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引用本文:李胜男,熊丽萍,彭华,余丽,纪雄辉.东洞庭湖浮游藻类粒级结构组成及其关键影响因子.湖泊科学,2020,32(5):1508-1518. DOI:10.18307/2020.0522
LI Shengnan,XIONG Liping,PENG Hua,YU Li,JI Xionghui.Size-structure of phytoplankton biomass and driving factors in east Lake Dongting. J. Lake Sci.2020,32(5):1508-1518. DOI:10.18307/2020.0522
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东洞庭湖浮游藻类粒级结构组成及其关键影响因子
李胜男1,2, 熊丽萍1,3, 彭华1, 余丽4, 纪雄辉1,3
1.湖南省农业科学院湖南省农业环境生态研究所, 农业部长江中游平原农业环境重点实验室, 长沙 410125;2.湖泊与环境国家重点实验室, 南京 210008;3.湖南大学研究生院隆平分院, 长沙 410125;4.安徽建筑大学环境与能源工程学院, 合肥 230601
摘要:
不同粒径大小浮游藻类的养分吸收速率、沉降特性和能流方向等都不相同,浮游藻类生物量的粒级组成变化对湖泊生态系统的结构与功能具有重要影响.为了解通江湖泊浮游藻类粒级组成演替规律及其驱动机制,于2018年9月—2019年9月对东洞庭湖进行了年度采样调查,研究了不同粒级浮游藻类的时空分布特征及其与环境因子的关系.结果表明:东洞庭湖浮游藻类叶绿素a总浓度呈现显著的时空分布差异;季节上表现为夏季(22.43 μg/L) > 秋季(16.95 μg/L) > 春季(11.69 μg/L) > 冬季(3.28 μg/L),空间上表现为北部湖区(26.12 μg/L)>南部湖区(15.81 μg/L) > 东部行洪道(5.88 μg/L).纳微型藻(3~20 μm)是东洞庭湖浮游藻类生物量的主要贡献者,其在冬季优势度最高,为68.0%;春季开始,超微型藻(0~3 μm)的贡献量逐渐增加,到夏季达到最高值,为42.1%;粒径最大的微型藻(>20 μm)占比最低,全年平均占比16.2%.RDA限制性排序结果表明,不同粒级浮游藻类对环境因子的响应趋势相同,但适应能力不同;温度、水位、营养盐和pH等是影响东洞庭湖浮游藻类粒级结构的重要因素.
关键词:  东洞庭湖  叶绿素a  粒级结构  浮游藻类  通江湖泊
DOI:10.18307/2020.0522
分类号:
基金项目:国家自然科学基金项目(31800388,41601203)、湖南省自然科学基金项目(2019JJ50314)、湖泊与环境国家重点实验室开放基金项目(2018SKL008)和湖南省农业科技创新资金项目(2018QN34)联合资助.
Size-structure of phytoplankton biomass and driving factors in east Lake Dongting
LI Shengnan1,2, XIONG Liping1,3, PENG Hua1, YU Li4, JI Xionghui1,3
1.Key Laboratory of Agro-Environment in Midstream of Yangtze Plain, Ministry of Agriculture, Hunan Institute of Agro-Environment and Ecology, Hunan Academy of Agricultural Sciences, Changsha 410125, P. R. China;2.State Key Laboratory of Lake Science and Environment, Nanjing 210008, P. R. China;3.Longping Branch of Graduate School of Hunan University, Changsha 410125, P. R. China;4.School of Environment and Energy Engineering, Anhui Jianzhu University, Hefei 230601, P. R. China
Abstract:
Cell size is an important element determining phytoplankton physiological and ecological processes, including nutrient uptake, sinking and grazing; thus, phytoplankton size-structure plays an important role in the structure and function of lake ecosystem. To understand the succession patterns and driving factors of total chlorophyll-a and size structure of phytoplankton, field in-situ investigation was conducted from September 2018 to September 2019 in the east Lake Dongting, a Yangtze River- connected lake. The total phytoplankton chlorophyll-a biomass showed significant seasonality and spatiality. The highest concentration of total chlorophyll-a was observed in summer (22.43 μg/L), followed by autumn (16.95 μg/L), spring (11.69 μg/L) and winter (3.28 μg/L). Spatially, the total phytoplankton chlorophyll-a was highest in the north (26.12 μg/L) and lowest in the east (5.88 μg/L) of the lake. Phytoplankton was overwhelmingly dominated by nanophytoplankton (3-20 μm). The proportion of nanophytoplankton to total phytoplankton chlorophyll-a biomass was highest in winter (68.0%), whereas the proportion of picophytoplankton (0-3 μm) increased gradually in spring and peaked in summer (42.1%). The contribution of microplankton (>20 μm) to total phytoplankton chlorophyll-a biomass was lowest with a mean of 16.2% all year round. The results of redundancy analysis indicated that phytoplankton with different cell sizes showed similar responsive trends to environmental changes, while their adaptabilities were different. Temperature, water levels, nutrients and pH were the key factors explaining size-structure of phytoplankton in east Lake Dongting.
Key words:  East Lake Dongting  chlorophyll-a  size structure  phytoplankton  river-connected lake
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