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Simulation of internal nitrogen release from bottom sediments in an urban lake using a nitrogen flux model

Water Science and Engineering 2023年第3期16卷 252-260页

作者： Ran Gong Hui-ya Wang Zhi-xin Hu Yi-ping Li School of Environmental Engineering Nanjing Institute of TechnologyNanjing 211167China College of Environment Hohai UniversityNanjing 210098China

Nutrient release from sediment is considered a significant source for overlying water. Given that nutrient release mechanisms in sediment are complex and difficult to simulate, traditional approaches commonly use assigned parameter values to simulate these processes. In this study, a nitrogen flux model was developed and coupled with the water quality model of an urban lake. After parameter sensitivity analyses and model calibration and validation, this model was used to simulate nitrogen exchange at the sediment–water interface in eight scenarios. The results showed that sediment acted as a buffer in the sediment–water system. It could store or release nitrogen at any time, regulate the distribution of nitrogen between sediment and the water column, and provide algae with nitrogen. The most effective way to reduce nitrogen levels in urban lakes within a short time is to reduce external nitrogen loadings. However, sediment release might continue to contribute to the water column until a new balance is achieved. Therefore, effective measures for reducing sediment nitrogen should be developed as supplementary measures. Furthermore, model parameter sensitivity should be individually examined for different research subjects.

关键词： Diagenesis Nitrogen flux model EFDC urban lake Modeling Latin hypercube sampling

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Polycyclic aromatic hydrocarbon deposition to and exchange at the air-water interface of Luhu, an urban lake in Guangzhou, China

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Acta Geochimica 2006年第S1期 189-190页

作者： Jun LI1, Gan ZHANG1, Shihua QI2, Lingli GUO1, Xianzhi PENG1 1 State Key Laboratory of Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China 2 School of Environmental Sciences, China University of Geosciences, Wuhan 430074, China

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Long-term phosphorus reduction and phytoplankton responses in an urban lake(USA)

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Water Biology and Security 2022年第1期1卷 100-109页

作者： Yuan Grund Yangdong Pan Mark Rosenkranz Eugene Foster Oregon Department of Environmental Quality OR97232USA Department of Environmental Science and Management Portland State UniversityPortlandOR97207USA lake Oswego Corporation Lake OswegoOR97034USA

Eutrophication is one of the primary factors causing harmful cyanobacteria blooms in freshwater *** study investigated the long-term changes in water quality and summer phytoplankton assemblages in Oswego lake,OR,USA,in relation to phosphorus reduction through hypolimnetic aeration and alum *** water quality and phytoplankton assemblages were sampled biweekly during the summers from 2001 to *** concentrations of total phosphorus,soluble reactive phosphorus,and total nitrogen decreased 66%,93%and 31%,respectively,in response to the hypolimnetic aeration and alum treatments since *** phytoplankton assemblages showed a 62%reduction of cyanobacteria biovolume and a shift from cyanobacteria dominance(2001–2005)to diatom and chlorophyte dominance(2006–2013).Cluster analysis identified four statistically different groups of summer phytoplankton assemblages(denoted Groups 1–4).Nonmetric multidimensional scaling analysis indicated that the four groups were associated with different water quality *** 1 occurred prior to hypolimnetic aeration and was primarily comprised of cyanobacteria,associated with water conditions of high nutrients and high primary *** 2,dominated by cyanobacteria and chlorophytes,occurred between hypolimnetic aeration and alum surface *** 3 was dominated by diatoms and occurred after alum surface *** 4 included R-strategist phytoplankton that quickly respond to environmental changes and occurred in the years following alum injection,drawdown,and inflow alum *** Group 3 and 4 were associated with reduced nutrients in the *** conclude that these lake management practices had strong effects on both production and community compositions of phytoplankton,and advocate for future studies on large-scale climate impacts on lake ecosystems and to identify corresponding best management practices.

关键词： Phosphorus reduction Phytoplankton assemblages urban lake Long-term species data Harmful algal blooms Alum application Hypolimnetic aeration

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Liver histological changes and lipid peroxidation in the amphibian Ambystoma mexicanum induced by sediment elutriates from the lake Xochimilco

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Journal of Environmental Sciences 2016年第8期28卷 156-164页

作者： Esperanza Ortiz-Ordonez Eugenia López-López Jacinto Elías Sedeno-Díaz Esther Uría Ignacio Andrés Morales María Estela Pérez Mineko Shibayama Instituto Politécnico Nacional Depto.de Formación Básica e InterdisciplinariaCICS-USTAv.de los Maestros s/n.Col.Sto Instituto Politécnico Nacional Laboratorio de Evaluación de la Salud de Ecosistemas AcuáticosENCBProl.de Carpio y Plan de Ayala s/n.Col.Sto Instituto Politécnico Nacional Coordinación Politécnica para la SustentabilidadEdificio de la Biblioteca Nacional3er PisoAv.Instituto Politécnico Nacional s/nesq.Wilfrido MassieuCol Instituto Politécnico Nacional Laboratorio de HistologíaENCBProl.de Carpio y Plan de Ayala s/n.Col.Sto Unidad de Servicio Académico Acuario BiologíaFacultad de CienciasUniversidad Autónoma de MéxicoCiudad Universitaria Laboratorio de Infectómica Centro de Investigación y de Estudios Avanzados del IPNAv.Instituto Politécnico Nacional

