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引用本文:史小丽,范帆,张民,阳振,陈开宁.巢湖西湖心底泥蓝藻对水体蓝藻生物量的贡献.湖泊科学,2020,32(5):1446-1453. DOI:
SHI Xiaoli,FAN Fan,ZHANG Min,YANG Zhen,CHEN Kaining.The contribution of benthic cyanobacteria to the cyanobacterial biomass in water column in the center of western Lake Chaohu. J. Lake Sci.2020,32(5):1446-1453. DOI:
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巢湖西湖心底泥蓝藻对水体蓝藻生物量的贡献
史小丽1, 范帆1,2, 张民1, 阳振1, 陈开宁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:
2018年10月-2019年10月对巢湖西湖心水体浮游藻类群落结构以及水体和底泥蓝藻生物量进行了月度调查.结果表明:巢湖西湖心浮游藻类的主要优势种属为微囊藻属、席藻属、十字藻、卵形隐藻和鱼腥藻属.蓝藻优势种属在5—10月为微囊藻属,11—12月为鱼腥藻属,1—4月为席藻属.巢湖水体和底泥蓝藻生物量峰值分别出现在9月和2月,水体蓝藻的衰亡下沉会导致底泥蓝藻生物量的上升.巢湖蓝藻主要分布在水体,底泥蓝藻生物量相对较低,单位面积水柱与底泥蓝藻生物量6月的比值大于100,在11—3月相对较低,最低值小于2.底泥蓝藻主要分布在底泥表层0~2 cm.通过安装原位捕获器,监测了蓝藻在西巢湖湖心水柱和底泥中的垂直迁移过程和通量.结果表明:11月和2月蓝藻有明显从水柱向底泥迁移的过程;底泥蓝藻全年向水体的静态迁移量都很低,而动态迁移在11月和6月出现两个峰值,主要受底泥蓝藻生物量和再悬浮的影响.本研究结果表明削减巢湖西湖心底泥种源的最佳时期为10月至来年2月,但是由于底泥蓝藻生物量远远小于水柱蓝藻生物量,底泥蓝藻向水体复苏迁移的通量也较低,即使削减了底泥种源,也不能有效降低水体蓝藻生物量.
关键词:  蓝藻  巢湖  底泥种源  垂直迁移  蓝藻早期防控
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(2017ZX07603-005)、国家自然科学基金项目(31670462,41877544)和中国科学院南京地理与湖泊研究所“一三五”战略发展规划项目(NIGLAS2018GH01)联合资助.
The contribution of benthic cyanobacteria to the cyanobacterial biomass in water column in the center of western Lake Chaohu
SHI Xiaoli1, FAN Fan1,2, ZHANG Min1, YANG Zhen1, CHEN Kaining1
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:
Cyanobacterial biomass in water column and sediment were investigated from October 2018 to October 2019 in the center of western Lake Chaohu. Phytoplankton were mainly composed of Microcystis, Crucigenia, Phormidioideae, Cryptomonas and Anabaena. The dominate cyanobacterial genus were Microcystis between May and November, Anabaena between November and December, and Phormidioideae between January and April. Cyanobacterial biomass in water column peaked in September and January, and settled down afterwards, resulting in the two peaks of cyanobacterial biomass in sediment. In comparison with that in water column, cyanobacteria biomass was relatively low in sediment. The proportion of cyanobacterial biomass per unit surface between water column and sediment was more than 100 in June and was relatively low from November to March, with the lowest level being less than 2. Benthic cyanobacteria were mainly distributed on the surface sediment (0-2 cm). The monthly vertical flux of cyanobacterial biomass was monitored by using an in situ trap. Our results showed that cyanobacterial biomass settled massively from water column to sediment in November and February. Cyanobacteria tended to have upward migration from sediment to water column in November and June, caused by large cyanobacterial biomass in sediment and high turbulence. However, the active recruitment of benthic cyanobacteria was low throughout the whole year. The best period to reduce the cyanobacterial seed from sediment is from October to February. However, this might not function well to mitigate cyanobacterial bloom in summer, since cyanobacteria biomass is lower in sediment than in water column and the contribution of recruitment is small.
Key words:  Cyanobacteria  Lake Chaohu  cyanobacteria seed  vertical transfer  early algal bloom control
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