摘要
于2017—2019年对澜沧江西藏段干流及支流(麦曲、金河、昂曲、热曲)共8个断面的浮游植物群落结构进行了调查,并分析了影响浮游植物分布的主要环境因子。结果表明:共鉴定出浮游植物6门49属119种,其中硅藻门最多,有87种,占总种类数的73.1%;各支流种类数较干流丰富;各调查断面的浮游植物密度为1.11×10^(4)~1.78×10^(7) cells·L^(-1),均值为1.57×10~6 cells·L^(-1);生物量为0.01~6.44 mg·L^(-1),均值为0.88 mg·L^(-1);除金河外,其余支流浮游植物的平均密度和生物量均高于干流的平均密度(8.71×10^(5) cells·L^(-1))和生物量(0.50 mg·L^(-1));春季浮游植物的平均密度(2.73×10~6 cells·L^(-1))和生物量(1.51 mg·L^(-1))均大于秋季(4.18×10^(5) cells·L^(-1),0.24 mg·L^(-1));澜沧江西藏段浮游植物的Shannon指数和Pielou均匀度指数均值分别为2.83和0.74;不同时间段干支流群落相似性分析结果显示,浮游植物的时空差异明显;Pearson相关性分析和冗余分析结果表明,对澜沧江西藏段浮游植物影响较大的环境因子是CODcr、pH、溶解氧和水温;建议对澜沧江西藏段浮游植物进行常态化监测,以期为澜沧江西藏段水生态保护和管理提供科学依据和数据支撑。
In this study, phytoplankton community structure were surveyed in eight sampling stations in both the main stream and the tributaries(Maiqu, Jinhe, Angqu, Requ) in the Tibet reaches of the Lancang River from 2017 to 2019, aiming to explore the relationship among phytoplankton and environmental factors. The results showed that there were 119 species of phytoplankton, belonging to 6 phyla and 49 genera. Bacillariophyta(87 species) were the dominant phytoplankton, accounting for 73.1% of the total species. Phytoplankton species diversity was higher in the tributaries than that in the main stream. The ranges of phytoplankton density and biomass were 1.11×10^(4)-1.78×10^(7) cells·Land 0.01-6.44 mg·L^(-1), with mean values of 1.57×10^(6) cells·Land 0.88 mg·L^(-1), respectively. The average density and biomass of phytoplankton in tributaries except Jinhe were higher than that in the main stream(8.71×10~5 cells·L, 0.50 mg·L^(-1)). The average density and biomass of phytoplankton in spring(2.73×10^(6) cells·L, 1.51 mg·L^(-1)) were higher than in autumn(4.18×10~5 cells·L, 0.24 mg·L^(-1)). The mean values of the Shannon diversity index and Pielou evenness index of the phytoplankton community in the Tibet reaches of the Lancang River were 2.83 and 0.74, respectively. The results of the community similarity analysis in different times showed substantial spatial and temporal variations of phytoplankton community. Results of Pearson correlation analysis and redundancy analysis showed that CODcr, pH, dissolved oxygen and water temperature were the key factors affecting phytoplankton in the Tibet reaches of Lancang River. We recommend regular monitoring of phytoplankton in order to provide a reference for water ecological protection and management in the Tibet reaches of Lancang River.
作者
杜红春
朱挺兵
龚进玲
胡飞飞
朱永久
杨德国
DU Hong-chun;ZHU Ting-bing;GONG Jin-ling;HU Fei-fei;ZHU Yong-jiu;YANG De-guo(Key Laboratory of Freshwater Biodiversity Conservation,Ministry of Agriculure and Rural Affairs of China,Yangtze River Fisheries Research Institute,Chinese Academy of Fisheries Science,Wuhan 430223,China)
出处
《生态学杂志》
CAS
CSCD
北大核心
2022年第9期1769-1777,共9页
Chinese Journal of Ecology
基金
农业财政专项(西藏重点水域渔业资源与环境调查)
财政部和农业农村部现代农业产业技术体系专项资金(CARS-46)
中国水产科学研究院院级创新团队项目(2020TD57)资助。
关键词
澜沧江
浮游植物
时空动态
环境因子
冗余分析
Lancang River
phytoplankton
spatial-temporal dynamic
environmental factor
redundancy analysis
