DOI: 10.1007/s10533-016-0215-7
Scopus记录号: 2-s2.0-84965071567
论文题名: Redistribution of soil organic matter by permafrost disturbance in the Canadian High Arctic
作者: Grewer D.M. ; Lafrenière M.J. ; Lamoureux S.F. ; Simpson M.J.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2016
卷: 128, 期: 3 起始页码: 397
结束页码: 415
语种: 英语
英文关键词: Active layer detachments
; Cape Bounty
; Soil organic matter characterization
; Solid-state 13C nuclear magnetic resonance
; Solvent extractable biomarkers
Scopus关键词: active layer
; biomarker
; carbon isotope
; nuclear magnetic resonance
; permafrost
; physical disturbance
; soil organic matter
; soil profile
; solvent
; spatial distribution
; thawing
; watershed
; Canada
; Canadian Arctic
; Cape Bounty
; Melville Island [Queen Elizabeth Islands]
; Nunavut
; Queen Elizabeth Islands
英文摘要: With increased warming in the Arctic, permafrost thaw may induce localized physical disturbance of slopes. These disturbances, referred to as active layer detachments (ALDs), redistribute soil across the landscape, potentially releasing previously unavailable carbon (C). In 2007–2008, widespread ALD activity was reported at the Cape Bounty Arctic Watershed Observatory in Nunavut, Canada. Our study investigated organic matter (OM) composition in soil profiles from ALD-impacted and undisturbed areas. Solid-state 13C nuclear magnetic resonance (NMR) and solvent-extractable biomarkers were used to characterize soil OM. Throughout the disturbed upslope profile, where surface soils and vegetation had been removed, NMR revealed low O-alkyl C content and biomarker analysis revealed low concentrations of solvent-extractable compounds suggesting enhanced erosion of labile-rich OM by the ALD. In the disturbed downslope region, vegetation remained intact but displaced material from upslope produced lateral compression ridges at the surface. High O-alkyl content in the surface horizon was consistent with enrichment of carbohydrates and peptides, but low concentrations of labile biomarkers (i.e., sugars) suggested the presence of relatively unaltered labile-rich OM. Decreased O-alkyl content and biomarker concentrations below the surface contrasted with the undisturbed profile and may indicate the loss of well-established pre-ALD surface drainage with compression ridge formation. However, pre-ALD profile composition remains unknown and the observed decreases may result from nominal pre-ALD OM inputs. These results are the first to establish OM composition in ALD-impacted soil profiles, suggesting reallocation of permafrost-derived soil C to areas where degradation or erosion may contribute to increased C losses from disturbed Arctic soils. © 2016, Springer International Publishing Switzerland. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83390
Appears in Collections: 气候减缓与适应 气候变化事实与影响
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作者单位: Department of Chemistry, University of Toronto, 80 St George St, Toronto, ON, Canada; Department of Physical and Environmental Sciences, University of Toronto, 1265 Military Trail, Toronto, ON, Canada; Department of Geography and Planning, Queen’s University, 99 University Ave., Kingston, ON, Canada
Recommended Citation:
Grewer D.M.,Lafrenière M.J.,Lamoureux S.F.,et al. Redistribution of soil organic matter by permafrost disturbance in the Canadian High Arctic[J]. Biogeochemistry,2016-01-01,128(3)