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引用本文:安瑞志,潘成梅,塔巴拉珍,杨欣兰,巴桑.西藏巴松错浮游植物功能群垂直分布特征及其与环境因子的关系.湖泊科学,2021,33(1):86-101. DOI:10.18307/2021.0114
An Ruizhi,Pan Chengmei,Taba Lazhen,Yang Xinlan,Ba Sang.Vertical distribution characteristics of phytoplankton functional groups and their relationships with environmental factors in Lake Basomtso, Tibet, China. J. Lake Sci.2021,33(1):86-101. DOI:10.18307/2021.0114
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西藏巴松错浮游植物功能群垂直分布特征及其与环境因子的关系
安瑞志1, 潘成梅1, 塔巴拉珍2, 杨欣兰3, 巴桑1
1.西藏大学理学院青藏高原湿地与流域生态实验室, 拉萨 850000;2.西藏自治区昌都市卡若区约巴乡乃通村教学点, 昌都 854000;3.西藏农牧科学院水产科学研究所, 拉萨 850032
摘要:
为了解青藏高原湖泊浮游植物功能群垂直分布特征与环境因子的关系,本文选取西藏东南部最大的高山冰川堰塞湖之一的巴松错为研究对象,于2017年11月(枯水期)和2018年9月(丰水期)在湖心利用挂锤式深水采样器进行浮游植物垂直分层采样,共设置7个断面,采集水样84个.应用浮游植物功能群、相关性分析、冗余分析(RDA)等方法,对巴松错浮游植物功能群垂直分布特征及其与环境因子的关系进行了研究.结果表明:1)巴松错水体稳定性强,水温有明显的分层现象,枯水期在30~60 m处形成温跃层,丰水期在1~15 m和30~60 m处形成双温跃层;2)巴松错浮游植物群落共鉴定7门76属242种,物种组成均表现为硅藻-蓝藻-绿藻型结构;3)根据浮游植物功能群分类方法,可划分为25个功能群,分别为A、B、C、D、E、F、G、H1、H2、J、LM、LO、M、MP、N、P、S1、S2、T、W1、W2、X1、X2、X3和Y,优势功能群从枯水期的MP、D、LO、P转变为丰水期的D、F、LO、MP、N、P,其中MP功能群为巴松错浮游植物群落绝对优势群;4)通过RDA表明,不同水情期浮游植物功能群垂直分布特征受环境因子影响差异较明显,整体上,pH、总氮和氨氮浓度是影响浮游植物功能群分布格局的主要环境因子.
关键词:  巴松措  浮游植物  功能群  环境因子  垂直分布
DOI:10.18307/2021.0114
分类号:
基金项目:国家自然科学基金项目(31660620)和2019年中央支持地方高校发展专项资金项目(藏财教指〔2019〕01号)联合资助.
Vertical distribution characteristics of phytoplankton functional groups and their relationships with environmental factors in Lake Basomtso, Tibet, China
An Ruizhi1, Pan Chengmei1, Taba Lazhen2, Yang Xinlan3, Ba Sang1
1.Laboratory of Wetland and Catchments Ecology in Tibetan Plateau, Faculty of Natural Sciences, Tibet University, Lhasa 850000, P. R. China;2.Teaching Site of Naitong Village, Yueba Township, Kharo District, Qamdo City, Tibet Autonomous Region, Qamdo 854000, P. R. China;3.Institute of Fisheries Science, Tibet Academy of Agriculture and Animal Husbandry, Lhasa 850032, P. R. China
Abstract:
In order to understand vertical distribution characteristics of phytoplankton functional groups and their relationships with environmental factors in the lakes of the Qinghai-Tibet plateau, this paper takes Lake Basomtso, which is one of the biggest alpine glacier lakes in southeast Tibet, as the research object, a total of 84 samples were collected from seven vertical stratifications by using vertical stratified sampling of phytoplankton in the center of the lake with hammer hung deep water samplers in the dry ( November 2017) and wet ( September 2018) seasons. Using the methods of phytoplankton functional group, correlation analysis and redundancy analysis (RDA), the vertical distribution characteristics among functional groups of phytoplankton in Lake Basomtso and its relationship with environmental factors were studied. The results showed that: 1) Lake Basomtso exhibited highly water stable, and the water temperature is obviously stratified. The thermocline is located at a water depth of 30-60 m in the dry season, and the double thermocline is located at a water depth of 1-15 m and 30-60 m in the wet season. 2) The phytoplankton community in Lake Basomtso was identified with 242 species from 7 families, 76 genera, and the species composition was bacillariophyta-cyanophyta-chlorophyta. 3) According to the functional group classification method of the phytoplankton, it can be divided into 25 functional groups, respectively, A, B, C, D, E, F, G, H1, H2, J, MP, LM, LO, M, N, P, S1, S2, T, W1, W2, X1, X2, X3 and Y, the dominant function groups change from MP, D, LO and P in the dry season to D, F, LO, MP, N and P in the wet season; MP functional group is the absolute dominant group of phytoplankton community in Lake Basomtso. 4) RDA results showed that the vertical distribution characteristics of phytoplankton functional groups were significantly affected by environmental factors in the different water regimen periods. On the whole, pH, total nitrogen and ammonia nitrogen were the main environmental factors affecting the distribution pattern of phytoplankton functional groups.
Key words:  Lake Basomtso  phytoplankton  functional group  environmental factors  vertical distribution
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