气候变化领域集成服务门户(CCPortal): The age distribution of global soil carbon inferred from radiocarbon measurements

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DOI	10.1038/s41561-020-0596-z
	The age distribution of global soil carbon inferred from radiocarbon measurements
	Shi Z.; Allison S.D.; He Y.; Levine P.A.; Hoyt A.M.; Beem-Miller J.; Zhu Q.; Wieder W.R.; Trumbore S.; Randerson J.T.
发表日期	2020
ISSN	17520894
起始页码	555
结束页码	559
卷号	13 期号:8
英文摘要	Soils contain more carbon than the atmosphere and vegetation combined. An increased flow of carbon from the atmosphere into soil pools could help mitigate anthropogenic emissions of carbon dioxide and climate change. Yet we do not know how quickly soils might respond because the age distribution of soil carbon is uncertain. Here we used 789 radiocarbon (∆14C) profiles, along with other geospatial information, to create globally gridded datasets of mineral soil ∆14C and mean age. We found that soil depth is a primary driver of ∆14C, whereas climate (for example, mean annual temperature) is a major control on the spatial pattern of ∆14C in surface soil. Integrated to a depth of 1 m, global soil carbon has a mean age of 4,830 ± 1,730 yr, with older carbon in deeper layers and permafrost regions. In contrast, vertically resolved land models simulate ∆14C values that imply younger carbon ages and a more rapid carbon turnover. Our data-derived estimates of older mean soil carbon age suggest that soils will accumulate less carbon than predicted by current Earth system models over the twenty-first century. Reconciling these models with the global distribution of soil radiocarbon will require a better representation of the mechanisms that control carbon persistence in soils. © 2020, The Author(s), under exclusive licence to Springer Nature Limited.
英文关键词	age structure; anthropogenic source; carbon cycle; carbon dioxide; climate change; data set; measurement method; permafrost; radiocarbon dating; soil carbon; spatial analysis; twenty first century
语种	英语
来源期刊	Nature Geoscience
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/206831
作者单位	Department of Ecology and Evolutionary Biology, University of California Irvine, Irvine, CA, United States; Department of Earth System Science, University of California Irvine, Irvine, CA, United States; Department of Biogeochemical Processes, Max-Planck-Institute for Biogeochemistry, Jena, Germany; Climate and Ecosystem Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, United States; Climate and Global Dynamics Laboratory, National Center for Atmospheric Research, Boulder, CO, United States
推荐引用方式 GB/T 7714	Shi Z.,Allison S.D.,He Y.,et al. The age distribution of global soil carbon inferred from radiocarbon measurements[J],2020,13(8).
APA	Shi Z..,Allison S.D..,He Y..,Levine P.A..,Hoyt A.M..,...&Randerson J.T..(2020).The age distribution of global soil carbon inferred from radiocarbon measurements.Nature Geoscience,13(8).
MLA	Shi Z.,et al."The age distribution of global soil carbon inferred from radiocarbon measurements".Nature Geoscience 13.8(2020).