论文部分内容阅读
通过15年长期定位试验,研究了不同施肥管理对黑土活性有机碳库的形成及碳库管理指数(CMI)的影响。结果表明,土壤有机碳、活性有机碳及CMI发生了显著的变化。与原始土壤相比,在东北黑土区经过15年的施有机肥及NPK化肥(NPKOM)与NP2K、NPK处理,土壤有机碳含量显著提高,其余处理间差异不显著。除NPKOM处理外,其余各处理土壤的CMI均呈下降趋势。不同活度的活性有机碳含量比较发现总体趋势为高活性有机碳<中等活性有机碳<惰性有机碳,各处理之间的变化趋势大体相同为NPKOM>NPK>NP≈NP2K>NK≈N2PK>PK>CK。从回归方程的分析可知,土壤中高活性有机碳的变化可以解释阳离子交换量变化的89.5%,交换性Ca含量变化的78%,交换性Mg含量变化的70.6%。从相关分析表明,作物产量,CMI和各处理的土壤中高活性有机碳含量呈极显著相关。
After 15 years of long-term experiment, the effects of different fertilization management on the formation of black carbon active organic carbon pool and carbon inventory management index (CMI) were studied. The results showed that there was a significant change in soil organic carbon, active organic carbon and CMI. Compared with the original soil, after 15 years of applying organic fertilizer and NPK fertilizer (NPKOM) and NP2K and NPK treatment in the black soil area of Northeast China, the content of soil organic carbon increased significantly, while the other treatments showed no significant difference. In addition to NPKOM treatment, the rest of the soil CMI showed a downward trend. The active organic carbon contents of different activities showed that the overall trend was high activity organic carbon NPK> NP≈NP2K> NK≈N2PK> PK > CK. The analysis of the regression equation shows that the change of highly active organic carbon in soil can explain 89.5% of the cation exchange capacity, 78% of the exchangeable Ca content and 70.6% of the exchangeable Mg content. Correlation analysis showed that there was a significant correlation between crop yield, CMI and high activity of organic carbon in soils.