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soils constructed after mining often have low carbon (c) stocks and low quality of organic matter (OM). cover crops are decisive for the recovery process of these stocks, improving the quality of constructed soils. therefore, the goal of this study was to evaluate the effect of cover crops on total organic c (tOc) stocks, c distribution in physical fractions of OM and the c management index (cMi) of a soil constructed after coal mining. the experiment was initiated in 2003 with six treatments: Hemarthria altissima (t1), Paspalum notatum (t2), Cynodon dactylon (t3), Urochloa brizantha (t4), bare constructed soil (t5), and natural soil (t6). soil samples were collected in 2009 from the 0.00-0.03 m layer, and the tOc and c stocks in the physical particle size fractions (carbon in the coarse fraction -ccF, and mineral-associated carbon -Mac) and density fractions (free light fraction -FlF; occluded light fraction -OlF, and heavy fraction -hF) of OM were determined. the cMi components: carbon pool index (cPi), lability (l) and lability index (li) were estimated by both fractionation methods. no

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