globalchange  > 气候减缓与适应
DOI: 10.1029/2017JG004311
Scopus记录号: 2-s2.0-85046544471
论文题名:
The Ephemeral Signature of Permafrost Carbon in an Arctic Fluvial Network
作者: Drake T.W.; Guillemette F.; Hemingway J.D.; Chanton J.P.; Podgorski D.C.; Zimov N.S.; Spencer R.G.M.
刊名: Journal of Geophysical Research: Biogeosciences
ISSN: 21698953
出版年: 2018
卷: 123, 期:5
起始页码: 1475
结束页码: 1485
语种: 英语
Scopus关键词: bacterium ; biodegradation ; carbon dioxide ; carbon isotope ; carbon sequestration ; dissolved organic carbon ; microbial activity ; permafrost ; respiration ; river system ; tracer ; Kolyma Basin ; Russian Federation ; Bacteria (microorganisms)
英文摘要: Arctic fluvial networks process, outgas, and transport significant quantities of terrestrial organic carbon (C), particularly dissolved organic carbon (DOC). The proportion of permafrost C in these fluxes, however, is poorly constrained. A primary obstacle to the quantification of permafrost-derived DOC is that it is rapidly respired without leaving a unique tracer of its presence. In this study, we investigated the production of bacterial respiratory carbon dioxide (CO2; measured as dissolved inorganic carbon; DIC) during maximum late-summer thaw in sites spanning a fluvial network (Kolyma Basin, Siberia) to assess whether the biodegradation of permafrost DOC could be detected by the presence of a persistent aged (14C-depleted) signature on the DIC pool. Using Keeling plot interpretation of DIC produced in bioincubations of river water, we show that bacteria respire varying sources of DOC moving downstream through the fluvial network. Respiration of permafrost (production of aged CO2) was only detected in heavily permafrost thaw influenced sites. In nonpermafrost thaw impacted sites, ambient DIC was modern (14C-enriched), but rather than precluding the respiration of permafrost OC upstream, we suggest that 14C-depleted DIC is overwhelmed by modern DIC. Investigation of dissolved organic matter composition via Fourier transform ion cyclotron resonance mass spectrometry highlighted that elevated levels of aliphatic and nitrogen-containing compounds were associated with the production of aged DIC, providing molecular-level insight as to why permafrost-derived dissolved organic matter is rapidly respired. Overall, results from this study demonstrate the difficulty of tracing inputs of a highly reactive substrate to systems with diverse organic matter sources. ©2018. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113931
Appears in Collections:气候减缓与适应

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作者单位: National High Magnetic Field Laboratory Geochemistry Group and Department of Earth, Ocean and Atmospheric Science, Florida State University, Tallahassee, FL, United States; Now at Research Center on Watershed—Aquatic Ecosystem Interactions (RIVE), University of Quebec at Trois-Rivieres, Trois-Rivieres, QC, Canada; Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA, United States; Department of Earth, Ocean and Atmospheric Science, Florida State University, Tallahassee, FL, United States; Now at Pontchartrain Institute for Environmental Sciences, Department of Chemistry, University of New Orleans, New Orleans, LA, United States; North-East Science Station, Pacific Institute of Geography Russian Academy of Sciences, Chersky, Russian Federation

Recommended Citation:
Drake T.W.,Guillemette F.,Hemingway J.D.,et al. The Ephemeral Signature of Permafrost Carbon in an Arctic Fluvial Network[J]. Journal of Geophysical Research: Biogeosciences,2018-01-01,123(5)
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