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Improved lakeshore sediment microenvironment and enhanced denitrification efficiency by natural solid carbon sources

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International Journal of Sediment Research 2022年第6期37卷 823-832页

作者： Shihao Gong Oscar Omondi Donde Qijia Cai Xingqiang Wu Kezheng Song Chunbo Wang Pei Hong bangding xiao Cuicui Tian Institute of Hydrobiology Chinese Academy of Sciences University of Chinese Academy of Sciences Department of Environmental Science Egerton University School of Ecology and Environment Anhui Normal University

At present, the high level of nitrate in tailwater of wastewater treatment plants(WWTPs) has continued to cause serious environmental problems. In current study, wood chips and bark, serving as natural solid carbon source(NSCS), were applied to enhance the denitrification capacity of lakeshore sediment to remove superabundant nitrate in tailwater. The results show that NSCS had a positive effect on denitrification process for lakeshore sediment and increased the total phosphorus removal capacity by 212%-601%. Comparatively, wood chips were better in enhancing denitrification ability of lakeshore sediment for a longer time. At the 70 th day, the nitrate elimination(NEL) of the wood chip-sediment integrated system(WSIS) was 20% and 9% higher than the control system(CS) and bark-sediment integrated system(BSIS), respectively. For the WSIS, the microbial activity and the abundance of nicotinamide adenine dinucleotide(NADH) were significantly increased, and the sediment anaerobic zone was rapidly formed,which were conducive to the denitrification of the sediment. At the DNA level, both groups presented an inconsistency in the abundance of functional denitrification genes with the NEL. At the enzyme level,wood chips significantly increased the nitrate and nitrite reductase activities of the sediment, and promoted denitrification. From the perspective of microbial communities, wood chips highly promoted the abundance of norank＿f＿BIrii41 Proteobacteria and Ruminclostridum more than other denitrifying and potential denitrifying bacteria in the process of sediment denitrification enhancement.

关键词： Natural solid carbon source Sediment Denitrification Nitrate elimination

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Spatiotemporal dynamics of cell abundance,colony size and intracellular toxin concentrations of pelagic and benthic Microcystis in Lake Caohai,China

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Journal of Environmental Sciences 2019年第10期31卷 184-196页

作者： Bing Feng Chunbo Wang Xingqiang Wu Cuicui Tian Meng Zhang Yingying Tian bangding xiao Key Laboratory of Algal Biology of Chinese Academy of Sciences Institute of Hydrobiology Chinese Academy of Sciences Wuhan 430072China Jiangxi Academy of Environmental Sciences Nanchang 330039 China Henan institute of technology Henan 453003 China

Lake Caohai has experienced extensive Microcystis blooms in recent years,and to improve its water quality,the local government carried out a series of water control *** better understand the dynamics of both pelagic and benthic Microcystis and their characteristics in Lake Caohai,we conducted a 1-year investigation from December 2015to December 2016 to gain a seasonal outlook on the distribution and dynamics of cell abundance,colony size and intracellular microcystins(MCs)of *** results indicated that the Microcystis bloom occupied primarily the northeastern region and then moved gradually from lakeshore to lake *** perennial southwesterly winds and the water inflow from northeast to southwest in Lake Caohai determined the spatiotemporal distribution of pelagic *** Microcystis was mainly distributed in the northeastern region in summer,occupied the lake center in autumn and then occupied the southeastern region in winter,determined by the sedimentation of pelagic Microcystis and the death of benthic *** colonies(20-60μm)overwintered more easily in both water column and *** concentrations of intracellular toxin of benthic Microcystis were observed to be significantly higher than those of pelagic *** might be because Microcystis synthesized large amount of MCs to acclimate to an unfavorable benthic *** knowledge on the dynamics of Microcystis expands our understanding of mechanisms underpinning the formation of Microcystis blooms.

关键词： Spatiotemporal dynamics Pelagic Microcystis Benthic Microcystis Cell abundance Colony size Intracellular MCs

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Seasonal dynamics of water bloom-forming Microcystis morphospecies and the associated extracellular microcystin concentrations in large,shallow,eutrophic Dianchi Lake

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Journal of Environmental Sciences 2014年第9期26卷 1921-1929页

作者： Yanlong Wu Lin Li Nanqin Gan Lingling Zheng Haiyan Ma Kun Shan Jin Liu bangding xiao Lirong Song Key Laboratory of Algal Biology Institute of HydrobiologyChinese Academy of Sciences University of Chinese Academy of Sciences State Key Laboratory of Freshwater Ecology and Biotechnology Institute of HydrobiologyChinese Academy of Sciences

