气候变化领域集成服务门户(CCPortal): A highly agricultural river network in Jurong Reservoir watershed as significant CO2 and CH4 sources

CCPortal

DOI	10.1016/j.scitotenv.2020.144558
	A highly agricultural river network in Jurong Reservoir watershed as significant CO2 and CH4 sources
	Xiao Q.; Hu Z.; Hu C.; Islam A.R.M.T.; Bian H.; Chen S.; Liu C.; Lee X.
发表日期	2021
ISSN	489697
卷号	769
英文摘要	Freshwaters are receiving growing concerns on atmospheric carbon dioxide (CO2) and methane (CH4) budget; however, little is known about the anthropogenic sources of CO2 and CH4 from river network in agricultural-dominated watersheds. Here, we chose such a typical watershed and measured surface dissolved CO2 and CH4 concentrations over 2 years (2015–2017) in Jurong Reservoir watershed for different freshwater types (river network, ponds, reservoir, and ditches), which located in Eastern China and were impacted by agriculture with high fertilizer N application. Results showed that significantly higher gas concentrations occurred in river network (CO2: 112 ± 36 μmol L−1; CH4: 509 ± 341 nmol L−1) with high nutrient concentrations. Dissolved CO2 and CH4 concentrations were supersaturated in all of the freshwater types with peak saturation ratios generally occurring in river network. Temporal variations in the gas saturations were positively correlated with water temperature. The saturations of CO2 and CH4 were positively correlated with each other in river network, and both of these saturations were also positively correlated with nutrient loadings, and negatively correlated with dissolved oxygen concentration. The highly agricultural river network acted as significant CO2 and CH4 sources with estimated emission fluxes of 409 ± 369 mmol m−2 d−1 for CO2 and 1.6 ± 1.2 mmol m−2 d−1 for CH4, and made a disproportionately large, relative to the area, contribution to the total aquatic carbon emission of the watershed. Our results suggested the aquatic carbon emissions accounted for 6% of the watershed carbon budget, and fertilizer N and watersheds land use played a large role in the aquatic carbon emission. © 2021 Elsevier B.V.
英文关键词	Agricultural watershed; CO2 and CH4 dynamics; Emission flux; N loading; River network
scopus关键词	Agricultural robots; Agriculture; Atmospheric chemistry; Budget control; Dissolution; Dissolved oxygen; Eutrophication; Fertilizers; Land use; Nutrients; Rivers; Water; Watersheds; Anthropogenic sources; Atmospheric carbon dioxide; Dissolved oxygen concentrations; Gas concentration; Nutrient loading; Saturation ratio; Temporal variation; Water temperatures; Carbon dioxide; carbon dioxide; dissolved oxygen; fertilizer; fresh water; methane; agricultural development; atmospheric chemistry; carbon dioxide; concentration (composition); methane; nitrogen; source apportionment; watershed; agriculture; Article; carbon footprint; concentration (parameter); correlational study; nutrient concentration; nutrient loading; pond; priority journal; river; temperature measurement; water supply; water temperature; watershed; China; Jiangsu; Jurong River
来源期刊	Science of the Total Environment
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/177187
作者单位	Key Laboratory of Watershed Geographic Sciences, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, 210008, China; Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, School of Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing, 210044, China; College of Biology and the Environment, Joint Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing, 210037, China; Department of Disaster Management, Begum Rokeya University, Rangpur, 5400, Bangladesh; School of the Environment, Yale University, New Haven, CT 06511, United States
推荐引用方式 GB/T 7714	Xiao Q.,Hu Z.,Hu C.,et al. A highly agricultural river network in Jurong Reservoir watershed as significant CO2 and CH4 sources[J],2021,769.
APA	Xiao Q..,Hu Z..,Hu C..,Islam A.R.M.T..,Bian H..,...&Lee X..(2021).A highly agricultural river network in Jurong Reservoir watershed as significant CO2 and CH4 sources.Science of the Total Environment,769.
MLA	Xiao Q.,et al."A highly agricultural river network in Jurong Reservoir watershed as significant CO2 and CH4 sources".Science of the Total Environment 769(2021).