Comparison of the particulate organic carbon and permanganate oxidation methods for estimating labile soil organic carbon

Skjemstad, J. O., Swift, R. S. and McGowan, J. A. (2006) Comparison of the particulate organic carbon and permanganate oxidation methods for estimating labile soil organic carbon. Australian Journal Of Soil Research, 44 3: 255-263. doi:10.1071/SR05124


Author Skjemstad, J. O.
Swift, R. S.
McGowan, J. A.
Title Comparison of the particulate organic carbon and permanganate oxidation methods for estimating labile soil organic carbon
Journal name Australian Journal Of Soil Research   Check publisher's open access policy
ISSN 0004-9573
1446-568X
Publication date 2006
Sub-type Article (original research)
DOI 10.1071/SR05124
Open Access Status
Volume 44
Issue 3
Start page 255
End page 263
Total pages 9
Place of publication Collingwood
Publisher Csiro Publishing
Collection year 2006
Language eng
Subject CX
Abstract Forty-four soils from under native vegetation and a range of management practices following clearing were analysed for ‘labile’ organic carbon (OC) using both the particulate organic carbon (POC) and the 333 mm KmnO4 (MnoxC) methods. Although there was some correlation between the 2 methods, the POC method was more sensitive by about a factor of 2 to rapid loss in OC as a result of management or land-use change. Unlike the POC method, the MnoxC method was insensitive to rapid gains in TOC following establishment of pasture on degraded soil. The MnoxC method was shown to be particularly sensitive to the presence of lignin or lignin-like compounds and therefore is likely to be very sensitive to the nature of the vegetation present at or near the time of sampling and explains the insensitivity of this method to OC gain under pasture. The presence of charcoal is an issue with both techniques, but whereas the charcoal contribution to the POC fraction can be assessed, the MnoxC method cannot distinguish between charcoal and most biomolecules found in soil. Because of these limitations, the MnoxC method should not be applied indiscriminately across different soil types and management practices.
Keyword labile C
permanganate
POM
POC
Q-Index Code CX

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
Queensland Alliance for Agriculture and Food Innovation
 
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Created: Wed, 15 Aug 2007, 08:32:54 EST