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Biodegradable dissolved organic carbon shapes bacterial community structures and co-occurrence patterns in large eutrophic Lake Taihu

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Journal of Environmental Sciences 2021年第9期33卷 205-217页

作者： Lei Zhou Yongqiang Zhou xiangming tang Yunlin Zhang Erik Jeppesen Taihu Laboratory for Lake Ecosystem Research State Key Laboratory of Lake Science and EnvironmentNanjing Institute of Geography and LimnologyChinese Academy of SciencesNanjing 210008China University of Chinese Academy of Sciences Beijing 100049China Department of Bioscience Aarhus UniversitySilkeborg 8600Denmark Sino-Danish Centre for Education and Research Beijing 100049China Limnology Laboratory Department of Biological Sciences and Centre for Ecosystem Research and ImplementationMiddle East Technical UniversityAnkara 06800Turkey Institute of Marine Sciences Middle East Technical UniversityMersinTurkey

Interactions between dissolved organic matter(DOM)and bacteria are central in the biogeochemical cycles of aquatic ecosystems;however,the relative importance of biodegradable dissolved organic carbon(BDOC)compared with other environmental variables in structuring the bacterial communities needs further ***,we investigated bacterial communities,chromophoric DOM(CDOM)characteristics and physico-chemical parameters as well as examined BDOC via bioassay incubations in large eutrophic Lake Taihu,China,to explore the importance of BDOC for shaping bacterial community structures and co-occurrence *** found that the proportion of BDOC(%BDOC)correlated significantly and positively with the DOC concentration and the index of the contribution of recent produced autochthonous CDOM(BIX).%BDOC,further correlated positively with the relative abundance of the tryptophan-like component and negatively with CDOM aromaticity,indicating that autochthonous production of protein-like CDOM was an important source of *** richness of the bacterial communities correlated negatively with%BDOC,indicating an enhanced number of species in the refractory DOC environments.%BDOC was identified as a significant stronger factor than DOC in shaping bacterial community composition and the co-occurrence network,suggesting that substrate biodegradability is more significant than DOC quantity determining the bacterial communities in a eutrophic *** factors explained a larger proportion of the variation in the conditionally rare and abundant subcommunity than for the abundant and the rare bacterial *** findings emphasize the importance of considering bacteria with different abundance patterns and DOC biodegradability when studying the interactions between DOM and bacteria in eutrophic lakes.

关键词： Biodegradable dissolved organic carbon Bacterial community Co-occurrence networks Chromophoric dissolved organic matter Habitat niche breadth

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Vertical diversity of sediment bacterial communities in two different trophic states of the eutrophic Lake Taihu, China

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Journal of Environmental Sciences 2013年第6期25卷 1186-1194页

作者： Keqiang Shao Guang Gao Yongping Wang xiangming tang Boqiang Qin State Key Laboratory of Lake Science and Environment Nanjing Institute of Geography and LimnologyChinese Academy of Sciences Nanjing Institute of Hydraulic Research

Vertical diversity of sediment bacterial communities in 2 different trophic states （macrophyte-dominated and algae-dominated） of the large shallow eutrophic Lake Taihu, China, were investigated using denaturing gradient gel electropfioresis （DGGE） and 16S rRNA sequence analysis. Clustering analysis of DGGE profiles showed that different clusters were recognized in different depths of sediment cores in the 2 lake trophic states. Analyses of the bacterial diversity, as estimated by the Shannon index （H＇）, showed that different sediment layers of the macrophyte-dominated state had higher diversity than the algae-dominated state. In addition, bacterial diversity of the sediment in the macrophyte-dominated state changed abruptly throughout the layers, but bacterial diversity of the algae-dominated state decreased gradually with sediment depth. Phylogenetic analysis showed that Proteobacteria was the most abundant phylum in the middle sediment of the 2 lake trophic states. In the macrophyte-dominated state, clone sequences related to Betaproteobacteria （50.0%） were the most abundant, followed by Epsilonproteobacteria （21.1%）, Acidobacteria （7.9%）, Deltaproteobacteria （7.9%）, Chloroflexi （7.9%）, and Bacteroidetes （5.3%）; whereas in the algae-dominated state, sequences affiliated with Betaproteobacteria （84.4%） were predominant, followed by Deltaproteobacteria （12.5%） and Acidobacteria （3.1%）. Canonical correspondence analysis showed that organic matter and pH play key roles in driving the vertical changes of bacterial community composition.

