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Soil management effects on organic carbon in isolated fractions of a Gray Luvisol

Plante, Alain F., Stewart, Catherine E., Conant, Richard T., Paustian, Keith, & Six, Johan (2006) Soil management effects on organic carbon in isolated fractions of a Gray Luvisol. Canadian Journal of Soil Science, 86(1), pp. 141-151.

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Abstract

Agricultural management affects soil organic matter, which is important for sustainable crop production and as a greenhouse gas sink. Our objective was to determine how tillage, residue management and N fertilization affect organic C in unprotected, and physically, chemically and biochemically protected soil C pools. Samples from Breton, Alberta were fractionated and analysed for organic C content. As in previous report, N fertilization had a positive effect, tillage had a minimal effect, and straw management had no effect on whole-soil organic C. Tillage and straw management did not alter organic C concentrations in the isolated C pools, while N fertilization increased C concentrations in all pools. Compared with a woodlot soil, the cultivated plots had lower total organic C, and the C was redistributed among isolated pools. The free light fraction and coarse particulate organic matter responded positively to C inputs, suggesting that much of the accumulated organic C occurred in an unprotected pool. The easily dispersed silt-sized fraction was the mineral-associated pool most responsive to changes in C inputs, whereas the microaggregate-derived silt-sized fraction best preserved C upon cultivation. These findings suggest that the silt-sized fraction is important for the long-term stabilization of organic matter through both physical occlusion in microaggregates and chemical protection by mineral association.

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8 citations in Web of Science®

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ID Code: 37770
Item Type: Journal Article
Additional URLs:
Keywords: Soil organic C, tillage, residue management, N fertilization, silt, clay
DOI: 10.4141/S05-037
ISSN: 0008-4271
Subjects: Australian and New Zealand Standard Research Classification > ENVIRONMENTAL SCIENCES (050000) > ECOLOGICAL APPLICATIONS (050100)
Australian and New Zealand Standard Research Classification > ENVIRONMENTAL SCIENCES (050000) > SOIL SCIENCES (050300)
Divisions: Past > Institutes > Institute for Sustainable Resources
Copyright Owner: Copyright 2006 Agricultural Institute of Canada
Deposited On: 08 Oct 2010 10:52
Last Modified: 01 Mar 2012 00:19

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