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Soil respiration strongly offsets carbon uptake in Alaska and Northwest Canada

Cited 7 time in wos
Cited 7 time in scopus
Soil respiration strongly offsets carbon uptake in Alaska and Northwest Canada
Other Titles
알래스카와 캐나다 북서부에서의 토양 호흡과 탄소관련 분석
Watts, Jennifer D.
Natali, Susan M.
Minions, Christina
Risk, Dave
Arndt, Kyle
Zona, Donatella
Euskirchen, Eugenie S.
Rocha, Adrian, V
Sonnentag, Oliver
Helbig, Manuel
Kalhori, Aram
Oechel, Walt
Ikawa, Hiroki
Ueyama, Masahito
Suzuki, Rikie
Kobayashi, Hideki
Celis, Gerardo
Schuur, Edward A. G.
Humphreys, Elyn
Kim, Yongwon
Lee, Bang Yong
Goetz, Scott
Madani, Nima
Schiferl, Luke D.
Commane, Roisin
Kimball, John S.
Liu, Zhihua
Torn, Margaret S.
Potter, Stefano
Wang, Jonathan A.
Jorgenson, M. Torre
Xiao, Jingfeng
Li, Xing
Edgar, Colin
Environmental Sciences & EcologyMeteorology & Atmospheric Sciences
Arcticborealcarbonclimate changesoil respirationCO2ecosystem vulnerability
Issue Date
Watts, Jennifer D., et al. 2021. "Soil respiration strongly offsets carbon uptake in Alaska and Northwest Canada". ENVIRONMENTAL RESEARCH LETTERS, 16(8): 1-12.
Soil respiration (i.e. from soils and roots) provides one of the largest global fluxes of carbon dioxide (CO2) to the atmosphere and is likely to increase with warming, yet the magnitude of soil respiration from rapidly thawing Arctic-boreal regions is not well understood. To address this knowledge gap, we first compiled a new CO2 flux database for permafrost-affected tundra and boreal ecosystems in Alaska and Northwest Canada. We then used the CO2 database, multi-sensor satellite imagery, and random forest models to assess the regional magnitude of soil respiration. The flux database includes a new Soil Respiration Station network of chamber-based fluxes, and fluxes from eddy covariance towers. Our site-level data, spanning September 2016 to August 2017, revealed that the largest soil espiration emissions occurred during the summer (June?August) and that summer fluxes were higher in boreal sites (1.87 ± 0.67 g CO2?C m?2 d ?1 ) relative to tundra (0.94 ± 0.4 g CO2?C m?2 d?1). We also observed considerable emissions (boreal: 0.24 ± 0.2 g O2?C m?2 d?1 ; tundra: 0.18 ± 0.16 g CO2?C m?2 d?1) from soils during the winter (November?March) despite frozen surface conditions. Our model estimates indicated an annual region-wide loss from soil respiration of 591 ± 120 Tg CO2?C during the 2016?2017 period. Summer months contributed to 58% of the regional soil respiration, winter months contributed to 15%, and the shoulder months contributed to 27%. In total, soil respiration offset 54% of annual gross primary productivity (GPP) across the study domain. We also found that in tundra environments, transitional tundra/boreal ecotones, and in landscapes recently affected by fire, soil respiration often exceeded GPP, resulting in a net annual source of CO2 to the atmosphere. As this region continues to warm, soil respiration may increasingly offset GPP, further amplifying global climate change.
Appears in Collections  
2021-2021, Interrelationship Investigation and Comprehensive Monitoring based on Permafrost-Atmospheric Environment (21-21) / Lee, Bang Yong (PN21011)
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