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Clay illuviation provides a longterm sink for C sequestration in subsoils

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Show simple item record Torres-Sallan, Gemma Schulte, Rogier, P.O. Lanigan, Gary J. Byrne, Kenneth A. Reidy, Brian Simo, Iolanda Six, Johan Creamer, Rachel E. 2017-05-22T11:41:02Z 2017-05-22T11:41:02Z 2017
dc.description peer-reviewed en_US
dc.description.abstract Soil plays a key role in the global carbon (C) cycle. Most current assessments of SOC stocks and the guidelines given by Intergovernmental Panel on Climate Change (IPCC) focus on the top 30 cm of soil. Our research shows that, when considering only total quantities, most of the SOC stocks are found in this top layer. However, not all forms of SOC are equally valuable as long-term stable stores of carbon: the majority of SOC is available for mineralisation and can potentially be re-emitted to the atmosphere. SOC associated with micro-aggregates and silt plus clay fractions is more stable and therefore represents a long-term carbon store. Our research shows that most of this stable carbon is located at depths below 30 cm (42% of subsoil SOC is located in micro-aggregates and silt and clay, compared to 16% in the topsoil), specifically in soils that are subject to clay illuviation. This has implications for land management decisions in temperate grassland regions, defining the trade-offs between primary productivity and C emissions in clay-illuviated soils, as a result of drainage. Therefore, climate smart land management should consider the balance between SOC stabilisation in topsoils for productivity versus sequestration in subsoils for climate mitigation. en_US
dc.language.iso eng en_US
dc.publisher Nature Publishing Group en_US
dc.relation.ispartofseries Scientic Reports;7: 45635
dc.subject MECHANISMS en_US
dc.subject soil organic-matter en_US
dc.subject no-tillage en_US
dc.subject land-use en_US
dc.subject agricultural soils en_US
dc.title Clay illuviation provides a longterm sink for C sequestration in subsoils en_US
dc.type info:eu-repo/semantics/article en_US
dc.type.supercollection all_ul_research en_US
dc.type.supercollection ul_published_reviewed en_US 2017-05-22T11:33:19Z
dc.description.version PUBLISHED
dc.identifier.doi 10.1038/srep45635
dc.rights.accessrights info:eu-repo/semantics/openAccess en_US
dc.internal.rssid 2708998
dc.internal.copyrightchecked Yes
dc.identifier.journaltitle Scientific Reports
dc.description.status peer-reviewed

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