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dc.contributor.authorLeavitt, S. W.
dc.contributor.authorFollett, R. F.
dc.contributor.authorPaul, E. A.
dc.date.accessioned2021-02-11T20:44:27Z
dc.date.available2021-02-11T20:44:27Z
dc.date.issued1996-01-01
dc.identifier.citationLeavitt, S. W., Follett, R. F., & Paul, E. A. (1996). Estimation of slow-and fast-cycling soil organic carbon pools from 6N HCl hydrolysis. Radiocarbon, 38(2), 231-239.
dc.identifier.issn0033-8222
dc.identifier.doi10.1017/S0033822200017604
dc.identifier.urihttp://hdl.handle.net/10150/653599
dc.description.abstractAcid hydrolysis is used to fractionate the soil organic carbon pool into relatively slowand fast-cycling compartments on soils from Arizona, the Great Plains states and Michigan collected for carbon isotope tracer studies related to soil carbon sequestration, for studies of shifts in C3/C4 vegetation, and for "pre-bomb" soil-carbon inventories. Prior to hydrolysis, soil samples are first treated with cold 0.5-1N HCl to remove soil carbonates if necessary. Samples are then dispersed in a concentrated NaCI solution (p is roughly equal to 1.2 g cm-3) and floated plant fragments are skimmed off the surface. After rinsing and drying, all remaining recognizable plant fragments are picked from the soil under 20x magnification. Plant-free soils, and hot, 6N HCl acid-hydrolysis residue and hydrolyzate fractions are analyzed for carbon content, delta-13C and 14C age, and the carbon distribution is verified within 1-2% by stable-carbon isotope mass balance. On average, the recalcitrant residue fraction is 1800 yr older and 2.6 per mil more 13C-depleted than total soil organic carbon. A test of hydrolysis with fresh plant fragments produced as much as 71-76% in the acid-hydrolysis residue pool. Thus, if plant fragments are not largely removed prior to hydrolysis, the residue fraction may date much younger than it actually is.
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.subjecthydrochloric acid
dc.subjectinorganic acids
dc.subjecthydrolysis
dc.subjectGreat Plains
dc.subjectMichigan
dc.subjectNorth America
dc.subjectorganic carbon
dc.subjectArizona
dc.subjectchemical analysis
dc.subjectcomposition
dc.subjectsoils
dc.subjectorganic compounds
dc.subjectorganic materials
dc.subjectUnited States
dc.subjectC 14
dc.subjectcarbon
dc.subjectisotopes
dc.subjectradioactive isotopes
dc.subjectstable isotopes
dc.subjectC 13
dc.subjectfractionation
dc.titleEstimation of Slow- and Fast-Cycling Soil Organic Carbon Pools from 6N HCl Hydrolysis
dc.typeArticle
dc.typetext
dc.identifier.journalRadiocarbon
dc.description.noteThis material was digitized as part of a cooperative project between Radiocarbon and the University of Arizona Libraries.
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.volume38
dc.source.issue2
dc.source.beginpage231
dc.source.endpage239
refterms.dateFOA2021-02-11T20:44:28Z


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