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Microbial degradation and preliminary chemical characterization of Microcystis exopolysaccharides from a cyanobacterial water bloom of Lake Taihu

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Microbial degradation and preliminary chemical characterizat...

How do inundation provoke the release of phosphorus in soil-originated sediment due to nitrogen reduction after reclaiming lake from polder

庆祝中国藻类学会成立30周年暨第十五次学术讨论会

作者： LI Pengfu~(1,*),cai yuanfeng~1,SHI Limei~1,GENG Lanfang~(1,3),XING Peng~2,yu Yang~2,KONG Fanxiang~(2,*),WANG yujiong~3 1 School of Life Sciences,nanjing University,nanjing 210093,P.R.china 2 State Key Laboratory of Lake Science and Environment,nanjing institute of geography and limnology,Chinese Academy of Sciences,73 East Beijing Road, nanjing 21.008,P.R.china 3 College of Life Sciences,Ningxia University,Yinchuan 750021,P.R.china

＜正＞The bloom biomass composed mainly of Microcystis *** harvested from Lake Taihu,***（FEPS,exopolysaccharides from filed-grown Microcystis spp.） were extracted from the bloom mass with 3%*** contained 5.4%protein...

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Journal of Environmental Sciences 2022年第8期34卷 147-157页

作者： Hezhong yuan Bingchan Jia JuanWu Haixiang Wang Jianghua yu Yiwei cai Enfeng liu Qiang Li Qingfei Zeng Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control and Collaborative Innovation Center of Atmospheric Environment and Equipment Technology(CICAEET) School of Environmental Science and EngineeringNanjing University of Information Science and TechnologyNanjing 210044China State Key Laboratory of Lake Science and Environment Nanjing Institute of Geography and LimnologyChinese Academy of SciencesNanjing 210008China Gaochun District Water Authority Bureau Nanjing 211300China College of geography and Environment Shandong Normal UniversityJi’nan 250359China Department of Soil Science University of Wisconsin-MadisonMadison 53706USA

Different N and P fractions inmicrocosm incubation experiment was measured using highresolution in-situ Peeper and DGT techniques combining with sequential extraction *** results showed the synchronous desorption and release of PO_(4)^(3-),S^(2-)and Fe^(2+)from the solid soil-originated *** trend indicated that the significant reduction of Fe-P and SO_(4)^(2-) occurred in the pore water during the *** concentrations of PO_(4)^(3-) in the overlying water and pore water increased to more than 0.1.and 0.2 mg/L at the beginning of the incubation *** NO_(3)^(-) concentrations from more than 1.5 mg/L to less than 0.5 mg/L combining with increasing NH^(4+) concentrations from less than 1.g/L tomore than 5 mg/L suggested the remarkable NO_(3)-reduction via dissimilatory nitrate reduction to ammonia(DNRA)pathway over *** NH^(4+) concentrations in the pore water aggravated the release of Fe^(2+) through reduction of Fe(Ⅲ)-P as electric acceptors under anaerobic *** process further stimulated the remarkable releasing of labile PO_(4)^(3-) from the solid phase to the solution and potential diffusion into overlying ***,high S^(2-) concentration at deeper layer indicated the reduction and releasing of S^(2-)from oxidation states,which can stimulated the NO_(3)^(-)reduction and the accumulation of NH^(4+)in the pore *** process can also provoke the reduction of Fe-P as electric acceptors following the release of labile PO_(4)^(3-)into pore ***,inundation potentially facilitate the desorption of labile P and attention should be paid during the reclaiming lake from polder.

关键词： Reclaiming lake from polder P release NO3-reduction Fe2+ Microcosmic incubation Experiment Peeper and DGT Peeper and DGT

Atrazine Adsorption Behavior on a Fluvo-Aquic Soil as Influenced by Contact Periods

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Pedosphere 2007年第6期17卷 786-791页

作者： DENG Jian-cai JIANG Xin LU Xin {1. Gui-Fen Wang Fang ZHANG Bin State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil Science Chinese Academy of Sciences Nanjing 210008. （China）. nanjing{1. of geography and limnology Chinese Academy of Sciences Nanjing 210008 （China） Department of Food Science and Bioengineering Bengbu College Bengbu 233000 （China）

