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微囊藻在洱海中的垂直分布规律及其影响因素
汪 偲,侯泽英,储昭升,王鹏飞,曹 晶,杨永哲,等
作者单位E-mail
汪 偲 西安建筑科技大学环境与市政工程学院 Wangcai1993@126.com 
侯泽英 中国环境科学研究院  
储昭升 中国环境科学研究院 chuzs@craes.org.cn 
王鹏飞 中国环境科学研究院  
曹 晶 中国环境科学研究院  
杨永哲 西安建筑科技大学环境与市政工程学院  
摘要:
微囊藻在水柱中垂直迁移对其竞争营养物及形成蓝藻水华具有重要影响。采取野外监测的方法研究了2016年9-12月期间洱海北部湖心点位微囊藻生物量的垂直分布特征并分析了影响因素。结果发现,9-11月期间微囊藻生物量逐月增长并于11月达到峰值1.77 mg/L,在12月出现下降(月均值0.34 mg/L);微囊藻伪空胞体积在9、11月含量较高(52.8~113.0 μm3/cell),10、12月较低(50.9~76.1 μm3/cell);群体粒径(74~305 μm)、垂向迁移速率(4.7~14.5 m/d)和漂浮百分率(46%~96%)在9-11月逐渐增大,12月明显减小;微囊藻生物量、群体粒径、伪空胞体积垂直分布规律均表现为表层最高,中层次之,底层最低;在9-11月期间,微囊藻在洱海中呈弱分层分布,伪空胞提供的浮力作用和藻群体粒径作用大于风力扰动作用,促使微囊藻在水柱中主动迁移并聚集在水面,然而群体粒径小、垂直迁移速率慢、伪空胞体积低及风力扰动等因素减弱了其分层现象;而在12月,风力扰动对微囊藻垂直分布的影响远超过浮力及粒径的作用,微囊藻在水柱中趋于均匀分布。
关键词:  微囊藻  垂直分布  垂向迁移  伪空胞体积  藻群体粒径
DOI:
分类号:
基金项目:国家水体污染控制与治理科技重大专项 (2012ZX07105-002)
Vertical Distribution of Microcystis and its influence factors in Lake Erhai
WANG Cai,HOU Zeying,CHU Zhaosheng,WANG Pengfei,CAO Jing,YANG Yongzhe,et al
Abstract:
The vertical migration of Microcystis in the water column plays an important role on the competition for nutrients and the formation of cyanobacteria blooms. The vertical distribution characteristics of Microcystis and its influence factors were investigated through field monitoring in the central site of the northern part of Lake Erhai from September, 2016 to December, 2016. The results showed that Microcystis biomass increased steadily from September to November and Microcystis biomass reached the peak value in November (1.77 mg/L), then decreased significantly in December (average value: 0.34 mg/L). The gas vesicle volumes of Microcystis (52.8~113.0 50.9~76.1 μm3/cell) in September and November were higher than the values (50.9~76.1 50.9~76.1 μm3/cell) in October and December. The colony sizes (74~305 μm), floating rates (4.7~14.5 m/d) and percentage of floating colonies (46%~96%) increased consistently from September to November and then decreased in December. The biomass, colony size and gas vesicle volume all decreased with the increasing of water depth. From September to November, Microcystis showed a weak stratified distribution in lake Erhai and the effect of buoyancy provided by gas vesicle volumes and colony size defeated the wind turbulence. Thus Microcystis could migrate actively in the water column and accumulate on the water surface. However, the stratification of Microcystis in Lake Erhai was weakened by small colony size, slow vertical migration rate, lower gas vesicle volume and wind turbulence. In December, the impact of wind turbulence on the vertical distribution of Microcystis greatly exceeded that of buoyancy and colony size and Microcystis tended to be distributed uniformly in the water column.
Key words:  Microcystis, vertical distribution, vertical migration, gas vesicle volume, colony size