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引用本文:周建,李胜男,王秀娟,孔繁翔,史小丽.丰水期鄱阳湖超微型浮游植物空间分布特征及其影响因子.湖泊科学,2016,28(3):537-544. DOI:10.18307/2016.0309
ZHOU Jian,LI Shengnan,WANG Xiujuan,KONG Fanxiang,SHI Xiaoli.Spatial distribution characteristics of picophytoplankton and its impact factors during wet season in Lake Poyang. J. Lake Sci.2016,28(3):537-544. DOI:10.18307/2016.0309
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丰水期鄱阳湖超微型浮游植物空间分布特征及其影响因子
周建1,2, 李胜男1,2, 王秀娟1,2, 孔繁翔1, 史小丽1
1.中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室, 南京 210008;2.中国科学院大学, 北京 100049
摘要:
2014年夏季对鄱阳湖进行采样调查,以探究超微型浮游植物在鄱阳湖中的空间分布特征及其与环境因子的关系.结果表明,丰水期鄱阳湖超微型浮游植物细胞丰度较高,平均值为1.04×108 cells/L,超微蓝藻是超微型浮游植物的优势种群,尤其在北部通江湖区,占总超微藻丰度的比例超过80%.超微藻对总浮游植物净初级生产力和生物量(以叶绿素a浓度表示)贡献率的均值分别为44%和46%.鄱阳湖超微藻在空间分布上存在差异,超微藻丰度和叶绿素a浓度在南部湖区最高,其次是北部湖区,在东部和中部湖区相对较低.北部湖区超微藻对总浮游植物净初级生产力和生物量的贡献率全湖最高,分别能达到60%和50%.相关性分析表明,营养盐对超微型浮游植物生长的作用表现不明显,超微藻对总浮游植物净初级生产力的贡献率与水体透明度呈极显著负相关,水体pH值对超微真核藻丰度有显著影响.
关键词:  超微型浮游植物  鄱阳湖  丰水期  空间分布  环境因子
DOI:10.18307/2016.0309
分类号:
基金项目:国家自然科学基金项目(31270507,31070420)资助.
Spatial distribution characteristics of picophytoplankton and its impact factors during wet season in Lake Poyang
ZHOU Jian1,2, LI Shengnan1,2, WANG Xiujuan1,2, KONG Fanxiang1, SHI Xiaoli1
1.State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P. R. China;2.University of Chinese Academy of Sciences, Beijing 100049, P. R. China
Abstract:
35 sampling sites were carried out in the summer of 2014 in Lake Poyang, to explore the spatial distribution characteristics of picophytoplankton during the wet season. The cell abundances of two groups of picophytoplankton were obtained(photosynthetic picoeukaryotes with rich chlorophyll-a and picocyanobacteria with abundant phycocyanin) by flow cytometric analysis directly, which was performed with a FACSJazz flow cytometer unit, while the hetertrophic nanoflagellate should be pre-stained by SYBR Green I dye. In addition, the relationships between the abundance, biomass and net primary production(NPP) of picophytoplankton and the related environmental factors were also considered. Our results showed that, cell abundance of picophytoplankton in Lake Poyang was high, and its average value could reach to 1.04×108 cells/L. Picocyanobacteria dominated picophytoplankton in abundance, especially in the north region of the lake(which connected with Yangtze River), where the proportion of cell abundance between picocyanobacteria and picophytoplankton was more than 80%. The average contribution of picophytoplankton to the NPP and biomass of total phytoplankton could reach to 44% and 46%, respectively. The distribution of picophytoplankton showed spatial variation in Lake Poyang. The abundance and chlorophyll-a concentration of picophytoplankton were the highest in the south region, followed by the north region, and were relatively low in the middle and the east regions. The contribution of picophytoplankton to NPP and biomass of total phytoplankton achieved the highest in the north lake area, reaching to 60% and 50%, respectively. The correlation analysis results showed that the effect of nutrients on picophytoplankton growth was not obvious in Lake Poyang during the wet season. The contribution of picophytoplankton to the NPP of total phytoplankton was negatively related to water transparency. The abundance of picocyanobacteria was significantly affected by water temperature and the density of hetertrophic nanoflagellate, whereas the abundance of picoeukaryotic phytoplankton was related to water pH value.
Key words:  Picophytoplankton  Lake Poyang  wet season  spatial distribution  environmental factors
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