A batch experiment was performed to investigate nonequilibrium adsorption behavior of atrazine （2-chloro-4-ethylamino-6-isopropylamlno-1.3,5-triazlne） on a fluvo-aquic soil. The amount of atrazine sorbed increased with increasing adsorption contact periods. For a range of initial atrazlne concentrations, the percentage of atrazine sorbed within 24 h ranged from 24% to 77% of the observed total amount sorbed for the longest contact period; when adsorption contact periods were more than 72 h, the deviations in curves fitted using a nonlinear Freundllch equation gradually became less. The opposite trend was observed for the atrazine concentrations in solution. The effect of adsorption contact periods on atrazine adsorption behavior was evaluated by interpreting the temporal variations in linear and nonlinear Freundlich equation parameters obtained from the phase-distribution relationships. As the adsorption contact period increased, the nonlinear Freundlich capacity coefficient kf showed a significant linear increase （r^2 = 0.9063, P 〈 0.001.. However, a significant negative linear correlation was observed for the nonlinear coefficient n, a dimensionless parameter （r^2 = 0.5666, P 〈 0.05）. Furthermore, the linear distribution coefficient kd ranged from 0.38 to 1.44 and exhibited a significant linear correlation to the adsorption contact period （r^2 = 0.72, P 〈 0.01.. The parameters kf and n obtained from a time-dependent isotherm rather than the distribution coefficient kd estimated using the linear Freundlich equation were more appropriate to predict the herbicide residue in the field and thus more meaningful for environmental assessment.

关键词： adsorption contact periods atrazine fluvo-aquic soil Freundlich equation parameters

Significant loss of soil inorganic carbon at the continental scale

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National Science Review 2022年第2期9卷 13-20页

作者： Xiao-Dong Song Fei Yang Hua-Yong Wu Jing Zhang De-Cheng Li Feng liu {1.-Guo Zhao Jin-Ling Yang Bing Ju Chong-Fa cai Biao Huang Huai-{1. Long Ying Lu {1.e-{1. Sui Qiu-Bing Wang Ke-Ning Wu Feng-Rong Zhang Ming-Kui Zhang Zhou Shi Wan-Zhu Ma Gang Xin Zhi-Ping Qi Qing-Rui Chang En Ci Da-Gang {1.an Yang-Zhu Zhang Jun-Ping Bai Jia-Ying Chen Jie Chen Yin-Jun Chen {1.n-Zhong Dong Chun-Lan Han Ling Li Li-Ming liu Jian-Jun Pan Fu-Peng Song Fu-Jun Sun Deng-Feng Wang Tian-Wei Wang Xiang-Hua Wei Hong-Qi Wu Xia Zhao Qing Zhou Gan-Lin Zhang State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil Science Chinese Academy of Sciences College of Advanced Agricultural Sciences University of Chinese Academy of Sciences College of Resources and Environment Huazhong Agricultural University institute of Agricultural Resources and Regional Planning Chinese Academy of Agricultural Sciences College of Natural Resources and Environment South China Agricultural University Northeast institute of{1. and Agroecology Chinese Academy of Sciences College of Land and Environment Shenyang Agricultural University School of Land Science and Technology China University of Geosciences College of Land Science and Technology China Agricultural University College of Environmental and Resource Sciences Zhejiang University institute of Digital Agriculture Zhejiang Academy of Agricultural Sciences College of Agriculture Heilongjiang Bayi Agricultural University Tropical Crops Genetic Resources institute Chinese Academy of Tropical Agricultural Sciences College of Natural Resources and Environment Northwest A & F University College of Resources and Environment Southwest University College of Resources Sichuan Agricultural University College of Resources and Environment Hunan Agricultural University institute of Agricultural Product Quality Standard and Testing Research Tibet Academy of Agricultural and Animal Husbandry Sciences School of Agricultural Sciences Zhengzhou University institute of Agriculture Environment and Resources Research Shanxi Academy of Agricultural Sciences College of Resources and Environment Henan Agricultural University College of Resources and Environment China Agricultural University College of Resources and Environmental Sciences Nanjing Agricultural University College of Resources and Environment Shandong Agricultural University Agricultural College Guangxi University College of Grassland and Environment Science Xinjiang Agricultural University College of Geographical Science Qinghai Normal University

