Abstract: Soil carbon management index is a comprehensive index to characterize the accumulation and quality of soil organic carbon. It can effectively reflect the influence of human activities on soil quality. This research characterized the effects of some agricultural practices （fertilization， tillage， land leveling， soil improvement） and land use transformation on carbon management index of soils， based on the comparison of paired soil samples. The results showed that application of organic manure， implementation of straw returning and planting green manure could significantly increase carbon management index of soils. Application of chemical fertilizer exhibited certain improving effect on carbon management index in low\|organic carbon soils， but its effect on high\|organic carbon soils was not obvious. Deep ploughing， land leveling， and liming could decrease carbon management index of soils. Soil carbon management index decreased significantly after transforming the land use from rice field into vegetable land， and the decline extent was greater in greenhouse vegetable land than open vegetables land. Soil carbon management index was also changed after transforming the land use from rice field into economic forest， which decreased significantly at the early stage after planting economic forest， and then increased gradually with the increasing planting time. Transforming forestland into upland could decrease soil carbon management index. Carbon management index for coastal soil increased gradually with increasing years of the improvement and reclamation of soils.

Key words: soil, land use, fertilization, tillage, carbon management index