DOI: 10.1002/2017JG004083
Scopus记录号: 2-s2.0-85042228019
论文题名: Stable Carbon Isotopes Reveal Soil-Stream DIC Linkages in Contrasting Headwater Catchments
作者: Campeau A. ; Bishop K. ; Nilsson M.B. ; Klemedtsson L. ; Laudon H. ; Leith F.I. ; Öquist M. ; Wallin M.B.
刊名: Journal of Geophysical Research: Biogeosciences
ISSN: 21698953
出版年: 2018
卷: 123, 期: 1 起始页码: 149
结束页码: 167
语种: 英语
英文关键词: carbon dioxide
; dissolved inorganic carbon
; methane
; soil
; stable C isotopes
; stream
Scopus关键词: carbon dioxide
; carbon isotope
; carbon sequestration
; catchment
; dissolved inorganic carbon
; groundwater
; headwater
; land cover
; methane
; soil
; spatial distribution
; stable isotope
; stream
英文摘要: Large CO2 evasion to the atmosphere occurs as dissolved inorganic carbon (DIC) is transported from soils to streams. While this physical process has been the focus of multiple studies, less is known about the underlying biogeochemical transformations that accompany this transfer of C from soils to streams. Here we used patterns in stream water and groundwater δ13C-DIC values within three headwater catchments with contrasting land cover to identify the sources and processes regulating DIC during its transport. We found that although considerable CO2 evasion occurs as DIC is transported from soils to streams, there were also other processes affecting the DIC pool. Methane production and mixing of C sources, associated with different types and spatial distribution of peat-rich areas within each catchment, had a significant influence on the δ13C-DIC values in both soils and streams. These processes represent an additional control on δ13C-DIC values and the catchment-scale cycling of DIC across different northern landscape types. The results from this study demonstrate that the transport of DIC from soils to streams results in more than just rapid CO2 evasion to the atmosphere but also represents a channel of C transformation, which questions some of our current conceptualizations of C cycling at the landscape scale. ©2018. 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/114780
Appears in Collections: 气候减缓与适应
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作者单位: Department of Earth Sciences, Air Water and Landscape, Uppsala University, Uppsala, Sweden; Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences, Uppsala, Sweden; Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, Umeå, Sweden; Department of Earth Sciences, University of Gothenburg, Gothenburg, Sweden
Recommended Citation:
Campeau A.,Bishop K.,Nilsson M.B.,et al. Stable Carbon Isotopes Reveal Soil-Stream DIC Linkages in Contrasting Headwater Catchments[J]. Journal of Geophysical Research: Biogeosciences,2018-01-01,123(1)