Widespread soil acidification due to atmospheric acid deposition and agricultural fertilization may greatly accelerate soil carbonate dissolution and ***,to date,few studies have addressed these ***,we use meta-analysis and nationwide-survey datasets to investigate changes in soil inorganic carbon(SIC) stocks in *** observe an overall decrease in SIC stocks in topsoil(0-30 cm)(1..33 g C m-2yr-1. from the 1.80 s to the 201. *** SIC stocks have decreased by～8.99±2.24%(1.37±0.37 Pg C).The average SIC losses across china(0.046 Pg C yr-1. and in cropland(0.01. Pg C yr-1. account for～1..6%-24.0% of the terrestrial C sink and 57.1. of the soil organic carbon sink in cropland,*** deposition and climate change have profound influences on SIC *** estimate that～1..1.%-1..47% of SIC stocks will be further lost by *** consumption of SIC may offset a large portion of global efforts aimed at ecosystem carbon sequestration,which emphasizes the importance of achieving a better understanding of the indirect coupling mechanisms of nitrogen and carbon cycling and of effective countermeasures to minimize SIC loss.

关键词： china soil inorganic carbon stocks global change carbonate soil acidification

太湖流域沉积物中有机氯农药空间分布特征及风险评价

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长江流域资源与环境 2019年第2期28卷 387-395页

作者：蒋豫魏永军蔡永久赵中华刘新江苏省生态环境评估中心(江苏省排污权登记与交易管理中心) 江苏南京210036 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江苏南京210008 南京林业大学生物与环境学院江苏省环境工程重点实验室江苏南京210037

为了解太湖流域表层沉积物中有机氯农药的空间分布和污染特征,采集全流域1.1.表层沉积物样品,用GC-μECD分析了20种有机氯农药的含量,并基于沉积物质量基准法对沉积物污染风险进行评价。结果表明:太湖流域沉积物中20种有机氯农药(OCPs... 详细信息

为了解太湖流域表层沉积物中有机氯农药的空间分布和污染特征,采集全流域1.1.表层沉积物样品,用GC-μECD分析了20种有机氯农药的含量,并基于沉积物质量基准法对沉积物污染风险进行评价。结果表明:太湖流域沉积物中20种有机氯农药(OCPs)的总含量介于1.. 3～96. 9 ng/g dw之间,平均值为35. 0ng/g dw,其中HCHs和DDTs是主要的检出成分,平均含量分别为1.. 1.7. 6 ng/g dw,两者含量之和占总OCPs的25. 5%～85. 5%。特征化合物指数法分析结果表明,HCHs主要来源于林丹,而且该区域仍然有新的DDT输入,并且大部分p,p’-DDT通过好氧生物降解为p,p’-DDE。沉积物质量基准法评价结果显示,γ-HCH、DDTs潜在生物毒性较大。

关键词：太湖流域沉积物有机氯农药分布特征风险评价

大型浅水湖泊中浮游细菌群落的空间格局及其驱动机制一一以太湖为例

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湖泊科学 2023年第4期35卷 1433-1442页

作者：白承荣蔡舰汤祥明高光邵克强胡洋于传宁刘京涛夏江宝孙景宽滨州学院山东省黄河三角洲生态环境重点实验室滨州256600 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 襄阳职业技术学院襄阳441050 滨州市水文中心滨州256600

浮游细菌在驱动湖泊物质循环、指示湖泊水环境质量等方面发挥重要作用,探明其在湖泊中的空间分布格局及其驱动机制,是揭示湖泊物质循环过程及水环境状况的关键。浅水湖泊具有水动力扰动强烈的生境特点,其中的浮游细菌群落空间格局的形... 详细信息

