CH4 concentrations and fluxes in a subtropical metropolitan river network: Watershed urbanization impacts and environmental controls

doi:10.1016/j.scitotenv.2017.12.054

	CH4 concentrations and fluxes in a subtropical metropolitan river network: Watershed urbanization impacts and environmental controls
	Wang, Xiaofeng 4,5; He, Yixin 2,3; Chen, Huai 2,3; Yuan, Xingzhong 1,4,5,8; Peng, Changhui 6,7; Yue, Junsheng 1,8; Zhang, Qiaoyong 1,8; Zhou, Lilei 1,8
刊名	SCIENCE OF THE TOTAL ENVIRONMENT
	2018-05-01
卷号	622-623 期号:2018 页码:1079-1089
关键词	Methane River network Land use Nutrients content Spatial and seasonal variation
ISSN号	0048-9697
DOI	10.1016/j.scitotenv.2017.12.054
产权排序	3
文献子类	Article
英文摘要	Urbanization and greenhouse gas emissions are of great global concern, especially in developing countries such as China. However, little is known about the relationship between the two. In this study, we examined the influences of the urbanization of Chongqing Municipality, which covers an area of 5494 km(2), in China, on the CH4 emissions of in its metropolitan river network. The results from 84 sampling locations showed an overall mean CH4 concentration of 0.69 +/- 1.37 mu mol.L-1 and a CH4 flux fromthe river network of 1.40 +/- 2.53mmol CH(4)m(-2)d(-1). The CH4 concentrations and fluxes presented a clear seasonal pattern, with the highest value in the spring and the lowest in the summer. Such seasonal variations were probably co-regulated by the dilution effect, temperature and supply of fresh organicmatter by algal blooms. Another important result was that the CH4 concentrations and fluxes increased with the degree of urbanization or the proportion of urban land use, being approximately 3-13 times higher in urban and suburban areas than in rural ones. The total nitrogen, dissolved oxygen (O%) and possible sewage discharge, which could affect the in situ CH4 production and exogenous CH4 input respectively, were important factors that influenced the spatial patterns of CH4 in human-dominated river networks, while the nitrogen (N) and phosphorus (P) could be good predictors of the CH4 emissions in urban watersheds. Hydrologic drivers, including bottom sediment type, flow velocity and river width, were strongly correlated with the CH4 concentrations and could also affect the spatial variance and predict the CH4 hotspots in such metropolitan river networks. With increasing urbanization, we should pay more attention to the increasing greenhouse gas emissions associated with urbanization. (c) 2017 Elsevier B. V. All rights reserved.
学科主题	Environment/ecology
URL标识	查看原文
WOS关键词	GORGES RESERVOIR REGION ; METHANE EMISSIONS ; CARBON-DIOXIDE ; NITROUS-OXIDE ; ORGANIC-CARBON ; SURFACE-WATER ; GAS-EXCHANGE ; XIANGXI BAY ; CO2 ; DYNAMICS
WOS研究方向	Environmental Sciences & Ecology
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000426349000108
内容类型	期刊论文
源URL	[http://210.75.237.14/handle/351003/30268]
专题	成都生物研究所_生态研究
通讯作者	Chen, Huai
作者单位	1.College of Resources and Environmental Science, Chongqing University, Chongqing 400030, China; 2.Zoige Peatland and Global Change Research Station, Chinese Academy of Sciences, Hongyuan 624400, China; 3.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 610041, China; 4.Wetland Science Research Center of the Upper Reaches of the Yangtze River, Chongqing Normal University, Chongqing 400047, China; 5.College of Geography and Tourism, Chongqing Normal University, Chongqing 400047, China; 6.Institut des Sciences de l'Environnement, Université du Québec à Montréal (UQAM), 201 Président-Kennedy, Montréal H2X 3Y7, Canada; 7.State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, College of Forestry, Northwest A&F University, Yangling, Shaanxi 712100, China 8.State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400030, China;
推荐引用方式 GB/T 7714	Wang, Xiaofeng,He, Yixin,Chen, Huai,et al. CH4 concentrations and fluxes in a subtropical metropolitan river network: Watershed urbanization impacts and environmental controls[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2018,622-623(2018):1079-1089.
APA	Wang, Xiaofeng.,He, Yixin.,Chen, Huai.,Yuan, Xingzhong.,Peng, Changhui.,...&Zhou, Lilei.(2018).CH4 concentrations and fluxes in a subtropical metropolitan river network: Watershed urbanization impacts and environmental controls.SCIENCE OF THE TOTAL ENVIRONMENT,622-623(2018),1079-1089.
MLA	Wang, Xiaofeng,et al."CH4 concentrations and fluxes in a subtropical metropolitan river network: Watershed urbanization impacts and environmental controls".SCIENCE OF THE TOTAL ENVIRONMENT 622-623.2018(2018):1079-1089.