关键词： bacterial diversity canonical correspondence analysis (CCA) denaturing gradient gel electrophoresis (DGGE) sedimentcore macrophyte- and algae-dominated states 16S rRNA

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Phytoplankton community from Lake Taihu,China,has dissimilar responses to inorganic and organic nutrients

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Journal of Environmental Sciences 2010年第10期22卷 1491-1499页

作者： Xiaodong Wang Boqiang Qin Guang Gao Yongping Wang xiangming tang Timothy Otten State Key Laboratory of Lake Science and Environment Nanjing Institute of Geography and Limnology Chinese Academy of Sciences Nanjing 210008 China. Graduate School of the Chinese Academy of Sciences Beijing 100039 China Department of Environmental Sciences and Engineering University of North Carolina Chapel Hill NC 27517 USA

To evaluate the response of phytoplankton from Lake Taihu to different types of nutrients, the phytoplankton responses were measured after adding inorganic nitrogen （N） and phosphorus （P） or decomposed algal scum （Microcystis spp.） into the lake water. Both types of nutrients promoted an increase in phytoplankton biomass as determined by chlorophyll a and algal wet weight. The addition of decomposed algal scum resulted in a significantly greater phytoplankton response than the addition of inorganic N and P alone. The dissolved inorganic N and P in the inorganic nutrient treatment were found not limit phytoplankton growth. The higher algal biomass obtained in the treatment with decomposed algal scum indicated the importance of other organic nutrients besides N and P such as trace elements, as well as the importance of the form of N since the levels of ammonia nitrogen （NH4^＋-N） from the decomposed algal treatment were actually higher than that of the inorganic N and P addition. Microcystis spp. （Cyanobacteria）, Scenedesmus spp. （Chlorophyta） and Synechocystis spp. （Cyanobacteria） were the dominant taxa in the control, inorganic N and P treatment, and the decomposed algal scum treatment, respectively. Microcystis never bloomed in response to both types of nutrient additions indicating that the bloom propagation is not solely related to nutrient additions, but may be related to the absence of selective grazing from zooplankton.

关键词： phytoplankton inorganic nutrients decomposed algal scum

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Metagenomic analysis of viral community in the Yangtze River expands known eukaryotic and prokaryotic virus diversity in freshwater

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Virologica Sinica 2022年第1期37卷 60-69页

作者： Juan Lu Shixing Yang Xiaodan Zhang xiangming tang Ju Zhang Xiaochun Wang Hao Wang Quan Shen Wen Zhang Department of Laboratory Medicine School of MedicineJiangsu UniversityZhenjiang212013China Department of Clinical Laboratory The Affiliated Huai'an Hospital of Xuzhou Medical UniversityHuai©an223002China Zhenjiang Center for Disease Prevention and Control Zhenjiang212000China State Key Laboratory of Lake Science and Environment Nanjing Institute of Geography and LimnologyChinese Academy of SciencesNanjing210008China

Viruses in aquatic ecosystems are characterized by extraordinary abundance and *** far,there have been limited studies focused on viral communities in river water ***,we investigated the virome of the Yangtze River Delta using viral metagenomic *** compositions of viral communities from six sampling sites were analyzed and *** using library construction and next generation sequencing,contigs and singlet reads similar to viral sequences were classified into 17 viral families,including nine dsDNA viral families,four ssDNA viral families and four RNA viral *** analysis using Friedman test suggested that there was no significant difference among the six sampling sites(P>0.05).The viromes in this study were all dominated by the order Caudovirales,and a group of Freshwater phage uvFW species were particularly prevalent among all the *** virome from Nanjing presented a unique pattern of viral community composition with a relatively high abundance of family *** analyses based on virus hallmark genes showed that the Caudovirales order and CRESS-DNA viruses presented high genetic diversity,while viruses in the Microviridae and Parvoviridae families and the Riboviria realm were relatively *** study provides the first insight into viral community composition in large river ecosystem,revealing the diversity and stability of river water virome,contributing to the proper utilization of freshwater resource.