浮游细菌在驱动湖泊物质循环、指示湖泊水环境质量等方面发挥重要作用,探明其在湖泊中的空间分布格局及其驱动机制,是揭示湖泊物质循环过程及水环境状况的关键。浅水湖泊具有水动力扰动强烈的生境特点,其中的浮游细菌群落空间格局的形成机制尚未明晰。本研究以大型浅水湖泊——太湖为研究对象,通过对全湖开展系统的野外调查,结合高通量测序技术、多元统计分析方法及生态学模型构建,系统探明太湖浮游细菌的空间分布格局,并揭示格局形成的驱动机制。结果显示:(1.太湖西北部湖区(藻型湖区)与东南部湖区(草型湖区)之间浮游细菌群落结构存在显著差异,而这两个区域内各湖区间及湖心区与周边湖区间之间的浮游细菌群落结构差异不显著,太湖浮游细菌群落结构整体上呈现较弱的距离衰减规律;(2)太湖草、藻型湖区及湖心区中浮游细菌群落结构分别与叶绿素a、透明度及总悬浮物显著相关,总体上环境变量对太湖浮游细菌群落空间格局的相对贡献率大于空间变量;(3)尽管确定性过程中的异质化选择、随机过程中的非主导性过程以及扩散限制对太湖浮游细菌空间格局的形成均产生重要影响,但总体上随机过程对格局形成的相对贡献更大;(4)太湖无序风场驱动的水力混合作用导致各湖区间浮游细菌群落的随机扩散,是导致随机过程主导其中浮游细菌空间格局形成的主要原因。本研究揭示了太湖浮游细菌群落的空间格局及其驱动机制,有利于丰富对水域微生物生物地理学及水域微生物生态学理论的认识。

关键词：浅水湖泊太湖浮游细菌空间格局随机过程确定性过程

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鄱阳湖湿地土壤有机碳空间分布及其影响因素

长江流域资源与环境 2022年第4期31卷 915-926页

作者：王经波郑利林郭宇菲蔡永久王晓龙中国科学院南京地理与湖泊研究所江苏南京210008 中国科学院流域地理学重点实验室江苏南京210008 中国科学院大学北京100049 华东师范大学地理科学学院上海200241

湿地土壤有机碳是联系湿地系统内外部物质循环的重要纽带,在湿地生态系统和全球碳循环中起着重要作用。鄱阳湖作为长江中下游大型通江湖泊,其湿地系统内部的土壤有机碳的循环和转换,对于区域甚至全球的碳格局和碳平衡都具有重要意义。... 详细信息

湿地土壤有机碳是联系湿地系统内外部物质循环的重要纽带,在湿地生态系统和全球碳循环中起着重要作用。鄱阳湖作为长江中下游大型通江湖泊,其湿地系统内部的土壤有机碳的循环和转换,对于区域甚至全球的碳格局和碳平衡都具有重要意义。通过系统调查与样品采集分析,探讨了鄱阳湖土壤有机碳的空间分布格局及其与土壤性状、植被以及高程等要素的关系。结果表明:(1.鄱阳湖湿地土壤有机碳平均含量为4.38%。在主湖区中部偏北以及南部湖湾区含量较高,在北部入江通道含量最低;河口冲积洲滩和碟形湖的有机碳含量明显高于河道;(2)基于地理加权回归(GWR)模型,总氮、总磷、含水率、高程和植被归一化指数(NDVI)整体上解释了鄱阳湖湿地土壤有机碳35.28%的变化(整体R^(2)=0.35)。局部R^(2)值东南高,西北低,并且碟形湖和洲滩的局部R^(2)值明显高于河道(p1.;(3)不同因子对于有机碳的影响的强弱程度在不同区域呈现出不同特征。总氮和有机碳之间的联系在西部湖区较强,在河道以及洲滩上较强;总磷在湖区东南部和西北部均较强,在洲滩和碟形湖中影响力较强;含水率对于有机碳的影响在全湖尺度上差异较小;NDVI的影响在东部和南部较强,在洲滩和碟形湖较强;海拔在湖区东南部的影响较强,在洲滩和碟形湖中较强。

关键词：土壤有机碳分布特征影响因素鄱阳湖

太湖流域铜锈环棱螺体内重金属富集量及膳食风险评价

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长江流域资源与环境 2022年第7期31卷 1595-1604页

作者：邓可伟蒋豫李颖宋翠萍邹亮华龚志军蔡永久鲁顺保江西师范大学生命科学学院江西南昌330022 中国科学院南京地理与湖泊研究所江苏南京210008 江苏省生态环境评估中心(江苏省排污权登记与交易管理中心) 江苏南京210036 江苏省水利勘测设计研究院有限公司江苏扬州225127