Lacustrine sediments accumulate pollutants that input from the lake watershed and can be released to the water column by sediment resuspension; thus, pollutants can change their bioavailability and exert adverse effects to aquatic biota. Shallow-urban lakes are particularly susceptible to receive pollutants from urban discharges and sediment resuspension. lake Xochimilco, in Mexico City, an urban-shallow lake, faces multiple problems： urban sprawl, overexploitation of aquifers, drying of springs, discharge of wastewater from treatment plants, and sediment resuspension. The aquatic biota living in this ecosystem is continuously exposed to the release of pollutants from the sediments. We assessed the risk that pollutants released from sediments from lake Xochimilco, Touristic（TZ） and Agriculture zone（AZ）, can exert on a native amphibian species of the lake（Ambystoma mexicanum） through exposure bioassays to sediment elutriates. We evaluate alterations in the amphibian by three approaches： biochemical（level of lipid peroxidation,LPO）, cellular（ultrastructure） and the liver histology of A. mexicanum and we compare them with a batch control. Additionally, we assessed heavy metals（Pb, Cd and Hg） in *** from TZ showed the highest concentrations of the metals assessed. Organisms exposed to sediment elutriates from either study sites showed higher LPO values than control organisms（p 〈 0.05）. Organisms exposed to elutriates from the TZ showed the most conspicuous damages： hepatic vasodilation of sinusoids, capillaries with erythrocytes,leukocyte infiltration and cytoplasmic vacuolation in hepatocytes. The biological responses assessed reflected the risk that faces A. mexicanum when is exposed for prolonged periods to sediment resuspension in lake Xochimilco.

关键词： Elutriates Amphibian Liver Histological alterations Ultrastructure Oxidative stress Metals urban lake

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Review of Restoration Technology and Multi-environmental Factors Analysis of West lake Ecosystem in Hangzhou City

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Journal of Northeast Agricultural University(English Edition) 2022年第3期29卷 37-47页

作者： Wang Xin Zhao Congcong Liu Yang School of Art and Design Zhejiang Sci-Tech UniversityHangzhou 310018China

The urban lake ecosystem has the characteristics of long-term,complex and comprehensive in its ecological restoration process because it is related to social and economic activities at multiple *** in Hangzhou City,China,the West lake is a national-level scenic spot and a world heritage cultural *** provides key ecosystem services for the city and has a significant impact on the urban ecological environment and the well-being of *** West lake has undergone an 1800-year governance process in history,realizing the harmonious coexistence with Hangzhou *** modern times,due to the rapid development of urbanization and industrialization,the water quality of the West lake and its freshwater ecosystem have been greatly *** 2002,Hangzhou City has achieved the overall restoration of the West lake ecosystem through a series of measures,such as water diversion projects,dredging projects,and the West lake comprehensive protection project,and the water environment and lakeshore landscape have been greatly *** study analyzed the restoration technology of the West lake ecosystem from two scales of the watershed and the site and discussed the water ecological governance system of the West lake in the past 20 *** thedata analyses of the West lake land use,vegetation,TP,TN,NH_(3)-N,COD_(Mn) and other multi-environmental factors,the results showed that the water quality,transparency and eutrophication of the West lake had been greatly *** the same time,the application of large-scale restoration methods and technologies also required long-term observation,and attention should be paid to the proliferation of alien species and the loss of heritage value,so as to further avoid potential ecological risks caused by ecological restoration.

关键词： urban lake aquatic ecosystem ecological restoration technology comprehensive environmental protection project

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Effects of Biodegradable Detergents in Morphological Parameters of Liver in Two Neotropical Fish Species(Prochilodus lineatus and Astyanax altiparanae)

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Microscopy Research 2014年第2期2卷 39-49页

作者： Bruno Fiorelini Pereira Rebeca Mamede da Silva Alves Anderson Luis Alves Jose Augusto Senhorini Rita de Cassia Gimenes de Alcantara Rocha Priscilla Hakime Scalize Dimitrius Leonardo Pitol Flavio Henrique Caetano Universidade Estadual Paulista“Julio de Mesquita Filho”-UNESP Campus de Rio Claro Sao PauloBrazil EMBRAPA PalmasBrazil ICMBio/CEPTA PirassunungaBrazil Faculdade de Odontologia de Ribeirao Preto FORP/USPRibeirao PretoBrazil

Indiscriminate disposal of residues of domestic and/or industrial origin in aquatic ecosystems resulting from urban activities causes concern about their effects on the fauna. Substances absorbed by animals, such as those cited above, are metabolized by the liver, as it is the main target organ of several pollutants and also exercises basic vital functions in the organism. For this reason the liver is used as the main and most reliable biomarker in environmental studies. Thus the objective of the present study was to identify hepatic alterations resulting from exposure to water contaminated by a few commercial brands of biodegradable detergents and their effects when present together with several other contaminants found in nature. For such, a solution of 1 ppm of biodegradable detergents and water from an urban lake were tested on two widely distributed native Brazilian fish (Astyanax altiparanae and Prochilodus lineatus). Several alterations were found on the liver, including cytoplasm vacuolization, nuclear displacement, macrophage recruitment and reduced liver glycogen, showing a degenerative process in the liver of the fish, due to the action of contaminants.

关键词： Liver Fish Detergent urban lake Pollution

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