关键词： Freshwater virome River water Viral metagenomics Virus diversity

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Lake eutrophication and its ecosystem response

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Chinese Science Bulletin 2013年第9期58卷 961-970页

作者： QIN BoQiang GAO Guang ZHU GuangWei ZHANG YunLin SONG YuZhi tang xiangming XU Hai DENG JianMing Nanjing Institute of Geography & Limnology Chinese Academy of Sciences College of Environmental Science and Engineering Nanjing University of Information Science & Technology

China is a country with many lakes,about one-third of which are freshwater mainly distributed in the middle and lower reaches of the Yangtze *** most of the lakes are mesotrophic or *** eutrophication has become one of the major ecological and environmental problems faced by lakes in China and can lead to a series of abnormal ecosystem responses,including extinction of submerged plants,frequent occurrence of cyanobacterial blooms,increased microbial biomass and productivity,decreased biodiversity,accelerated cycles,and a change in the efficient use of *** development of eutrophication,the whole lake ecosystem suffers decreased biodiversity,simplification of biotic community structure,instability of the ecosystem,and ultimately the clear-water,macrophyte-dominated ecosystem gradually shifts to a turbid-water,algae-dominated *** ecosystem succession mechanism is speculated to be caused by different nutrient utilization efficiencies of macrophytes and *** ultimate ecosystem succession trend of seriously eutrophic lakes is that a phytoplankton-dominated autotrophic lake shifts to a heterotrophic lake dominated by micro-organisms,protozoans.

关键词：湖泊生态系统湖泊富营养化生物多样性生态环境问题水体富营养化生物群落结构养分利用效率生态系统演替

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The extent and value of lymphadenectomy in the surgical treatment of gastroesophageal junction carcinoma

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The Chinese-German Journal of Clinical Oncology 2009年第8期8卷 438-442页

作者： Xijiang Zhao xiangming Liu Peng tang Peng Ren Mingquan Ma Department of Esophageal Cancer Cancer Hospital of Tianjin Medical University Tianjin 300060 China

Objective： We studied the extent and value of the lymphadenectomy in surgical treatment of carcinoma of gastroesophageal junction （GEJ）. Methods： 217 patients with GEJ who underwent surgical resection were retrospectively analyzed. The extent of lymphadenectomy was divided into 5 types （DO to D4） and the curability of operation was graded as A, B and C. Results： The patients had been treated as follows： 186 with proximal gastrectomy, 31 with total gastrectomy, 97 with a combined-visceral resection. The patients who underwent D1, D2 and D3 lymphadenectomy were respectively 158, 58 and 1. The patients who were performed with resection of grade A, B and C were 53, 107 and 57 respectively. All patients were performed with a lymphadenectomy and well registered. The lymph node metastasis occurred in 157 cases （72.4%）. The lymph node metastasis rate in the group 1, 2, 3, 4, 7, 9, 12 and 110 as well as in the pulmonary ligament group were higher than other groups. 2868 lymph nodes were removed, in which 655 （22.8%） demonstrated the existence of metastasis. The total lymph node metastatic degree in these groups was higher compared to the other groups. Conclusion： The survival rate in the D1 lymphadenectomy and D2 is similar for all patients, and there may be some differences in the 2nd and 3rd years for the DI lymphadenectomy and D2 in the stage-Ⅲb patients. The survival rate of D2 lymphadenectomy in stage Ⅲb is better than D1 and that of D2 lymphadenectomy is superior to D1 in stage-Ⅳ patients. The survival rate of grade A and B operation is much better than grade C, and the survival rate of grade A is also higher than B.

关键词： gastroesophageal junction carcinoma surgical resection extent of lymphadenectomy

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气顶底水油藏注水开发影响因素——以韦8断块为例

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石油学报 2012年第2期33卷 284-287页

作者：蒋友兰田世澄唐湘明中国地质大学能源学院北京100083 中国石化江苏油田分公司江苏扬州225009

采用油藏生产动态分析和数值模拟相结合的方法,考虑到气顶底水锥进和水力压裂的实际情况,对韦8断块油藏注水开发的影响因素进行了研究。首先,在油藏描述模型的基础上建立全油藏的数值模型,应用该模型对油藏的开发生产历史进行拟合,分析... 详细信息

采用油藏生产动态分析和数值模拟相结合的方法,考虑到气顶底水锥进和水力压裂的实际情况,对韦8断块油藏注水开发的影响因素进行了研究。首先,在油藏描述模型的基础上建立全油藏的数值模型,应用该模型对油藏的开发生产历史进行拟合,分析油藏开发生产特点。并利用典型井组研究开发层系组合、水平井-直井组合井网和注水条件对开发效果的影响,通过对渗透率、原油黏度、有效厚度、井排比、穿透比、注水温度、注水速度、注采井距进行动态优化调整,得出了韦8断块开发矛盾最小化、效益最大化的合理化建议。

