DOI: 10.1016/j.atmosenv.2017.09.043
Scopus记录号: 2-s2.0-85031508773
论文题名: Effect of watershed urbanization on N2O emissions from the Chongqing metropolitan river network, China
作者: He Y ; , Wang X ; , Chen H ; , Yuan X ; , Wu N ; , Zhang Y ; , Yue J ; , Zhang Q ; , Diao Y ; , Zhou L
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2017
卷: 171 起始页码: 70
结束页码: 81
语种: 英语
英文关键词: Emission factor
; Hydromorphology
; Nitrous oxide
; Nutrient contents
; River network
; Urbanization
Scopus关键词: Climate change
; Dissolved oxygen
; Global warming
; Nitrogen oxides
; Regression analysis
; Sewage
; Substrates
; Watersheds
; Emission factors
; Hydromorphology
; Nitrous oxide
; Nutrient contents
; River network
; Urbanization
; Rivers
; ammonia
; carbon
; dissolved oxygen
; nitrate
; nitrogen
; nitrous oxide
; phosphorus
; polyethylene
; surface water
; dissolved oxygen
; global warming
; human activity
; Intergovernmental Panel on Climate Change
; nitrogen
; nitrous oxide
; nutrient
; regression analysis
; river system
; sewage
; spatiotemporal analysis
; urbanization
; water temperature
; watershed
; Article
; China
; climate change
; exhaust gas
; greenhouse effect
; greenhouse gas
; human
; nitrogen metabolism
; priority journal
; river
; seasonal variation
; sewage effluent
; urbanization
; velocity
; water temperature
; watershed
; China
; Chongqing
Scopus学科分类: Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要: Watershed urbanization, an integrated anthropogenic perturbation, is another considerable global concern in addition to that of global warming and may significantly enrich the N loadings of watersheds, which then greatly influences the nitrous oxide (N2O) production and fluxes of these aquatic systems. However, little is known about the N2O dynamics in human-dominated metropolitan river networks. In this study, we present the temporal and spatial variations in N2O saturation and emission in the Chongqing metropolitan river network, which is undergoing intensified urbanization. The N2O saturation and fluxes at 84 sampling sites ranged from 126% to 10536% and from 4.5 to 1566.8 μmol N2O m−2 d−1, with means of 1780% and 261 μmol N2O m−2 d−1. The riverine N2O saturation and fluxes increased along with the urbanization gradient and urbanization rate, with disproportionately higher values in urban rivers due to the N2O-rich sewage inputs and enriched in situ N substrates. We found a clear seasonal pattern of N2O saturation, which was co-regulated by both water temperature and precipitation. Regression analysis indicated that the N substrates and dissolved oxygen (DO) that controlled nitrogen metabolism acted as good predictors of the N2O emissions of urban river networks. Particularly, phosphorus (P) and hydromorphological factors (water velocity, river size and bottom substrate) had stronger relationships with the N2O saturation and could also be used to predict the N2O emission hotspots in regions with rapid urbanization. In addition, the default emission factors (EF5-r) used in the Intergovernmental Panel on Climate Change (IPCC) methodology may need revision given the differences among the physical and chemical factors in different rivers, especially urban rivers. © 2017 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/82178
Appears in Collections: 气候变化事实与影响
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作者单位: Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization, Ecological Restoration Biodiversity Conservation Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, China; Zoige Peatland and Global Change Research Station, Chinese Academy of Sciences, Hongyuan, China; University of Chinese Academy of Sciences, Beijing, China; Wetland Science Research Center of the Upper Reaches of the Yangtze River, Chongqing Normal University, Chongqing, China; College of Geography and Tourism, Chongqing Normal University, Chongqing, China; State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing, China; College of Resources and Environmental Science, Chongqing University, Chongqing, China
Recommended Citation:
He Y,, Wang X,, Chen H,et al. Effect of watershed urbanization on N2O emissions from the Chongqing metropolitan river network, China[J]. Atmospheric Environment,2017-01-01,171