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Changes in soil organic matter with cropping as measured by organic carbon fractions and 13C natural isotope abundance

Authors:	Lefroy Rod D B Blair Graeme J Strong Wayne M

Institution:	(1) Department of Agronomy and Soil Science, University of New England, 2351 Armidale, N.S.W.;(2) Queensland Wheat Research Institute, P.O. Box 2282, 4350 Toowoomba, Qld.

Abstract:	The decline in soil organic matter with cropping is a major factor affecting the sustainability of cropping systems. Changes in total C levels are relativelyinsensitive as a sustainability measure. Oxidation with different strength KMnO₄ has been shown to be a more sensitive indicator of change. The relative size of soil C fractions oxidised by 333 mM KMnO₄ declined with cropping, whilst the relative size of the unoxidised fraction increased. Changes in ¹³C ratio have been used to measure C turnover in systems which include C3 and C4 species.

Keywords:	carbon-13 cropping systems ¹³C" target="_blank">gif" alt="delta" align="BASELINE" BORDER="0">¹³C KMnO₄ oxidation soil organic matter
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