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Spatial variations in CO2 fluxes in a subtropical coastal reservoir of Southeast China were related to urbanization and land-use types

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Journal of Environmental Sciences 2021年第11期33卷 206-218页

作者： Yifei Zhang Min Lyu Ping Yang Derrick Y.F.Lai Chuan Tong Guanghui Zhao Ling Li Yuhan Zhang Hong Yang Key Laboratory of Humid Subtropical Eco-geographical Process of Ministry of Education Fujian Normal UniversityFuzhou 350007China School of Geographical Sciences Fujian Normal UniversityFuzhou 350007China Key Laboratory of Wetland Ecology and Environment Northeast Institute of Geography and AgroecologyChinese Academy of SciencesChangchun 130102China School of Urban and Rural Construction Shaoyang UniversityShaoyang 422000China Department of Geography and Resource Management The Chinese University of Hong KongHong KongChina College of Environmental Science and Engineering Fujian Normal UniversityFuzhou 350007China Collaborative Innovation Center of Atmospheric Environment and Equipment Technology Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control(AEMPC)School of Environmental Science and EngineeringNanjing University of Information Science and TechnologyNanjing 210044China Department of Geography and Environmental Science University of ReadingReading RG66AB United Kingdom

carbon dioxide(CO_(2))emissions from aquatic ecosystems are important components of the global carbon cycle,yet the CO_(2)emissions from coastal reservoirs,especially in developing countries where urbanization and rapid land use change occur,are still poorly *** this study,the spatiotemporal variations in CO_(2)concentrations and fluxes were investigated in Wenwusha Reservoir located in the southeast coast of ***,the mean CO_(2)concentration and flux across the whole reservoir were 41.85±2.03μmol/L and 2.87±0.29 mmol/m2/h,respectively,and the reservoir was a consistent net CO_(2)source over the entire *** land use types and urbanization levels in the reservoir catchment significantly affected the input of exogenous carbon *** mean CO_(2)fluxwasmuch higher from waters adjacent to the urban land(5.05±0.87 mmol/m2/hr)than other land use *** with larger input of exogenous substance via sewage discharge and upstream runoff were often the hotspots of CO_(2)emission in the *** results suggested that urbanization process,agricultural activities,and large input of exogenous carbon could result in large spatial heterogeneity of CO_(2)emissions and alter the CO_(2)biogeochemical cycling in coastal *** studies should characterize the diurnal variations,microbial mechanisms,and impact of meteorological conditions on reservoir CO_(2)emissions to expand our understanding of the carbon cycle in aquatic ecosystems.

关键词： carbon dioxide fluxes Spatiotemporal dynamics Land use Urbanization Anthropogenic activities Coastal reservoir

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