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以长期定位试验为研究对象,分析了长期施肥对土壤不同层次活性碳的影响,并计算了各处理的碳库指数和碳库管理指数。结果表明,土壤活性碳均随土层的增加而减少0,～7.5 cm土层的活性有机碳平均比7.5～15 cm、15～30 cm、30～50 cm高出6.6%、23.4%、57.1%。施肥均可以提高土壤活性有机碳和碳库指数。单施有机肥培肥土壤和有机肥、化肥的配合施肥对提高土壤中活性有机碳的作用较单纯施用化肥更为显著。施肥除了绿+N、秸+N、农+绿+N处理的碳库管理指数降低外,其它各处理的碳库管理指数均有所增加。农业生产中必须重视有机肥的合理施用,使土壤碳库处于良性状态,最终才有可能维持土壤的可持续性利用。
Taking the long-term experiment as the research object, the effect of long-term fertilization on the activated carbon in different soil layers was analyzed and the carbon pool index and carbon pool management index of each treatment were calculated. The results showed that soil active carbon decreased by 0 with the increase of soil layer, and the active organic carbon in ~ 7.5 cm soil layer was 6.6%, 23.4% and 57.1 higher than that of 7.5 ~ 15 cm, 15 ~ 30 cm and 30 ~ 50 cm, respectively %. Fertilization can increase soil active organic carbon and carbon pool index. The application of organic fertilizer to fertilize the soil and organic fertilizer, the fertilization of chemical fertilizer to improve the activity of active organic carbon in the soil is more significant than the simple application of chemical fertilizer. Fertilizer addition to the green + N, straw + N, agricultural + green + N treatment of carbon management index decreased, the other treatment of carbon management index has increased. Agricultural production must pay attention to the rational use of organic fertilizers to make the soil carbon pool in a benign state, and ultimately it is possible to maintain the sustainable use of soil.