The increasing occurrence of Microcystis blooms is of great concern to public health and ecosystem due to the potential hepatotoxic microcystins （MCs） produced by these colonial cyanobacteria. In order to interpret the relationships between variations of Microcyst/s morphospedes and extracellular MC concentrations, the seasonal dynamics of phytoplankton community composition, MC concentrations, and environmental parameters were monitored monthly from August, 2009 to July, 2010. The results indicated that Microcystis dominated total phytoplankton abundance from May to December （96%--99% of total biovolume）, with toxic Microcystis viridis and non-toxic Microcystis wesenbergii dominating after July （constituting 65%- 95% of the Microcystis population）, followed by M. viridis as the sole dominant species from November to January （49%--93%）. Correlation analysis revealed that water temperature and nutrient were the most important variables accounting for the occurrence ofM. wesenbergii, while the dominance ofM. viridis was related with nitrite and nitrate. The relatively low content of MCs was explained by the association with a large proportion of M. viriclis and M. wesenbergii, small colony size of Microcystis populations, and low water temperature, pH and dissolved oxygen. The extracellular MC （mean of 0.5 ± 0.2 μg/L） of water samples analyzed by enzyme-linked immunosorbent assay （ELISA） demonstrated the low concentrations of MC in Dianchi Lake which implied the low potential risk for human health in the basin. The survey provides the first whole lake study of the occurrence and seasonal variability of Microcyst/s population and

关键词： Cyanobacterial bloomsMorphospecies Microcystis successionToxicityDianchi Lake

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Effects of organic carbon consumption on denitrifier community composition and diversity along dissolved oxygen vertical profiles in lake sediment surface

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Journal of Oceanology and Limnology 2020年第3期38卷 733-744页

作者： HONG Pei GONG Shihao WANG Chunbo SHU Yilin WU Xingqiang TIAN Cuicui Oscar Omondi DONDE CAI Pei WU Huaming xiao bangding Key Laboratory of Algal Biology of the Chinese Academy of Sciences Institute of HydrobiologyChinese Academy of SciencesWuhan 430072China University of Chinese Academy of Sciences Beijing 100049China College of Life Sciences Anhui Normal UniversityWuhu 241000China

At present,the understanding of the dynamics of denitrifiers at different dissolved oxygen(DO)layers under organic carbon consumption within the surface sediments remains *** this study,high-throughput sequencing and quantitative PCR targeting nirS gene were used to analyze the denitrifier abundance dynamics,community composition,and structure for aerobic(DO 0.5-6.9 mg/L),hypoxic-anoxic(DO 0-0.5 mg/L),and anoxic(DO 0 mg/L)layers in surface sediments under organic carbon *** on the analysis of nirS gene abundance,the values of denitrifying bacteria decreased with organic carbon consumption at different DO *** the bacterial species abundance at the genus level were compared between the high-carbon and low-carbon sediments,there was significant increase in 6 out of 36,7 out of 36 and 6 out of 36 genera respectively for the aerobic,hypoxic-anoxic and anoxic *** the other hand,14 out of 36,9 out of 36 and 15 out of 36 genera showed significant decrease in bacterial species abundance respectively for the aerobic,hypoxic-anoxic and anoxic ***,14 out of 36,20 out of 36,and 15 out of 36 genera had no change in bacterial species abundance respectively for the aerobic,hypoxic-anoxic,and anoxic *** indicates that the carbon utilization ability of different denitrifiers on each DO layers was generally different from each *** of denitrifying bacteria also presented significant differences in different DO layers between the high-and low-carbon content sediment ***,under the high-carbon and low-carbon content,the abundance of nirS gene showed a high peak within the hypoxic-anoxic regions,suggesting that this region might be the main distribution area for the denitrifying bacteria within the surface ***,community of unique denitrifiers occurred in different DO layers and the adaptive changes of the denitrifier community followed the organic carbon consumption.

关键词： eutrophic freshwater lake surface sediments dissolved oxygen profi les denitrifier organic carbon consumption

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Integrated site-specific quantification of faecal bacteria and detection of DNA markers in faecal contamination source tracking as a microbial risk tracking tool in urban Lake ecosystems

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Journal of Oceanology and Limnology 2018年第5期36卷 1629-1642页

作者： Oscar Omondi DONDE 田翠翠肖邦定 Key Laboratory of Algal Biology of Chinese Academy of Sciences-Lake Restoration Research Group Institute of HydrobiologyChinese Academy of Sciences International College University of Chinese Academy of Sciences Egerton University Department of Environmental Science

