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引用本文:刘晓曦,陈丽,蒋伊能,尚丽,张涛,李蕊,赵帅营,陈光杰.抚仙湖浮游植物群落时空变化特征及其与环境因子的关系.湖泊科学,2020,32(3):793-803. DOI:10.18307/2020.0319
LIU Xiaoxi,CHEN Li,JIANG Yineng,SHANG Li,ZHANG Tao,LI Rui,ZHAO Shuaiying,CHEN Guangjie.Spatiotemporal variation of phytoplankton communities and their relationship with environmental factors in Lake Fuxian. J. Lake Sci.2020,32(3):793-803. DOI:10.18307/2020.0319
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抚仙湖浮游植物群落时空变化特征及其与环境因子的关系
刘晓曦, 陈丽, 蒋伊能, 尚丽, 张涛, 李蕊, 赵帅营, 陈光杰
云南师范大学旅游与地理科学学院, 云南省高原地理过程与环境变化重点实验室, 昆明 650500
摘要:
抚仙湖作为我国第二深水湖泊,是国家战略淡水资源的重要储库之一.随着气候变化及流域开发的增强,抚仙湖生物群落组成近年来发生了明显变化,水体水质和生态系统功能呈现降低的趋势.为了摸清浮游植物的时空分布特征及关键环境因子,本研究于2015年对抚仙湖南、中、北3个位点进行浮游植物群落和环境因子的逐月调查.结果显示,浮游植物群落由绿藻门、甲藻门、金藻门、硅藻门、蓝藻门和隐藻门组成.方差分析和相似性分析表明,环境因子、浮游植物生物量和群落结构存在显著的季节演替模式,而空间差异不明显.浮游植物的优势属种(按生物量)1月为隐球藻、丝藻、转板藻,2月为克罗脆杆藻、飞燕角甲藻、转板藻,3月为小环藻、转板藻,4-7月为锥囊藻、飞燕角甲藻、转板藻,8月为飞燕角甲藻、转板藻,9月为飞燕角甲藻、锥囊藻、转板藻,10月为飞燕角甲藻,11月为飞燕角甲藻、多甲藻、转板藻,12月为转板藻.Pearson相关分析显示,温度和总磷浓度与浮游植物生物量及群落结构呈显著相关,方差分解分析进一步表明水温和总磷浓度分别单独解释了浮游植物群落结构变化的26.0%和2.6%,共同解释了3.0%.与2002-2003年转板藻全年占优相比,2015年浮游植物群落结构发生了显著变化且生物量明显上升,可能反映了该水体营养水平长期上升的持续影响.
关键词:  抚仙湖  浮游植物  优势种  群落结构  环境因子
DOI:10.18307/2020.0319
分类号:
基金项目:云南省应用基础研究计划项目面上项目(2018FB077)、国家自然科学基金项目(41461096,41771239)和国家重点基础研究发展计划"973"项目(2014CB460607)联合资助.
Spatiotemporal variation of phytoplankton communities and their relationship with environmental factors in Lake Fuxian
LIU Xiaoxi, CHEN Li, JIANG Yineng, SHANG Li, ZHANG Tao, LI Rui, ZHAO Shuaiying, CHEN Guangjie
Yunnan Provincial Key Laboratory of Plateau Geographical Processes and Environmental Change, School of Tourism and Geography, Yunnan Normal University, Kunming 650500, P. R. China
Abstract:
As the second deepest lake in China, Lake Fuxian is one of the most important storages of the national strategic freshwater resources. With the intensification of climate change and catchment development, biological communities in Lake Fuxian had changed obviously in recent years with the deterioration of water quality and lake ecosystem health. We conducted a monthly survey of three sampling sites covering the south, central and north parts of the Lake Fuxian Basin in 2015 to identify the spatiotemporal pattern of phytoplankton communities and their environmental drivers. Our results showed that the phytoplankton community was composed of Chlorophyta, Pyrrophyta, Chrysophyta, Bacillariophyta, Cyanophyta and Cryptophyta, and there were strong seasonal fluctuations in biomass and community structure but no significant spatial variation was observed. The dominant taxa were Aphanocapsa sp., Ulothrix sp. and Mougeotia sp. (January), Fragilaria crotonensis, Ceratium hirundinella and Mougeotia sp. (February), Cyclotella spp. and Mougeotia sp. (March), Dinobryon spp., C. hirundinella and Mougeotia sp. (April-July), C. hirundinella and Mougeotia sp. (August), C. hirundinella, Dinobryon spp. and Mougeotia sp. (September), C. hirundinella (October), C. hirundinella, Peridinium sp. and Mougeotia sp. (November), Mougeotia sp. (December), respectively. Multivariate analyses showed that temperature and total phosphorus were significant factors in driving phytoplankton community structure, in accounting for 26.0% and 2.6% of the total variance independently with a shared portion of 3.0%. When compared to the predominance of Mougeotia sp. as surveyed in 2002-2003, there exists a significant change in phytoplankton communities with an obvious increase in algal biomass in 2015, which was likely linked to the long-term increase of lake nutrient levels.
Key words:  Lake Fuxian  phytoplankton  dominant species  community structure  environmental factors
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