[Effects of land use type on soil organic carbon storage in aquic brown soil]

The profile distribution of soil organic carbon (SOC), its storage, and carbon/nitrogen (C/N) ratio at the depth of 0-100 cm under different land use types were investigated in this paper. The results showed that the profile distribution of SOC varied significantly with land use type. The SOC contents in each soil layer in forestland, mowing land and wasteland were all higher than that in agricultural land. In all land use types, SOC was significantly correlated with soil total N. Soil C/N ratio generally decreased with depth, which was higher in forestland than in mowing land, wasteland and bare land, and was the lowest in agricultural land. At the depth of 0-100 cm, the annual sequestration of SOC in wasteland was 4.52, 4.25, 4.46 and 3.58 t x hm(-2) more than that in farmland with no fertilization, farmland with recycled manure application, farmland with N, P and K fertilization, and farmland with the application of both recycled manure and N, P and K, respectively, suggesting that wasteland had a great potential in increasing SOC storage.