The presence of feacal-derived pathogens in water is responsible for several infectious diseases and deaths worldwide. As a solution, sources of fecal pollution in waters must be accurately assessed, properly determined and strictly controlled. However, the exercise has remained challenging due to the existing overlapping characteristics by different members of faecal coliform bacteria and the inadequacy of information pertaining to the contribution of seasonality and weather condition on tracking the possible sources of pollution. There are continued ef forts to improve the Faecal Contamination Source Tracking(FCST) techniques such as Microbial Source Tracking(MST). This study aimed to make contribution to MST by evaluating the efficacy of combining site specific quantification of faecal contamination indicator bacteria and detection of DNA markers while accounting for seasonality and weather conditions' eff ects in tracking the major sources of faecal contamination in a freshwater system(Donghu Lake, China). The results showed that the use of cyd gene in addition to lacZ and uidA genes differentiates E. coli from other closely related faecal bacteria. The use of selective media increases the pollution source tracking accuracy. BSA addition boosts PCR detection and increases FCST efficiency. Seasonality and weather variability also influence the detection limit for DNA markers.

关键词：粪便污染源海洋学发展现状微生物源

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轮叶黑藻(Hydrilla verticillata)根系泌氧对沉积物中典型铁氧化菌和铁还原菌的影响

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湖泊科学 2016年第4期28卷 835-842页

作者：田翠翠肖邦定中国科学院水生生物研究所武汉430072 中国科学院藻类生物学重点实验室武汉430072

铁作为地壳中丰度最高的氧化还原敏感元素,对湖泊沉积物的氧化还原作用具有重要的指示意义.水生植物根系泌氧在根际形成微域的氧化圈,根际是氧化、还原同时发生的生物活跃区.以轮叶黑藻(Hydrilla verticillata)为研究对象,利用微电极和... 详细信息

铁作为地壳中丰度最高的氧化还原敏感元素,对湖泊沉积物的氧化还原作用具有重要的指示意义.水生植物根系泌氧在根际形成微域的氧化圈,根际是氧化、还原同时发生的生物活跃区.以轮叶黑藻(Hydrilla verticillata)为研究对象,利用微电极和荧光定量PCR探讨根系泌氧作用对沉积物中典型铁氧化菌(嘉利翁氏菌)和典型铁还原菌(地杆菌)的影响.结果表明,轮叶黑藻生长迅速,通过根系泌氧作用影响沉积物中铁的价态和形态,是根际铁循环的重要参数,并对根际微区微生物有一定的影响.根系泌氧使根际嘉利翁氏菌和地杆菌数量增加,进一步影响根际微生物铁循环.实验结果可为微生物对根际铁循环的研究提供一定的理论基础.

关键词：轮叶黑藻根系泌氧嘉利翁氏菌地杆菌荧光定量PCR 沉积物

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黑藻根际对沉积物中氨氧化细菌和古菌的影响

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环境工程学报 2014年第10期8卷 4209-4214页

作者：李倩田翠翠肖邦定中国科学院水生生物研究所武汉430072 中国科学院大学北京100049 中国科学院藻类生物学重点实验室武汉430072

氨氧化反应对水生态系统氮循环和氮的去除有重要作用,沉水植物通过根系泌氧促进沉积物中硝化反应并对氨氧化细菌和古菌的分布产生影响。本研究以轮叶黑藻为实验对象,利用微电极研究沉积物-水界面的溶解氧变化,研究了黑藻根系对沉积物中... 详细信息

氨氧化反应对水生态系统氮循环和氮的去除有重要作用,沉水植物通过根系泌氧促进沉积物中硝化反应并对氨氧化细菌和古菌的分布产生影响。本研究以轮叶黑藻为实验对象,利用微电极研究沉积物-水界面的溶解氧变化,研究了黑藻根系对沉积物中氨氧化细菌和古菌数量的影响。结果表明,黑藻通过根系泌氧增加沉积物-水界面的溶解氧量和表层沉积物有氧层厚度,有氧层厚度增加了3 mm以上;种植黑藻后,根际沉积物中氨氧化细菌数量逐渐增加,氨氧化古菌数量前30天增加随后减少,氨氧化细菌与氨氧化古菌amoA基因拷贝数的比值由0.51增加到6.75,说明黑藻根际沉积物更适宜氨氧化细菌的生存。

关键词：黑藻沉积物氨氧化细菌氨氧化古菌 amoA

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表面活性剂在滇池水体中的生物降解

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湖泊科学 2008年第1期20卷 51-57页

作者：王智吴幸强肖邦定涂新海中国科学院水生生物研究所

利用河水衰减法研究阴离子表面活性剂(LAS)和非离子表面活性剂(NIS)在滇池水体中不同条件下的生物降解规律.结果表明:在滇池自然水体中,LAS和NIS均能生物降解,在试验时间(30d)内,L,AS的降解率达95%以上,NIS的降解率达92%以上,其降解动... 详细信息

