14C evidence that millennial and fast-cycling soil carbon are equally sensitive to warming
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 o...
Published in: | Nature Climate Change |
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Online Access: | https://escholarship.org/uc/item/7p2373jq https://escholarship.org/content/qt7p2373jq/qt7p2373jq.pdf https://doi.org/10.1038/s41558-019-0468-y |
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ftcdlib:oai:escholarship.org:ark:/13030/qt7p2373jq 2024-09-15T17:58:16+00:00 14C evidence that millennial and fast-cycling soil carbon are equally sensitive to warming Vaughn, Lydia JS Torn, Margaret S 467 - 471 2019-06-01 application/pdf https://escholarship.org/uc/item/7p2373jq https://escholarship.org/content/qt7p2373jq/qt7p2373jq.pdf https://doi.org/10.1038/s41558-019-0468-y unknown eScholarship, University of California qt7p2373jq https://escholarship.org/uc/item/7p2373jq https://escholarship.org/content/qt7p2373jq/qt7p2373jq.pdf doi:10.1038/s41558-019-0468-y public Nature Climate Change, vol 9, iss 6 Atmospheric Sciences Physical Geography and Environmental Geoscience Environmental Science and Management article 2019 ftcdlib https://doi.org/10.1038/s41558-019-0468-y 2024-06-28T06:28:20Z 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. Article in Journal/Newspaper Barrow Alaska University of California: eScholarship Nature Climate Change 9 6 467 471 |
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Open Polar |
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University of California: eScholarship |
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ftcdlib |
language |
unknown |
topic |
Atmospheric Sciences Physical Geography and Environmental Geoscience Environmental Science and Management |
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Atmospheric Sciences Physical Geography and Environmental Geoscience Environmental Science and Management Vaughn, Lydia JS Torn, Margaret S 14C evidence that millennial and fast-cycling soil carbon are equally sensitive to warming |
topic_facet |
Atmospheric Sciences Physical Geography and Environmental Geoscience Environmental Science and Management |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Vaughn, Lydia JS Torn, Margaret S |
author_facet |
Vaughn, Lydia JS Torn, Margaret S |
author_sort |
Vaughn, Lydia JS |
title |
14C evidence that millennial and fast-cycling soil carbon are equally sensitive to warming |
title_short |
14C evidence that millennial and fast-cycling soil carbon are equally sensitive to warming |
title_full |
14C evidence that millennial and fast-cycling soil carbon are equally sensitive to warming |
title_fullStr |
14C evidence that millennial and fast-cycling soil carbon are equally sensitive to warming |
title_full_unstemmed |
14C evidence that millennial and fast-cycling soil carbon are equally sensitive to warming |
title_sort |
14c evidence that millennial and fast-cycling soil carbon are equally sensitive to warming |
publisher |
eScholarship, University of California |
publishDate |
2019 |
url |
https://escholarship.org/uc/item/7p2373jq https://escholarship.org/content/qt7p2373jq/qt7p2373jq.pdf https://doi.org/10.1038/s41558-019-0468-y |
op_coverage |
467 - 471 |
genre |
Barrow Alaska |
genre_facet |
Barrow Alaska |
op_source |
Nature Climate Change, vol 9, iss 6 |
op_relation |
qt7p2373jq https://escholarship.org/uc/item/7p2373jq https://escholarship.org/content/qt7p2373jq/qt7p2373jq.pdf doi:10.1038/s41558-019-0468-y |
op_rights |
public |
op_doi |
https://doi.org/10.1038/s41558-019-0468-y |
container_title |
Nature Climate Change |
container_volume |
9 |
container_issue |
6 |
container_start_page |
467 |
op_container_end_page |
471 |
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1810434664371847168 |