Abstract:

Applied field trials, four tillage patterns including abandoned, tilled, no-tillage and rotary were designed to study the effects of different tillage modes on soil organic carbon and carbon management index (CMI) in North China Plain. The change in the SOC contents and different form labile organic carbon in these four different tillage modes were studied. Then contrastive analyzed the effect of different tillage modes on carbon management index. The results showed that, no-tillage and rotary were both beneficial to the accumulation of SOC. Compared with abandoned, total organic carbon under no-tillage and rotary respectively increased 26.42% and 12.52%. The active organic carbon responded to different tillage modes in different ways. Compared with abandoned, when took the mode of tilled, no-tillage and rotary, easily oxidized organic carbon respectively increased 23.72%, 44.34%, 27.84%, water oxidized organic carbon respectively increased 24.11%, 24.56%, 43.89%. Soil microbial biomass increased 109% under no-tillage. There were no significant change under other tillage modes, soil cultivation had promotion effect to optimize carbon management index, the mode of tilled, no-tillage and rotary had respective increased at 47.82%, 27.18% and 30.47%. From this, we could see that, different tillage modes had significant effect on organic carbon library activities in fluvo-aquic soils.