DOI: 10.1002/2013GB004661
Scopus记录号: 2-s2.0-84895774842
论文题名: CO2 and CH4 emissions from streams in a lake-rich landscape: Patterns, controls, and regional significance
作者: Crawford J ; T ; , Lottig N ; R ; , Stanley E ; H ; , Walker J ; F ; , Hanson P ; C ; , Finlay J ; C ; , Striegl R ; G
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2014
卷: 28, 期: 3 起始页码: 197
结束页码: 210
语种: 英语
英文关键词: carbon dioxide
; groundwater
; metabolism
; methane
; streams
; upscaling
Scopus关键词: Carbon
; Gas emissions
; Greenhouse gases
; Groundwater
; Lakes
; Metabolism
; Methane
; Physiology
; Gas source strengths
; Gas supersaturation
; Greenhouse gas balance
; Metabolism controls
; Multiple data sets
; streams
; Terrestrial environments
; Upscaling
; Carbon dioxide
; air-water interaction
; biogeochemistry
; carbon cycle
; carbon dioxide
; freshwater ecosystem
; gas transport
; greenhouse gas
; groundwater-surface water interaction
; lake water
; methane
; streamwater
; supersaturation
; terrestrial environment
; upscaling
英文摘要: Aquatic ecosystems are important components of landscape carbon budgets. In lake-rich landscapes, both lakes and streams may be important sources of carbon gases (CO2 and CH4) to the atmosphere, but the processes that control gas concentrations and emissions in these interconnected landscapes have not been adequately addressed. We use multiple data sets that vary in their spatial and temporal extent during 2001-2012 to investigate the carbon gas source strength of streams in a lake-rich landscape and to determine the contribution of lakes, metabolism, and groundwater to stream CO2 and CH4. We show that streams emit roughly the same mass of CO 2 (23.4 Gg C yr-1; 0.49 mol CO2 m-2 d-1) as lakes at a regional scale (27 Gg C yr-1) and that stream CH4 emissions (189 Mg C yr-1; 8.46 mmol CH 4 m-2 d-1) are an important component of the regional greenhouse gas balance. Gas transfer velocity variability (range = 0.34 to 13.5 m d-1) contributed to the variability of gas flux in this landscape. Groundwater inputs and in-stream metabolism control stream gas supersaturation at the landscape scale, while carbon cycling in lakes and deep groundwaters does not control downstream gas emissions. Our results indicate the need to consider connectivity of all aquatic ecosystems (lakes, streams, wetlands, and groundwater) in lake-rich landscapes and their connections with the terrestrial environment in order to understand the full nature of the carbon cycle. ©2014. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77514
Appears in Collections: 气候变化事实与影响
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作者单位: Center for Limnology, University of Wisconsin-Madison, Madison, WI, United States; U.S. Geological Survey National Research Program, Boulder, CO, United States; Trout Lake Station, Center for Limnology, Boulder Junction, WI, United States; U.S. Geological Survey Wisconsin Water Science Center, Middleton, WI, United States; Department of Ecology, Evolution, and Behavior, University of Minnesota, St. Paul, MN, United States
Recommended Citation:
Crawford J,T,, Lottig N,et al. CO2 and CH4 emissions from streams in a lake-rich landscape: Patterns, controls, and regional significance[J]. Global Biogeochemical Cycles,2014-01-01,28(3)