DOI: 10.1111/gcb.13169
论文题名: Oxidative mitigation of aquatic methane emissions in large Amazonian rivers
作者: Sawakuchi H.O. ; Bastviken D. ; Sawakuchi A.O. ; Ward N.D. ; Borges C.D. ; Tsai S.M. ; Richey J.E. ; Ballester M.V.R. ; Krusche A.V.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2016
卷: 22, 期: 3 起始页码: 1075
结束页码: 1085
语种: 英语
英文关键词: Amazon
; CH 4
; Greenhouse gas
; Methane oxidation
; Methanotrophs
; pmoA gene
; Sink
; Tropical rivers
Scopus关键词: atmospheric sink
; biomarker
; carbon emission
; climate change
; greenhouse gas
; hydrological change
; mass balance
; methane
; methanotrophy
; oxidation
; river
; Amazon Basin
; Amazon River
; air pollutant
; bacterial protein
; biological marker
; methane
; air pollutant
; bacterium
; Brazil
; chemistry
; ecosystem
; environmental monitoring
; genetics
; metabolism
; oxidation reduction reaction
; river
; Air Pollutants
; Bacteria
; Bacterial Proteins
; Biomarkers
; Brazil
; Ecosystem
; Environmental Monitoring
; Methane
; Oxidation-Reduction
; Rivers
英文摘要: The flux of methane (CH4) from inland waters to the atmosphere has a profound impact on global atmospheric greenhouse gas (GHG) levels, and yet, strikingly little is known about the dynamics controlling sources and sinks of CH4 in the aquatic setting. Here, we examine the cycling and flux of CH4 in six large rivers in the Amazon basin, including the Amazon River. Based on stable isotopic mass balances of CH4, inputs and outputs to the water column were estimated. We determined that ecosystem methane oxidation (MOX) reduced the diffusive flux of CH4 by approximately 28-96% and varied depending on hydrologic regime and general geochemical characteristics of tributaries of the Amazon River. For example, the relative amount of MOX was maximal during high water in black and white water rivers and minimal in clear water rivers during low water. The abundance of genetic markers for methane-oxidizing bacteria (pmoA) was positively correlated with enhanced signals of oxidation, providing independent support for the detected MOX patterns. The results indicate that MOX in large Amazonian rivers can consume from 0.45 to 2.07 Tg CH4 yr-1, representing up to 7% of the estimated global soil sink. Nevertheless, climate change and changes in hydrology, for example, due to construction of dams, can alter this balance, influencing CH4 emissions to atmosphere. © 2016 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61450
Appears in Collections: 影响、适应和脆弱性
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作者单位: Center of Nuclear Energy in Agriculture, University of São Paulo, Av. Centenário, 303, Piracicaba, SP, Brazil; Department of Thematic Studies - Environmental Change, Linköping University, Linköping, Sweden; Departament of Sedimentary and Environmental Geology, Institute of Geosciences, University of São Paulo, Rua do Lago, 562, São Paulo, Brazil; Department of Geological Sciences, University of Florida, Box 112120, Gainesville, FL, United States; School of Oceanography, University of Washington, Seattle, WA, United States
Recommended Citation:
Sawakuchi H.O.,Bastviken D.,Sawakuchi A.O.,et al. Oxidative mitigation of aquatic methane emissions in large Amazonian rivers[J]. Global Change Biology,2016-01-01,22(3)