| Soil organic carbon plays an important role in the soil ecosystems. This paper studied changes of soil organic carbon and carbon-pool management index (CMI) deserted salinized fields with different reclamation history. Results showed that soil organic carbon and active organic carbon were decreased with depth of soil layer. Soil organic carbon was decreased in the first year after the reclamation, the soil labile organic carbon (LOC) of R3, R5 and R10 was 20.28%, 16.00% and 16.45% respectively higher than that in the control, reaching significant levels. Soil carbon-pool management index (CMI) was lower than CK during early reclamation stage. With reclamation forwarding, CMIs of R3, R5 and R10 were 54.72%, 19.79% and 17.73% higher than CK, respectively. R3, R5, and R10 were 3.20, 2.48, and 2.43 times as much as R1. All above indicated that soil quality was improved to a certain degree after a long-term restoration of the salinized field, and soil carbon sink was also enhanced. Correlation analysis showed that LOC and CMI were significant positive correlated to soil Olsen-P. LOC and CMI could reflect the changes of soil carbon pool in different years of reclamation, better than TOC. |