All rights reserved. No part of this periodical may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, recording, or any information storage and retrieval system, without permission in writing from the publisher. Permission for printing and for reprinting the material contained herein has been obtained by the publisher. Permanganate Oxidizable Carbon Refl ects a ProcessedSoil Fraction that is Sensitive to Management Soil Biology & Biochemistry P articulate organic C and MBC are important C fractions that refl ect key processes such as nutrient cycling and availability, soil aggregation, and soil C accrual (Wardle, 1992;Six et al., 1998;Wander, 2004). A large number of studies have shown that both POC and MBC are sensitive to changes in management such as reduced tillage, cover cropping and land use (Cambardella and Elliott, 1992;Wardle, 1992;Wander and Bidart, 2000;Grandy and Robertson, 2007). Th is sensitivity has led to wide adoption of these methods in soil science as indicators of change in the soil ecosystem (Wander, 2004;Gil-Sotres et al., 2005;Kaschuk et al., 2010).As informative as POC and MBC are, they are expensive soil measures for most applications outside of a research setting. Although adaptations have been made to streamline the extraction process of POC (Marriott and Wander, 2006a) and MBC (Fierer et al., 2003), these methods remain costly due to the required labor and combustion analyzer to quantify the total C in the extracted fraction. In addition to the cost, there is a large degree of variation on how researchers extract

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