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引用本文:夏曼莉,于谨磊,何虎,关保华,陈非洲,刘正文.太湖蓝藻碎屑对水质及附着藻和水丝蚓生物量的影响.湖泊科学,2020,32(4):1050-1059. DOI:10.18307/2020.0414
XIA Manli,YU Jinlei,HE Hu,GUAN Baohua,CHEN Feizhou,LIU Zhengwen.Effects of cyanobacterial detritus on water quality and the biomass of periphyton and Limnodrilus spp. in Lake Taihu. J. Lake Sci.2020,32(4):1050-1059. DOI:10.18307/2020.0414
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太湖蓝藻碎屑对水质及附着藻和水丝蚓生物量的影响
夏曼莉1,2, 于谨磊2, 何虎2, 关保华2,3, 陈非洲2,3, 刘正文1,2,3
1.暨南大学生态学系水生生物研究所, 广州 510632;2.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;3.中国科学院大学中丹科研教育中心, 北京 100049
摘要:
富营养化是现今各国面临的主要水环境问题,其中蓝藻水华暴发是全球富营养化水体最常见的现象之一.蓝藻水华将产生大量的蓝藻碎屑,其对水质及生物的影响还尚不清楚.本研究通过向中宇宙系统添加微囊藻碎屑,分析其对水体不同形态营养盐及水生生物生物量的影响.结果表明:微囊藻碎屑加入后,水体不同形态的营养盐浓度均在短期内迅速增加,其中水体总氮和总磷平均浓度最高分别达到3.86和0.36 mg/L;浮游植物生物量(用叶绿素a表示)在前9天随营养盐浓度的升高而增加,随后逐渐下降至实验初始水平.此外,附着藻类生物量在微囊藻碎屑加入后呈逐渐下降趋势,这可能与浮游植物快速增殖引起的水体透明度下降有关.微囊藻碎屑加入后,水丝蚓生物量随微囊藻碎屑的分解持续增长,在第20天达到生物量最大值.本研究通过模拟太湖梅梁湾生态系统,探讨微囊藻碎屑对水质及水生生物生物量的影响,结果有助于进一步了解蓝藻水华对水生态系统影响的途径及机理,为富营养化湖泊管理提供理论依据.
关键词:  太湖  蓝藻水华  营养盐释放  浮游植物  附着藻  水丝蚓
DOI:10.18307/2020.0414
分类号:
基金项目:国家水体污染控制与治理科技重大专项(2017ZX07203-004)和国家自然科学基金项目(41877415)联合资助.
Effects of cyanobacterial detritus on water quality and the biomass of periphyton and Limnodrilus spp. in Lake Taihu
XIA Manli1,2, YU Jinlei2, HE Hu2, GUAN Baohua2,3, CHEN Feizhou2,3, LIU Zhengwen1,2,3
1.Department of Ecology and Institute of Hydrobiology, Jinan University, Guangzhou 510632, P. R. China;2.State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P. R. China;3.Sino-Danish Center for Education and Research, University of Chinese Academy of Sciences, Beijing 100049, P. R. China
Abstract:
Eutrophication has become a major water environmental problem all over the world, and cyanobacterial blooms are one of the most common phenomena in eutrophic lakes. Thereafter, a large amount of cyanobacterial detritus will be produced after the blooms, and the effects of these detritus on water quality and biological communities are poorly studied. A 28-day mesocosm experiment was conducted in Meiliang Bay of Lake Taihu to study the effects of cyanobacterial detritus on nutrients dynamics and the biomass of aquatic organisms. We found that the concentration of nutrients increased rapidly after addition of Microcystis detritus, with the maximum mean concentration of total nitrogen (TN) and total phosphorus (TP) up to 3.86 mg/L and 0.36 mg/L, respectively. Meanwhile, phytoplankton biomass (Chl.a) increased dramatically, after detritus addition, in the first nine days, then it gradually declined to the end of the experiment. In addition, the biomass of periphyton decreased gradually after cyanobacterial detritus addition which may be mainly due to the decreasing water transparency caused by the rapid increase of Chl.a limiting the growth of periphyton. Meanwhile, the biomass of Limnodrilus spp. increased gradually, and peaked on day 20, indicating that cyanobacterial detritus facilitates the population development of Limnodrilus spp. Our results have implications for eutrophic lake management and better understanding the effects of cyanobacterial blooms on aquatic ecosystems.
Key words:  Lake Taihu  cyanobacterial bloom  nutrient release  phytoplankton  periphyton  Tubificidae
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