气候变化领域集成服务门户(CCPortal): 14C evidence that millennial and fast-cycling soil carbon are equally sensitive to warming

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DOI	10.1038/s41558-019-0468-y
	14C evidence that millennial and fast-cycling soil carbon are equally sensitive to warming
	Vaughn L.J.S.; Torn M.S.
发表日期	2019
ISSN	1758678X
卷号	9 期号:6
英文摘要	The Arctic is expected to shift from a sink to a source of atmospheric CO2 this century due to climate-induced increases in soil carbon mineralization1. The magnitude of this effect remains uncertain, largely because temperature sensitivities of organic matter decomposition2,3 and the distribution of these temperature sensitivities across soil carbon pools4 are not well understood. Here, a new analytical method with natural abundance radiocarbon was used to evaluate temperature sensitivities across soil carbon pools. With soils from Utqiaġvik (formerly Barrow), Alaska, an incubation experiment was used to evaluate soil carbon age and decomposability, disentangle the effects of temperature and substrate depletion on carbon mineralization, and compare temperature sensitivities of fast-cycling and slow-cycling carbon. Old, historically stable carbon was shown to be vulnerable to decomposition under warming. Using radiocarbon to differentiate between slow-cycling and fast-cycling carbon, temperature sensitivity was found to be invariant among pools, with a Q10 of ~2 irrespective of native decomposition rate. These findings suggest that mechanisms other than chemical recalcitrance mediate the effect of warming on soil carbon mineralization. © 2019, The Author(s), under exclusive licence to Springer Nature Limited.
语种	英语
来源期刊	Nature Climate Change
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/124400
作者单位	Lawrence Berkeley National Laboratory, Berkeley, CA, United States; Integrative Biology, University of California, Berkeley, Berkeley, CA, United States; Energy and Resources Group, University of California, Berkeley, Berkeley, CA, United States
推荐引用方式 GB/T 7714	Vaughn L.J.S.,Torn M.S.. 14C evidence that millennial and fast-cycling soil carbon are equally sensitive to warming[J],2019,9(6).
APA	Vaughn L.J.S.,&Torn M.S..(2019).14C evidence that millennial and fast-cycling soil carbon are equally sensitive to warming.Nature Climate Change,9(6).
MLA	Vaughn L.J.S.,et al."14C evidence that millennial and fast-cycling soil carbon are equally sensitive to warming".Nature Climate Change 9.6(2019).