Table 2Carbon concentration and C/N ratios (means1 S.E.) of sand-free aggregates of four size classes (>2000 mm: large macroaggregates, 250–2000 mm: small macroaggregates,53–250 mm: microaggregate, <53 mm: silt and clay fraction) from two soil depths of a native forest and four sugarcane (SC) plots with 20, 25, 43, and 50 years of agriculturaluse. Within an aggregate size class and soil depth, means with different uppercase letters indicate significant differences among plots (P < 0.05). For a given plot type and soildepth, means with different lowercase letters indicate significant differences among aggregate size classes.
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