对太湖流域6个水系铜锈环棱螺腹足肌肉团Cu、Zn、Pb、Cr、Cd、As、Hg富集量进行分析,运用单因子污染指数法评价其受污染程度,并分别采用平均每周/每月摄入量法和目标危害系数法(THQ)对其膳食风险进行评估,旨在为居民铜锈环棱螺消费安全... 详细信息

对太湖流域6个水系铜锈环棱螺腹足肌肉团Cu、Zn、Pb、Cr、Cd、As、Hg富集量进行分析,运用单因子污染指数法评价其受污染程度,并分别采用平均每周/每月摄入量法和目标危害系数法(THQ)对其膳食风险进行评估,旨在为居民铜锈环棱螺消费安全提供参考。结果表明,洮滆水系的Cu、Zn、Pb、Cr元素富集量平均值最高,分别为1.2.1.8、248.625、4.422、7.791.mg/kg,苕溪水系Cd、As、Hg元素富集量平均值最高,分别为0.290、2.943、0.059 mg/kg。THQ评价结果显示各水系铜锈环棱螺除了As外无单一重金属潜在健康风险,但多种重金属复合暴露的健康风险(TTHQ)结果显示各水系铜锈环棱螺重金属TTHQ值均大于1.As的贡献率均超过80%,表明居民长期食用环棱螺具有重金属复合暴露健康风险及As单一重金属潜在健康风险,重金属复合暴露风险来源于As元素的污染。五个水系潜在重金属复合暴露风险排序为:洮滆水系>苕溪水系>沿江水系>黄浦江水系>杭州湾-长江口水系。

关键词：太湖流域铜锈环棱螺重金属污染膳食风险

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骆马湖浮游植物演替规律及驱动因子

环境科学 2020年第4期41卷 1648-1656页

作者：张庆吉王业宇王金东王日昕邓建明蔡永久彭凯陈业龚志军宁波大学海洋学院宁波315832 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 江苏省骆运水利工程管理处宿迁223800

江苏骆马湖作为南水北调工程的重要调蓄湖泊,水生态系统结构变化不容忽视.为研究骆马湖浮游植物群落结构演替规律及其与环境因子的关系,于201.~201.年进行了逐月监测.研究期间骆马湖总氮、高锰酸盐指数、电导率等参数呈逐年升高趋势,氟... 详细信息

江苏骆马湖作为南水北调工程的重要调蓄湖泊,水生态系统结构变化不容忽视.为研究骆马湖浮游植物群落结构演替规律及其与环境因子的关系,于201.~201.年进行了逐月监测.研究期间骆马湖总氮、高锰酸盐指数、电导率等参数呈逐年升高趋势,氟离子浓度呈逐年下降趋势.共鉴定有浮游植物7门71.,月均生物量变化范围0.1.~5.51.g·L^-1.硅藻和绿藻为绝对优势门类,其次为甲藻及隐藻;主要优势属为针杆藻(Synedra sp.)、隐藻(Chroomonas spp.)、直链硅藻(Aulacoseira spp.)、锥囊藻(Dinobryon sp.)、栅藻(Scenedesmus spp.)、脆杆藻(Fragilaria spp.)、转板藻(Mougeotia sp.)、纤维藻(Ankistrodesmus sp.)和裸藻(Euglena spp.). 201.~201.年骆马湖浮游植物群落结构年际差异较大,其变化主要体现在浮游植物生物量的再分配,硅藻和绿藻继续保持优势外甲藻和蓝藻的优势度增加.非度量多维尺度分析显示,骆马湖浮游植物群落变化与总氮、氟离子、水温、总磷、溶解氧、pH、电导率和高锰酸盐指数等因素有关,广义可加模型同样显示总氮、氟离子浓度和水温是主导骆马湖浮游植物群落结构变化的主要因素.总氮、氟离子浓度是影响浮游植物群落年际变化的环境因子,而水温是引起浮游植物群落季节变化的主要因子.结合近几年管理部门采取的措施,浮游植物群落年际变化可能与骆马湖实行禁止采砂和拆除围网等管理修复措施有关.

关键词：浅水湖泊浮游植物群落结构营养盐非度量多维尺度分析广义可加模型