利用河水衰减法研究阴离子表面活性剂(LAS)和非离子表面活性剂(NIS)在滇池水体中不同条件下的生物降解规律.结果表明:在滇池自然水体中,LAS和NIS均能生物降解,在试验时间(30d)内,L,AS的降解率达95%以上,NIS的降解率达92%以上,其降解动力学遵从二级动力模型.改变水温、表面活性剂初始浓度、pH值以及添加营养物质(葡萄糖或磷酸氢二钠)均对LAS和NIS的降解有一定的影响.水温对表面活性剂生物降解影响最大,当水温从20℃增至30℃时,LAS的降解速率从0.73-1增至2.10d-1,NIS降解半衰期从11.5d减至4.4d;表面活性剂初始浓度增加,降解半衰期有所增加;表面活性剂在pH 7时的降解性能略优于pH 10时的降解性能;添加葡萄糖抑制LAS和NIS的降解,而添加磷源磷酸氢二钠对其降解有一定的促进作用;曝气能促进LAS的降解,但对NIS降解的促进作用并不明显.

关键词： LAS NIS 生物降解降解动力学滇池

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天然水体中痕量微囊藻毒素的高效液相色谱测定方法优化

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分析化学 2005年第11期33卷 1577-1579页

作者：刘碧波肖邦定刘剑彤方涛刘永定中国科学院水生生物研究所中国科学院水生生物研究所武汉430072 中国科学院研究生院北京100039

以微囊藻毒素LR（MC-LR）和微囊藻毒素RR（MC-RR）为材料,主要通过调节杂质淋洗液和毒素洗脱液中甲醇、水和三氟乙酸（TFA）的配比来改变极性和PH值,对高效液相色谱（HPLC）法分析MC环境样品的方法进行了优化。结果表明,含0.1%TFA的40%... 详细信息

以微囊藻毒素LR（MC-LR）和微囊藻毒素RR（MC-RR）为材料,主要通过调节杂质淋洗液和毒素洗脱液中甲醇、水和三氟乙酸（TFA）的配比来改变极性和PH值,对高效液相色谱（HPLC）法分析MC环境样品的方法进行了优化。结果表明,含0.1%TFA的40%;5%的甲醇水溶液可以取得较好的杂质淋洗效果;含0.1%TFA的70%的甲醇水溶液可以将固相萃取柱（SPE）上的MC完全洗下。因此,建议在分析杂质较多的环境样品时,使用含0.1%TFA的40%;5%的甲醇水溶液对杂质进行淋洗,然后用含0.1%TFA的70%;00%甲醇水溶液对MC进行洗脱。

关键词：微囊藻毒素高效液相色谱天然水体

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轮叶黑藻(Hydrilla verticillata)对沉积物-水界面微观剖面理化参数的影响

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湖泊科学 2013年第5期25卷 715-722页

作者：田翠翠王纯波李倩肖邦定中国科学院水生生物研究所武汉430072 中国科学院大学北京100049

水生植物是湖泊生态系统的重要组成部分,沉积物-水界面是湖泊生态系统中营养盐循环的重要界面,因而研究水生植物对沉积物-水界面微观剖面的影响具有重要意义.本文利用轮叶黑藻作为研究对象,研究了来自于香溪河、太湖和东湖3个样点的沉... 详细信息

水生植物是湖泊生态系统的重要组成部分,沉积物-水界面是湖泊生态系统中营养盐循环的重要界面,因而研究水生植物对沉积物-水界面微观剖面的影响具有重要意义.本文利用轮叶黑藻作为研究对象,研究了来自于香溪河、太湖和东湖3个样点的沉积物及上覆水中N、P等理化性质,并利用微电极研究轮叶黑藻对3种沉积物-水界面微观剖面是否有影响.实验结果表明:轮叶黑藻生长迅速.增长率因沉积物不同而不同,有一定的耐污能力;轮叶黑藻使水体和沉积物中总氮、总磷含量减少,对水体和底泥有一定的净化作用;轮叶黑藻可使水体溶解氧升高,并使沉积物有氧层厚度增加,改变沉积物的氧化还原电位;轮叶黑藻可能改变了根际微环境中微生物的数量和种类,而使沉积物和上覆水中的pH、N2O和H2S等发生变化.

关键词：轮叶黑藻沉积物-水界面垂直剖面

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