Stability and storage of soil organic carbon in a heavy-textured Karst soil from south-eastern Australia

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dc.contributor.authorHobley, Een_AU
dc.contributor.authorWillgoose, GRen_AU
dc.contributor.authorFrisia, Sen_AU
dc.contributor.authorJacobsen, GEen_AU
dc.date.accessioned2020-03-25T23:49:30Zen_AU
dc.date.available2020-03-25T23:49:30Zen_AU
dc.date.issued2014-05-09en_AU
dc.date.statistics2020-03-20en_AU
dc.description.abstractBoth aggregation and mineral association have been previously found to enhance soil organic carbon (SOC) storage (the amount of organic C retained in a soil), and stability (the length of time organic C is retained in a soil). These mechanisms are therefore attractive targets for soil C sequestration. In this study, we investigate and compare SOC storage and stability of SOC associated with fine minerals and stored within aggregates using a combination of particle-size fractionation, elemental analysis and radiocarbon dating. In this heavy-textured, highly aggregated soil, SOC was found to be preferentially associated with fine minerals throughout the soil profile. By contrast, the oldest SOC was located in the coarsest, most highly aggregated fraction. In the topsoil, radiocarbon ages of the aggregate-associated SOC indicate retention times in the order of centuries. Below the topsoil, retention times of aggregate-SOC are in the order of millennia. Throughout the soil profile, radiocarbon dates indicate an enhanced stability in the order of centuries compared with the fine mineral fraction. Despite this, the radiocarbon ages of the mineral-associated SOC were in the order of centuries to millennia in the subsoil (30–100 cm), indicating that mineral-association is also an effective stabilisation mechanism in this subsoil. Our results indicate that enhanced SOC storage does not equate to enhanced SOC stability, which is an important consideration for sequestration schemes targeting both the amount and longevity of soil carbon. © 2014 CSIRO Publishingen_AU
dc.identifier.citationHobley, E., Willgoose, G. R., Frisia, S., & Jacobsen, G. (2014). Stability and storage of soil organic carbon in a heavy-textured Karst soil from south-eastern Australia. Soil Research, 52(5), 476-482. doi:10.1071/SR13296en_AU
dc.identifier.govdoc8988en_AU
dc.identifier.issn1838-675Xen_AU
dc.identifier.issue5en_AU
dc.identifier.journaltitleSoil Researchen_AU
dc.identifier.pagination476-482en_AU
dc.identifier.urihttps://doi.org/10.1071/SR13296en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/9245en_AU
dc.identifier.volume52en_AU
dc.language.isoenen_AU
dc.publisherCSIRO publishingen_AU
dc.subjectAustraliaen_AU
dc.subjectSoilsen_AU
dc.subjectCarbon 14en_AU
dc.subjectMineralsen_AU
dc.subjectAgglomerationen_AU
dc.titleStability and storage of soil organic carbon in a heavy-textured Karst soil from south-eastern Australiaen_AU
dc.typeJournal Articleen_AU
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