关键词：气顶底水油藏油藏数值模拟注水开发影响因素开发层系注水条件

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太湖藻源性颗粒物分解过程中氨基酸的变化特征

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湖泊科学 2017年第1期29卷 95-104页

作者：刘颢汤祥明高光冯胜邵克强胡洋常州大学环境与安全工程学院常州213164 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

在实验条件下研究了高浓度蓝藻堆积后水体中的藻源性颗粒物中氨基酸的分解速率、分解量和氨基酸态氮形态的变化情况.在自然光照组中,颗粒态氨基酸(PAA)的浓度从实验前的0.46 mmol/L降至实验后的0.30 mmol/L;而在无光分解组中PAA从0.44 m... 详细信息

在实验条件下研究了高浓度蓝藻堆积后水体中的藻源性颗粒物中氨基酸的分解速率、分解量和氨基酸态氮形态的变化情况.在自然光照组中,颗粒态氨基酸(PAA)的浓度从实验前的0.46 mmol/L降至实验后的0.30 mmol/L;而在无光分解组中PAA从0.44 mmol/L降至0.06 mmol/L.两种处理下PAA的降解速率常数分别为0.03916和0.17424 d^(-1).溶解态氨基酸(DAA)在分解过程中浓度比较低,随时间的变化表现出先增大后减小的趋势,在两种不同的处理下,最大值分别为10.94和7.94μmol/L,21 d后减小到与实验开始时持平,甚至低于初始值.实验初期,PAA所占比例高达74%~80%,但迅速被分解转化为DAA和铵态氮(NH_4^+-N),随着实验的进行NH_4^+-N又逐渐转化为硝态氮,其中无光分解组中的分解更为彻底,而自然光照组中PAA分解量小于无光分解组.实验结果表明,氨基酸作为水体中浮游植物的潜在氮源,可以被分解为水华过程中藻类所需的NH_4^+-N,对水华的维持具有一定的促进作用.

关键词：氨基酸分解速率氮形态光照蓝藻水华太湖

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基于大数据支持的校本作业实施研究

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成才之路 2020年第7期 36-37页

作者：汤向明福建省泉州第一中学福建泉州362000

教育大数据源于日常教育活动,作业作为教育活动的组成部分,其开发与实施过程中产生的数据是重要的数据资源。发掘、利用大数据,特别是测评大数据,是开发有特色、有针对性校本作业的有力保障,可用于预测评估校本作业的适切性和有效性。... 详细信息

教育大数据源于日常教育活动,作业作为教育活动的组成部分,其开发与实施过程中产生的数据是重要的数据资源。发掘、利用大数据,特别是测评大数据,是开发有特色、有针对性校本作业的有力保障,可用于预测评估校本作业的适切性和有效性。从技术、管理、思维等方面进行系统规划,方能促进大数据与校本作业开发的深度融合。

关键词：大数据校本作业数据素养教育信息化途径

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用FISH技术检测太湖梅梁湾水体中细菌优势种群在冬夏两季的变化

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湖泊科学 2010年第1期22卷 57-62页

作者：沈燕高光汤祥明晁建颖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 南京农业大学南京210095 中国科学院研究生院北京100049

采用FISH技术对2008年冬、夏两季太湖梅梁湾水体中细菌优势种群的丰度进行了对比分析。实验中,选取荧光素标记的特异寡核苷酸探针,与太湖梅梁湾水体中的四类细菌优势种群α-变形菌(α-proteobacteria),β-变形菌(β-proteobacteria),γ... 详细信息

采用FISH技术对2008年冬、夏两季太湖梅梁湾水体中细菌优势种群的丰度进行了对比分析。实验中,选取荧光素标记的特异寡核苷酸探针,与太湖梅梁湾水体中的四类细菌优势种群α-变形菌(α-proteobacteria),β-变形菌(β-proteobacteria),γ-变形菌(γ-proteobacteria)和拟杆菌(Bacteroidetes)进行原位杂交。结果表明:①所测定的四类细菌优势种群占总细菌的比例在冬季均显著高于夏季(P<0.01);②水体中α-proteobacteria的丰度随TP浓度的增加而显著增加(R^2=0.860,P<0.01);③随着Chl.a浓度的增加,水体中细菌的丰度呈上升的趋势,尤其是其中的γ-proteobacteria,其增大趋势更加显著(R^2=0.857,P<0.01);④细菌种群的丰度受水体中PO_4^(3-)浓度的影响,尤其是对Bacteroidetes的影响更加显著(R^2=0.733,P<0.05)。

关键词：太湖荧光原位杂交优势细菌丰度

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