Abstract:

In order to study the effects of different land use/cover change (LUCC) types on soil carbon storage, the changes were analyzed based on the data of soil organic carbon contents at different time. The results showed that: (a) there was a leap decrease on soil orgamic carbon storage in the early stage when sedgelands changed into poplar forest, which mainly lead to the loss of soil organic carbon at or below 40 cm depth; (b) the land lost soil organic carbon at 33.89 t/hm2 after 8 years of poplars plantation; (c) taking away the aboveground vegetation products every year changed soil organic carbon storage gradually, which mainly affected soil carbon accumulation in the top layer of soil especially at 0~10 cm depth. Compared with sedgeland which had not been disturbed by human, the soil carbon accumulation reduced 1.95 t/hm2 within 8 years; (d) whatever LUCC types, all reduced soil carbon accumulation in wetland and grassland of Dongting Lake.