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dc.contributor.authorDing, P.
dc.contributor.authorShen, C. D.
dc.contributor.authorWang, N.
dc.contributor.authorYi, W. X.
dc.contributor.authorDing, X. F.
dc.contributor.authorFu, D. P.
dc.contributor.authorLiu, K. X.
dc.contributor.authorZhou, L. P.
dc.date.accessioned2021-02-11T21:23:30Z
dc.date.available2021-02-11T21:23:30Z
dc.date.issued2010-01-01
dc.identifier.citationDing, P., Shen, C. D., Wang, N., Yi, W. X., Ding, X. F., Fu, D. P., ... & Zhou, L. P. (2010). Turnover rate of soil organic matter and origin of soil 14CO2 in deep soil from a subtropical forest in Dinghushan Biosphere Reserve, South China. Radiocarbon, 52(3), 1422-1434.
dc.identifier.issn0033-8222
dc.identifier.doi10.1017/S0033822200046506
dc.identifier.urihttp://hdl.handle.net/10150/654376
dc.descriptionFrom the 20th International Radiocarbon Conference held in Kona, Hawaii, USA, May 31-June 3, 2009.
dc.description.abstractThis paper examines the carbon isotopes (13C, 14C) of soil organic carbon (SOC) and soil CO2 from an evergreen broadleaf forest in southern China during the rainy season. The distribution of SOC 13C, and SOC content with depth, exhibits a regular decomposition of SOC compartments with different turnover rates. Labile carbon is the main component in the topsoil (0-12 cm) and has a turnover rate between 0.1 and 0.01 yr-1. In the middle section (12-35 cm), SOC was mainly comprised of mediate carbon with turnover rates ranging between 0.01 and 0.025. Below 35 cm depth (underlayer section), the SOC turnover rate is slower than 0.001 yr-1, indicating that passive carbon is the main component of SOC in this section. The total production of humus-derived CO2 is 123.84 g C m-2 yr-1, from which 88% originated in the topsoil. The middle and underlayer sections contribute only 10% and 2% to the total humus-derived CO2 production, respectively. Soil CO2 13C varies from -24.7 to -24.0, showing a slight isotopic depth gradient. Similar to soil CO2 13C, ∆14C values, which range from 100.0 to 107.2, are obviously higher than that of atmospheric CO2 (60-70) and SOC in the middle and underlayer section, suggesting that soil CO2 in the profile most likely originates mainly from SOC decomposition in the topsoil. A model of soil CO2 ∆14C indicates that the humus-derived CO2 from the topsoil contributes about 65-78% to soil CO2 in each soil gas sampling layer. In addition, the humus-derived CO2 contributes ~81% on average to total soil CO2 in the profile, in good agreement with the field observation. The distribution and origin of soil 14CO2 imply that soil CO2 will be an important source of atmospheric 14CO2 well into the future.
dc.language.isoen
dc.publisherDepartment of Geosciences, The University of Arizona
dc.relation.urlhttp://radiocarbon.webhost.uits.arizona.edu/
dc.rightsCopyright © by the Arizona Board of Regents on behalf of the University of Arizona. All rights reserved.
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/
dc.titleTurnover Rate of Soil Organic Matter and Origin of Soil 14CO2 in Deep Soil from a Subtropical Forest in Dinghushan Biosphere Reserve, South China
dc.typeProceedings
dc.typetext
dc.identifier.journalRadiocarbon
dc.description.collectioninformationThe Radiocarbon archives are made available by Radiocarbon and the University of Arizona Libraries. Contact lbry-journals@email.arizona.edu for further information.
dc.eprint.versionFinal published version
dc.description.admin-noteMigrated from OJS platform February 2021
dc.source.volume52
dc.source.issue3
dc.source.beginpage1422
dc.source.endpage1434
refterms.dateFOA2021-02-11T21:23:30Z


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