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dc.contributor.authorPaul, Eldor A.
dc.contributor.authorWright, S.
dc.contributor.authorCollins, H. P.
dc.contributor.authorHaile-Mariam, S.
dc.date.accessioned2007-01-03T07:05:42Z
dc.date.available2007-01-03T07:05:42Z
dc.date.issued2008-03
dc.descriptionIncludes bibliographical references (page 378).
dc.description.abstractSoil organic matter (SOM) in agricultural soils comprises a significant part of the global terrestrial C pool. It has often been characterized by utilizing a combination of chemical dispersion of the soil followed by physical separation. We fractionated soil samples under continuous corn (Zea mays L.) rotations at four long-term sites in the Corn Belt to determine the concentration of C and N associated with soil fractions (light fraction [LF], particulate organic matter [POM], silt size, clay size, and Bradford reactive soil protein [BRSP]) and to identify the change in C concentration and δ13C signal of each fraction using laboratory incubations. Light fractions comprised 3 to 5% of the soil organic carbon (SOC), with no significant difference between conventional tillage (CT) and no-till (NT) treatments. The POM fraction accounted for 5 to 11% of the SOC in the soils with >30% clay and 17 to 23% for the soils with <20% clay. The clay-size fraction contained the highest proportion of SOC. Measurement of 13C during long-term incubation showed that the average mean residence time (MRT) of corn-derived C in the LF was 3.5 yr, whereas the POM fractions ranged from 6 to 12 yr. The 13C changes during incubation show that both fractions consist of a mixture of active and resistant materials, with movement between fractions. The BRSP has long MRTs except in the NT Hoytville soil. Measurement of the dyna mics of these fractions provides a basis for C models to test the impacts of land use and management on C sequestration.
dc.format.mediumborn digital
dc.format.mediumarticles
dc.identifier.bibliographicCitationHaile-Mariam, S., H. P. Collins, S. Wright and E. A. Paul, Fractionation and Long-Term Laboratory Incubation to Measure Soil Organic Matter Dynamics. Soil Science Society of America Journal 72, no. 2 (March-April 2008): 370-378. https://dx.doi.org/10.2136/sssaj2007.0126.
dc.identifier.doihttps://dx.doi.org/10.2136/sssaj2007.0126
dc.identifier.urihttp://hdl.handle.net/10217/85523
dc.languageEnglish
dc.publisherColorado State University. Libraries
dc.publisher.originalSoil Science Society of America
dc.relation.ispartofFaculty Publications - Natural Resource Ecology Laboratory (NREL)
dc.rights©2008 Soil Science Society of America
dc.subjectCO2
dc.subjectsoil C
dc.subjectsoil N
dc.subjectSOM
dc.subjectglobal terrestrial C and N pools
dc.titleFractionation and long-term laboratory incubation to measure soil organic matter dynamics
dc.typeText


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