Application of RothPC-1 to soil carbon profiles in cracking soils under minimal till cultivation

Wells, T., Hancock, G. R., Dever, C. and Martinez, C. (2013) Application of RothPC-1 to soil carbon profiles in cracking soils under minimal till cultivation. Geoderma, 207-208 144-153. doi:10.1016/j.geoderma.2013.05.018


Author Wells, T.
Hancock, G. R.
Dever, C.
Martinez, C.
Title Application of RothPC-1 to soil carbon profiles in cracking soils under minimal till cultivation
Journal name Geoderma   Check publisher's open access policy
ISSN 0016-7061
1872-6259
Publication date 2013-10-01
Sub-type Article (original research)
DOI 10.1016/j.geoderma.2013.05.018
Open Access Status Not yet assessed
Volume 207-208
Start page 144
End page 153
Total pages 10
Place of publication Amsterdam, Netherlands
Publisher Elsevier BV
Language eng
Abstract This study examines soil organic carbon (SOC) profiles in two neighbouring field sites ('Dog' and 'Shed' paddocks) which share a similar land use history but are characterised by different soil types (euchrozem and vertosol). SOC inventories to 30. cm depth at the two sites were similar however enhanced transport of SOC in the cracking vertosol soils of the Shed paddock produced a significantly flatter SOC profile and higher whole profile SOC inventories at this site. No clear relationship was observed between clay content and SOC distribution at either sample site. Modelling of SOC turnover using RothPC-1 yielded a satisfactory fit to the observed SOC profiles however the soil moisture and temperature values calculated within the model were found to be at odds with 5. year field observations reported from the site. When field measured values for the moisture and temperature were substituted into the model the fit to the observed SOC profiles was significantly poorer indicating that the purely convective transport approach used to model SOC movement within RothPC-1 may not be sufficient to model vertical SOC transport in cracking soils. The results highlight the need for a cautious approach when using RothPC-1 in arid, cracking soil environments.
Keyword Cracking soil
RothPC-1
Soil carbon
Vertical transport
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Agriculture and Food Sciences
 
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