DOI: 10.1111/gcb.12083
论文题名: Evasion of CO2 from streams - The dominant component of the carbon export through the aquatic conduit in a boreal landscape
作者: Wallin M.B. ; Grabs T. ; Buffam I. ; Laudon H. ; Ågren A. ; Öquist M.G. ; Bishop K.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2013
卷: 19, 期: 3 起始页码: 785
结束页码: 797
语种: 英语
英文关键词: Carbon budget
; Greenhouse gases
; Headwaters
; Inland waters
; Water-atmosphere exchange
Scopus关键词: atmosphere-hydrosphere interaction
; boreal forest
; carbon budget
; carbon dioxide
; carbon sink
; dissolved inorganic carbon
; dissolved organic carbon
; greenhouse gas
; headwater
; carbon
; carbon dioxide
; article
; chemistry
; river
; soil
; Carbon
; Carbon Dioxide
; Rivers
; Soil
英文摘要: Evasion of gaseous carbon (C) from streams is often poorly quantified in landscape C budgets. Even though the potential importance of the capillary network of streams as C conduits across the land-water-atmosphere interfaces is sometimes mentioned, low-order streams are often left out of budget estimates due to being poorly characterized in terms of gas exchange and even areal surface coverage. We show that evasion of C is greater than all the total dissolved C (both organic and inorganic) exported downstream in the waters of a boreal landscape. In this study evasion of carbon dioxide (CO2) from running waters within a 67 km2 boreal catchment was studied. During a 4 year period (2006-2009) 13 streams were sampled on 104 different occasions for dissolved inorganic carbon (DIC) and dissolved organic carbon (DOC). From a locally determined model of gas exchange properties, we estimated the daily CO2 evasion with a high-resolution (5 × 5 m) grid-based stream evasion model comprising the entire ~100 km stream network. Despite the low areal coverage of stream surface, the evasion of CO2 from the stream network constituted 53% (5.0 (±1.8) g C m-2 yr-1) of the entire stream C flux (9.6 (±2.4) g C m-2 yr-1) (lateral as DIC, DOC, and vertical as CO2). In addition, 72% of the total CO2 loss took place already in the first- and second-order streams. This study demonstrates the importance of including CO2 evasion from low-order boreal streams into landscape C budgets as it more than doubled the magnitude of the aquatic conduit for C from this landscape. Neglecting this term will consequently result in an overestimation of the terrestrial C sink strength in the boreal landscape. © 2012 Blackwell Publishing Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62511
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Earth Sciences, Air Water and Landscape Sciences, Uppsala University, Villavägen 16, SE-752 36, Uppsala, Sweden; Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences, Box 7050, Uppsala,, SE-750 07, Sweden; Department of Biological Sciences, Department of Geography, University of Cincinnati, Cincinnati, OH 45221, United States; Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, Umeå, SE-901 83, Sweden
Recommended Citation:
Wallin M.B.,Grabs T.,Buffam I.,et al. Evasion of CO2 from streams - The dominant component of the carbon export through the aquatic conduit in a boreal landscape[J]. Global Change Biology,2013-01-01,19(3)