Soil organic carbon(SOC) is an important carbon pool in the terrestrial system

to inspect the effect on SOC of intensive practice in the bamboo stands

soil samples under bamboo stands which had 5~10 year history intensive management were collected as profile sample. The plots under traditional practices were sampled for comparison. It is found that intensive practice caused a decrease in total organic carbon(TOC)

water soluble organic carbon(WSOC) and microbial biomass(MBC) compared with those under traditional plot

the difference reach significant level(P<0.05). The percentage of MBC to TOC was observed in decline trends. The molecule weight of WSOC appeared drop to after intensive management. However

the minerable carbon amount and their percentage to TOC was getting ascend

indicating lower stability of SOC but easy to mineralization. These different fractions of organic mentioned above were all interrelated(P<0.05)

and they also were well related to soil total nitrogen(TN) and hydrolysable nitrogen(HN)

but not available phosphorus(A-P) and available potassium(A-K). The profile distribution of different fractions of organic carbon were not altered by intensive practice.