globalchange  > 气候变化与战略
DOI: 10.1038/s41561-020-0596-z
论文题名:
The age distribution of global soil carbon inferred from radiocarbon measurements
作者: 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.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2020
卷: 13, 期:8
起始页码: 555
结束页码: 559
语种: 英语
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
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.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/169678
Appears in Collections:气候变化与战略

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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

Recommended Citation:
Shi Z.,Allison S.D.,He Y.,et al. The age distribution of global soil carbon inferred from radiocarbon measurements[J]. Nature Geoscience,2020-01-01,13(8)
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