DOI: 10.1029/2018GB006106
论文题名: Large-Scale Landscape Drivers of CO 2 , CH 4 , DOC, and DIC in Boreal River Networks
作者: Hutchins R.H.S. ; Prairie Y.T. ; del Giorgio P.A.
刊名: Global Biogeochemical Cycles
ISSN: 0886-6236
EISSN: 1944-9224
出版年: 2019
卷: 33, 期: 2 语种: 英语
英文关键词: Boreal Kingdom
; carbon dioxide
; dissolved inorganic carbon
; dissolved organic carbon
; environmental factor
; landscape
; methane
; remote sensing
; river
; soil organic matter
; stream
; Canada
; Quebec [Canada]
学科: carbon dioxide (CO 2 )
; dissolved organic carbon (DOC)
; fluvial networks
; landscape drivers
; methane (CH 4 )
; streams and rivers
中文摘要: The boreal biome is characterized by extremely dense and complex fluvial networks that are closely coupled to land. Reconstructing the role that these fluvial networks play in regional carbon (C) budgets requires identifying landscape and environmental drivers of riverine C that operate at the whole network scale and that can be applied across landscapes. Here we explore drivers of CO 2 , CH 4 , and dissolved organic (DOC) and inorganic C (DIC) across 190 streams and rivers spanning 8 Strahler orders over an area of 500,000 km 2 of heterogeneous boreal landscape in Québec, focusing on those drivers that can be readily obtained from remote sensing data. Each C species (except DIC) could be modeled as a function of a proximal network-scale property, such as flow distance or elevation, but adding regional structure to these models greatly improved predictions. These modeled regional effects were similar for DOC, CO 2 , and CH 4 and were strongly related to average regional soil organic content and especially to NPP, the latter integrating regional differences in climate and other environmental factors. These results suggest that there may be regional C baselines determined by a combination of landscape and climate features, which simultaneously influence the average CO 2 , DOC, and CH 4 within fluvial networks, albeit through different underlying mechanisms and with varying degrees of influence on each C species. The latter two C species appear to be more sensitive to regional differences in soil, NPP, and climate than CO 2 or DIC, and therefore more likely to shift under future scenarios of change in northern landscapes. ©2019. 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/160153
Appears in Collections: 气候变化与战略
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作者单位: Groupe de Recherche Interuniversitaire en Limnologie, (GRIL), Département des Sciences Biologiques, Université du Québec à Montréal, Montréal, Québec, Canada; Now at Department of Biological Sciences, University of Alberta, Edmonton, AlbertaCanada, Afghanistan
Recommended Citation:
Hutchins R.H.S.,Prairie Y.T.,del Giorgio P.A.. Large-Scale Landscape Drivers of CO 2 , CH 4 , DOC, and DIC in Boreal River Networks[J]. Global Biogeochemical Cycles,2019-01-01,33(2)