Soil organic carbon pools in the northern circumpolar permafrost region
Charles Tarnocai,Josep G. Canadell,Edward A. G. Schuur,Peter Kuhry,Galina Mazhitova,Sergei Zimov +5 more
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In this article, the authors reported a new estimate of the carbon pools in soils of the northern permafrost region, including deeper layers and pools not accounted for in previous analyses.Abstract:
of all soils in the northern permafrost region is approximately 18,782 � 10 3 km 2 ,o r approximately 16% of the global soil area. In the northern permafrost region, organic soils (peatlands) and cryoturbated permafrost-affected mineral soils have the highest mean soil organic carbon contents (32.2–69.6 kg m �2 ). Here we report a new estimate of the carbon pools in soils of the northern permafrost region, including deeper layers and pools not accounted for in previous analyses. Carbon pools were estimated to be 191.29 Pg for the 0–30 cm depth, 495.80 Pg for the 0–100 cm depth, and 1024.00 Pg for the 0–300 cm depth. Our estimate for the first meter of soil alone is about double that reported for this region in previous analyses. Carbon pools in layers deeper than 300 cm were estimated to be 407 Pg in yedoma deposits and 241 Pg in deltaic deposits. In total, the northern permafrost region contains approximately 1672 Pg of organic carbon, of which approximately 1466 Pg, or 88%, occurs in perennially frozen soils and deposits. This 1672 Pg of organic carbon would account for approximately 50% of the estimated global belowground organic carbon pool.read more
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Model behavior of arbuscular mycorrhizal fungi: predicting soil carbon dynamics under climate change1
TL;DR: This commentary argues that a more explicit incorporation of microbial mechanisms can increase the accuracy of ecosystem-scale models that inform the larger-scale Earth system models, to improve projections of global climate change.
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Grassland types and season-dependent response of ecosystem respiration to experimental warming in a permafrost region in the Tibetan Plateau
TL;DR: In this paper, Wang et al. examined how different warming levels during different seasons affected ER in Tibetan alpine meadow and swamp meadow after 6 years experimental warming, and they indicated that the magnitude of warming-induced increases in ER differed by grassland type and season, and there was strong potential for the non-growing season to serve as a positive feedback to annual carbon balance.
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Warming, shading and a moth outbreak reduce tundra carbon sink strength dramatically by changing plant cover and soil microbial activity
Mathilde Borg Dahl,Anders Priemé,Asker Daniel Brejnrod,Peter Brusvang,Magnus Lund,Josephine Nymand,Magnus Kramshøj,Helge Ro-Poulsen,Merian Skouw Haugwitz +8 more
TL;DR: The reduced plant recovery in manipulated plots following the larvae outbreak suggests that climate change may increase tundra ecosystem sensitivity to disturbances, and plant community changes mediated via reduced light and reduced water availability due to increased temperature can strongly lower the carbon sink strength of tundRA ecosystems.
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An estimated cost of lost climate regulation services caused by thawing of the Arctic cryosphere
TL;DR: This paper examines how sea ice and snow cover, as well as methane emissions due to changes in permafrost, may potentially change in the future, to year 2100, and how these changes may feed back to influence the climate.
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Heterotrophic respiration does not acclimate to continuous warming in a subtropical forest
Chuan-Sheng Wu,Naishen Liang,Liqing Sha,Xingliang Xu,Yiping Zhang,Hua-Zheng Lu,Hua-Zheng Lu,Liang Song,Qinghai Song,Youneng Xie +9 more
TL;DR: It is suggested that global warming will accelerate soil carbon efflux to the atmosphere, regulated by the change in soil water content in subtropical forests.
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