to the end of channel in Beijing and Tianjin during summer and winter 2019. Here we tracked the spatial-temporal variation in phytoplankton composition, abundance and diversity in the MRP. A total of 128 phytoplankton species were identified, including 53 species of Bacillariophyta, 46 species of Chlorophyta, and 16 species as Cyanophyta. The cell density of phytoplankton in the MRP varied from 2.92×10⁵to 2.78×105 to 2.78×10⁷L7 L^(-1), with a higher density in summer than in winter(F=73.454, P=0.000). In summer, Cyanophyta and Chlorophyta were dominant, while in winter, Bacillariophyta were dominant. There was no significant difference in cell density between the source Danjiangkou Reservoir and the channel(F=0.093, P=0.763). Cyanophyta, Chlorophyta and Bacillariophyta dominated the Danjiangkou Reservoir, while Chlorophyta and Bacillariophyta dominanted the channel. The α diversity analysis showed that species richness, Shannon-Wiener index and Evenness index were higher in summer than in winter, and the difference was significant, but there was no significant difference between the two regions spatially. The β diversity analysis showed that the phytoplankton community was significantly different temporally and spatially(temporal: R=0.682, P=0.001; spatial: R=0.497, P=0.001). The redundancy analysis showed that TN, NO(-1), with a higher density in summer than in winter(F=73.454, P=0.000). In summer, Cyanophyta and Chlorophyta were dominant, while in winter, Bacillariophyta were dominant. There was no significant difference in cell density between the source Danjiangkou Reservoir and the channel(F=0.093, P=0.763). Cyanophyta, Chlorophyta and Bacillariophyta dominated the Danjiangkou Reservoir, while Chlorophyta and Bacillariophyta dominanted the channel. The α diversity analysis showed that species richness, Shannon-Wiener index and Evenness index were higher in summer than in winter, and the difference was significant, but there was no significant difference between the two regions spatially. The β diversity analysis showed that the phytoplankton community was significantly different temporally and spatially(temporal: R=0.682, P=0.001; spatial: R=0.497, P=0.001). The redundancy analysis showed that TN, NO^-_3-N, PO■-P were the key factors explaining the differences in phytoplankton community structure between the two regions.

关键词(KeyWords)：丹江口水库;中线干渠;浮游植物;群落结构
Danjiangkou Reservoir;the MRP;phytoplankton;community structure

基金项目(Foundation):国家重点研发计划资助(2021YFC3200900);; 国家自然科学基金(51609239);; 中国博士后科学基金面上基金(2016M602394)

作者(Authors):宋高飞;张春梅;朱宇轩;张羽珩;万栋;刘洋;毕永红;
Song Gaofei;Zhang Chunmei;Zhu Yuxuan;Zhang Yuheng;Wan Dong;Liu Yang;Bi Yonghong;State Key Laboratory of Fresh Water Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences;University of Chinese Academy of Sciences;Observation and Research Station on Water Ecosystem in Danjiangkou Reservoir of Henan Province, Henan Normal University;

DOI:10.16366/j.cnki.1000-2367.2023.04.003

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