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Does the acid hydrolysis–incubation method measure meaningful soil organic carbon pools?

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dc.contributor.authorConant, Richard T., author
dc.contributor.authorMorris, Sherri J., author
dc.contributor.authorPaul, Eldor A., author
dc.contributor.authorPlante, Alain F., author
dc.contributor.authorSoil Science Society of America, publisher
dc.date.accessioned2007-01-03T07:05:43Z
dc.date.available2007-01-03T07:05:43Z
dc.date.issued2006-05
dc.description.abstractThe literature was reviewed and analyzed to determine the feasibility of using a combination of acid hydrolysis and CO2–C release during long-term incubation to determine soil organic carbon (SOC) pool sizes and mean residence times (MRTs). Analysis of 1100 data points showed the SOC remaining after hydrolysis with 6 M HCl ranged from 30 to 80% of the total SOC depending on soil type, depth, texture, and management. Nonhydrolyzable carbon (NHC) in conventional till soils represented 48% of SOC; no-till averaged 56%, forest 55%, and grassland 56%. Carbon dates showed an average of 1200 year greater MRT for the NHC fraction than total SOC. Long-term incubation, involving measurement of CO2 evolution and curve fitting, measured active and slow pools. Active-pool C comprised 2 to 8% of the SOC with MRTs of days to months; the slow pool comprised 45 to 65% of the SOC and had MRTs of 10 to 80 yr. Comparison of field 14C and 13C data with hydrolysis–incubation data showed a high correlation between independent techniques across soil types and experiments. There were large differences in MRTs depending on the length of the experiment. Insertion of hydrolysis–incubation derived estimates of active (Ca), slow (Cs), and resistant pools (Cr) into the DAYCENT model provided estimates of daily field CO2 evolution rates. These were well correlated with field CO2 measurements. Although not without some interpretation problems, acid hydrolysis–laboratory incubation is useful for determining SOC pools and fluxes especially when used in combination with associated measurements.
dc.format.mediumborn digital
dc.format.mediumarticles
dc.identifier.bibliographicCitationPaul, Eldor A., Sherri J. Morris, Richard T. Conant, and Alain F. Plante, Does the Acid Hydrolysis–Incubation Method Measure Meaningful Soil Organic Carbon Pools?. Soil Science Society of America Journal 70, no. 3 (May-June 2006): 1023-1035. https://dx.doi.org/10.2136/sssaj2005.0103.
dc.identifier.doihttps://dx.doi.org/10.2136/sssaj2005.0103
dc.identifier.urihttp://hdl.handle.net/10217/85555
dc.languageEnglish
dc.language.isoeng
dc.publisherColorado State University. Libraries
dc.relation.ispartofFaculty Publications
dc.rights©2006 Soil Science Society of America.
dc.rightsCopyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright.
dc.subjectnutrient cycling
dc.subjectC
dc.subjectsoil formation
dc.subjectecosystem functioning
dc.subjectSOM
dc.subjectfractionation
dc.titleDoes the acid hydrolysis–incubation method measure meaningful soil organic carbon pools?
dc.typeText

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Does the acid hydrolysis incubation method measure meaningful soil organic carbon pools?
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