The soil organic carbon(SOC) contents

distribution of organic carbon in soil aggregates

and organic carbon contribution rates of variously sized soil aggregates were studied during vegetation restoration in Ziwuling Mountain. The results show that the weighted mean of SOC was 3. 54 g/kg for the 0-100cm soil profile of sloped cropland

while the weighted means of SOC of 0-100cm soil profiles of abandoned land

grassland

shrub and arbor phases were 6.8%

36.6%

41.5% and 73.6%

respectively

higher than that of slop cropland. T he increasing magnitudes of SOC contents of 0-20 cm soil layer were higher than those of soil layers below following vegetation restoration.The SOC contents of aggregates of all sizes in the 0-5 and 5-10cm soil layers increased gradually and the SOC enriched in the macroaggregates(>2mm) over time along with vegetation restoration. No clear change of SOC contents in the 10-20 cm soil layer for aggregates of all sizes. The SOC contribution rates of>5

5~ 2 and 2~ 1mm aggregates in 0-20 cm soil layer of abandoned land

grassland

shrub and arbor were higher than that of sloped cropland

indicating that the increased part of SOC in 0-20 cm soil layer were stored mainly in>1mm aggregates during vegetation restoration.