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The proportion of 250-2000 [micro]m in PBMF and MEBF was 16.48% and 20.47% lower than that in PF.
They were in the order of PF < PBMF < MEBF, but there was no significant difference between PF and PBMF.
In our experimental site, the above-ground biomass and the litter input in PF, PBMF, and MEBF were 122.5,164.1, and 290.4 t x [hm.sup.-2]  and 3.31, 8.50, and 8.28 t x [hm.sup.-2] x [y.sup.-1], respectively.
Additionally, our result showed a significantly higher proportion of passive C in MEBF and PBMF than in PF in surface soils (0-15 cm and 15-30 cm) but a higher proportion of active C in deep soil layers (30-45 cm and 45-60 cm) (Figure 2).
Quantification of SOC content in the different fraction size classes showed that the highest water-stable aggregate particle organic carbon was found in MEBF, then PBMF, and the last was PF.Besides, our result observed in the surface soil (0-15 cm and 1530 cm) that the proportion of large macroaggregates (>2 mm) increased with the forest succession, while in the deeper soil (45-60 cm), small macroaggregates' (0.25-2 mm) proportion decreased with succession but silt- and clay-size fraction (<0.053 mm) increased with the increasing age of forest.
Furthermore, our result showed a significantly higher proportion of passive C in MEBF and PBMF than in PF in surface soils (0-15 cm and 15-30 cm) but a higher proportion of active C in deep soil layers (30-45 cm and 45-60 cm).
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