DOI: 10.1016/j.gloplacha.2016.04.011
论文题名: Importance of soil thermal regime in terrestrial ecosystem carbon dynamics in the circumpolar north
作者: Jiang Y. ; Zhuang Q. ; Sitch S. ; O'Donnell J.A. ; Kicklighter D. ; Sokolov A. ; Melillo J.
刊名: Global and Planetary Change
ISSN: 0921-8181
出版年: 2016
卷: 142 起始页码: 28
结束页码: 40
语种: 英语
英文关键词: Active layer
; Carbon budget
; Climate warming
; Permafrost degradation
; Soil thermal regime
英文摘要: In the circumpolar north (45-90°N), permafrost plays an important role in vegetation and carbon (C) dynamics. Permafrost thawing has been accelerated by the warming climate and exerts a positive feedback to climate through increasing soil C release to the atmosphere. To evaluate the influence of permafrost on C dynamics, changes in soil temperature profiles should be considered in global C models. This study incorporates a sophisticated soil thermal model (STM) into a dynamic global vegetation model (LPJ-DGVM) to improve simulations of changes in soil temperature profiles from the ground surface to 3 m depth, and its impacts on C pools and fluxes during the 20th and 21st centuries. With cooler simulated soil temperatures during the summer, LPJ-STM estimates ~0.4 Pg C yr-1 lower present-day heterotrophic respiration but ~0.5 Pg C yr-1 higher net primary production than the original LPJ model resulting in an additional 0.8 to 1.0 Pg C yr-1 being sequestered in circumpolar ecosystems. Under a suite of projected warming scenarios, we show that the increasing active layer thickness results in the mobilization of permafrost C, which contributes to a more rapid increase in heterotrophic respiration in LPJ-STM compared to the stand-alone LPJ model. Except under the extreme warming conditions, increases in plant production due to warming and rising CO2, overwhelm the e nhanced ecosystem respiration so that both boreal forest and arctic tundra ecosystems remain a net C sink over the 21st century. This study highlights the importance of considering changes in the soil thermal regime when quantifying the C budget in the circumpolar north. © 2016 Elsevier B.V. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84967221235&doi=10.1016%2fj.gloplacha.2016.04.011&partnerID=40&md5=43dd703ff18d8402d572206cf0cafe32
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/11669
Appears in Collections: 全球变化的国际研究计划 气候变化与战略
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作者单位: Department of Earth, Atmospheric, and Planetary Sciences, Purdue University, West Lafayette, IN, United States
Recommended Citation:
Jiang Y.,Zhuang Q.,Sitch S.,et al. Importance of soil thermal regime in terrestrial ecosystem carbon dynamics in the circumpolar north[J]. Global and Planetary Change,2016-01-01,142.