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https://hdl.handle.net/1959.11/17289
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DC Field | Value | Language |
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dc.contributor.author | Fazle Rabbi, Sheikh M | en |
dc.contributor.author | Wilson, Brian | en |
dc.contributor.author | Lockwood, Peter V | en |
dc.contributor.author | Daniel, Heiko | en |
dc.contributor.author | Young, Iain | en |
dc.date.accessioned | 2015-05-12T14:57:00Z | - |
dc.date.issued | 2015 | - |
dc.identifier.citation | Soil & Tillage Research, 146(Part B), p. 193-203 | en |
dc.identifier.issn | 1879-3444 | en |
dc.identifier.issn | 0167-1987 | en |
dc.identifier.uri | https://hdl.handle.net/1959.11/17289 | - |
dc.description.abstract | The conventional model of aggregate formation suggests a hierarchy where micro-aggregates with lower porosity and therefore reduced soil organic carbon (SOC) mineralization form inside macro-aggregates. This model has however been questioned for highly weathered Oxisols where inconclusive results regarding the presence of aggregate hierarchy have been obtained to date. We hypothesized that in Oxisols (i) an aggregate hierarchy would be present (ii) the porosity of micro-aggregates would be lower than that of macro-aggregates and (iii) pore geometry of aggregates would influence SOC mineralization. We collected topsoils from Oxisols in northern New South Wales, Australia from which macro-aggregates (>250 μm), micro-aggregates (53-250 μm) and <53 μm fractions were isolated from bulk soil by wet sieving. 3D images of macro- and micro-aggregates were produced using X-ray computed tomography (μCT) showing the presence of micro-aggregates inside macro-aggregates, which confirmed the presence of an aggregate hierarchy in the Oxisols studied. Macro-aggregates were more common and SOC in higher concentrations in forest systems compared with agricultural (the cultivation or pasture) land-uses, but aggregate geometry differed little between the land-uses studied. The porosity of macro-aggregates (4%) was significantly lower than micro-aggregates (5.5%). Despite the differences in pore geometry between macro- and micro-aggregates, SOC mineralized (SOC'min') during a 2-month incubation (at 25°C) was similar in macro- (3% of SOC concentration) and micro-aggregates (2.8% of SOC concentration). We conclude that although aggregate hierarchy exists in these soils and that aggregate geometry did differ between aggregate size classes, there was no evidence to support the porosity exclusion principle and the assumption that SOC is preferentially stabilized within micro-aggregates in these soils. | en |
dc.language | en | en |
dc.publisher | Elsevier BV | en |
dc.relation.ispartof | Soil & Tillage Research | en |
dc.title | Aggregate hierarchy and carbon mineralization in two Oxisols of New South Wales, Australia | en |
dc.type | Journal Article | en |
dc.identifier.doi | 10.1016/j.still.2014.10.008 | en |
dc.subject.keywords | Agriculture, Land and Farm Management | en |
dc.subject.keywords | Soil Sciences | en |
local.contributor.firstname | Sheikh M | en |
local.contributor.firstname | Brian | en |
local.contributor.firstname | Peter V | en |
local.contributor.firstname | Heiko | en |
local.contributor.firstname | Iain | en |
local.subject.for2008 | 070199 Agriculture, Land and Farm Management not elsewhere classified | en |
local.subject.for2008 | 050399 Soil Sciences not elsewhere classified | en |
local.subject.seo2008 | 961499 Soils not elsewhere classified | en |
local.profile.school | School of Environmental and Rural Science | en |
local.profile.school | Office of Faculty of Science, Agriculture, Business and Law | en |
local.profile.school | School of Environmental and Rural Science | en |
local.profile.school | Administration | en |
local.profile.school | School of Environmental and Rural Science | en |
local.profile.email | sfazler2@une.edu.au | en |
local.profile.email | bwilson7@une.edu.au | en |
local.profile.email | plockwoo@une.edu.au | en |
local.profile.email | hdaniel@une.edu.au | en |
local.profile.email | iyoung4@une.edu.au | en |
local.output.category | C1 | en |
local.record.place | au | en |
local.record.institution | University of New England | en |
local.identifier.epublicationsrecord | une-20150504-105845 | en |
local.publisher.place | Netherlands | en |
local.format.startpage | 193 | en |
local.format.endpage | 203 | en |
local.identifier.scopusid | 84911155057 | en |
local.peerreviewed | Yes | en |
local.identifier.volume | 146 | en |
local.identifier.issue | Part B | en |
local.contributor.lastname | Fazle Rabbi | en |
local.contributor.lastname | Wilson | en |
local.contributor.lastname | Lockwood | en |
local.contributor.lastname | Daniel | en |
local.contributor.lastname | Young | en |
dc.identifier.staff | une-id:sfazler2 | en |
dc.identifier.staff | une-id:bwilson7 | en |
dc.identifier.staff | une-id:plockwoo | en |
dc.identifier.staff | une-id:hdaniel | en |
dc.identifier.staff | une-id:iyoung4 | en |
local.profile.orcid | 0000-0002-7983-0909 | en |
local.profile.role | author | en |
local.profile.role | author | en |
local.profile.role | author | en |
local.profile.role | author | en |
local.profile.role | author | en |
local.identifier.unepublicationid | une:17503 | en |
local.identifier.handle | https://hdl.handle.net/1959.11/17289 | en |
dc.identifier.academiclevel | Academic | en |
dc.identifier.academiclevel | Academic | en |
dc.identifier.academiclevel | Academic | en |
dc.identifier.academiclevel | Academic | en |
dc.identifier.academiclevel | Academic | en |
local.title.maintitle | Aggregate hierarchy and carbon mineralization in two Oxisols of New South Wales, Australia | en |
local.output.categorydescription | C1 Refereed Article in a Scholarly Journal | en |
local.search.author | Fazle Rabbi, Sheikh M | en |
local.search.author | Wilson, Brian | en |
local.search.author | Lockwood, Peter V | en |
local.search.author | Daniel, Heiko | en |
local.search.author | Young, Iain | en |
local.uneassociation | Unknown | en |
local.identifier.wosid | 000347499100008 | en |
local.year.published | 2015 | en |
local.subject.for2020 | 300299 Agriculture, land and farm management not elsewhere classified | en |
local.subject.for2020 | 410699 Soil sciences not elsewhere classified | en |
local.subject.seo2020 | 180699 Terrestrial systems and management not elsewhere classified | en |
Appears in Collections: | Journal Article School of Environmental and Rural Science |
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