Land-use affects the radiocarbon age, storage and depth distribution of soil organic carbon in Eastern Australia

Simple item page
dc.contributor.authorHobley, Een_AU
dc.contributor.authorWilson, Ben_AU
dc.contributor.authorHua, Qen_AU
dc.date.accessioned2016-05-20T00:28:18Zen_AU
dc.date.available2016-05-20T00:28:18Zen_AU
dc.date.issued2015-01-01en_AU
dc.date.statistics2016-05-20en_AU
dc.description.abstractLand-use has been shown to affect soil organic carbon (SOC) storage, with natural systems generally storing larger quantities of SOC than anthropogenically managed systems in surface soils. However, these effects are often difficult to detect deeper in the soil profile. Little is known regarding the effects of land-use on the radiocarbon age of SOC, both at the surface and deeper in the soil profile. We investigated the storage, radiocarbon content and depth distribution of soil organic carbon from across the state of NSW, Australia. A total of 100 profiles were analysed for total SOC concentration at numerous depths (up to 1 m) and a machine learning approach implementing tree ensemble methods was used to identify the key drivers of SOC depth distribution. Surface SOC storage was strongly associated with climate (predominately precipitation, to a lesser degree relative humidity and temperature), whereas SOC depth distribution was predominately influenced by land-use, soil type and to a lesser extent temperature. A subset of 12 soil profiles from a range of climate zones were analysed for radiocarbon content with a view to contrasting three land-use systems: natural, cleared/grazed and cropped. Radiocarbon content was affected strongly by land-use, with effects most pronounced at depth. Native systems appeared to have the youngest carbon throughout the profile, with cropped and grazed systems having older SOC. Radiocarbon content was also strongly associated with SOC content. Our results indicate that natural systems act as a carbon pump into the soil, injecting young, fresh organic carbon which is vertically distributed throughout the profile. In contrast, managed systems are deprived of this input and are depleted in SOC at all depths, leading to higher radiocarbon ages throughout the profile. © Author(s) 2015.en_AU
dc.identifier.articlenumberEGU2015-15846en_AU
dc.identifier.citationHobley, E, Wilson, B, & Hua, Q. (2015). Land-use affects the radiocarbon age, storage and depth distribution of soil organic carbon in Eastern Australia. Presentation to the European Geosciences Union General Assembly 2015, Vienna, Austria, 12-17 April.en_AU
dc.identifier.conferenceenddate17 April 2015en_AU
dc.identifier.conferencenameEuropean Geosciences Union General Assembly 2015en_AU
dc.identifier.conferenceplaceVienna, Austriaen_AU
dc.identifier.conferencestartdate12 April 2015en_AU
dc.identifier.govdoc6424en_AU
dc.identifier.otherEGU2015-15846en_AU
dc.identifier.urihttps://meetingorganizer.copernicus.org/EGU2015/EGU2015-15846.pdfen_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/6837en_AU
dc.identifier.volume17en_AU
dc.language.isoenen_AU
dc.publisherEuropean Geosciences Unionen_AU
dc.subjectLand useen_AU
dc.subjectIsotope datingen_AU
dc.subjectStorageen_AU
dc.subjectAustraliaen_AU
dc.subjectSoilsen_AU
dc.subjectAnthropologyen_AU
dc.titleLand-use affects the radiocarbon age, storage and depth distribution of soil organic carbon in Eastern Australiaen_AU
dc.typeConference Abstracten_AU
Files
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
EGU2015-15846(1).pdf
Size:
34.41 KB
Format:
Adobe Portable Document Format
Description:
Download
License bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
license.txt
Size:
1.71 KB
Format:
Item-specific license agreed upon to submission
Description:
Download
Collections
Conference Publications