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观测分析了黑土长期不同施肥30年后不同形态的活性有机碳含量(易氧化有机碳>轻组有机碳>微生物量碳>水溶性有机碳)的变化特征。结果表明,长期施用氮、氮磷和氮磷钾化肥对土壤活性有机碳无显著影响;长期施用有机肥以及有机肥配施化肥均显著提高了土壤活性有机碳含量,与不施有机肥相比,有机肥区组中土壤轻组有机碳和水溶性有机碳含量增幅较大,分别在122%～258%和237%～351%之间,而土壤易氧化有机碳和微生物量碳含量增幅分别在72%～98%和83%～112%。黑土不同形态活性有机碳对施肥的响应灵敏度为,轻组有机碳>水溶性有机碳>微生物量碳≈易氧化有机碳。因此,轻组有机碳是指示土壤有机碳变化的较好指标。
The changes of active organic carbon (organic carbon> light> organic carbon> microbial biomass carbon> water-soluble organic carbon) in different forms of black soil after long-term fertilization for 30 years were observed and analyzed. The results showed that the long-term application of nitrogen, nitrogen and phosphorus fertilizers and NPK fertilizers had no significant effect on soil active organic carbon. Both long-term application of organic fertilizers and organic fertilizers combined with chemical fertilizers significantly increased soil active organic carbon, compared with no organic fertilizers , And the contents of soil light organic carbon and water-soluble organic carbon increased significantly in the organic-fertilizer group, ranging from 122% to 258% and 237% to 351% respectively, while the increase of soil organic carbon and microbial biomass carbon increased In 72% ~ 98% and 83% ~ 112%. The response sensitivity of different forms of activated carbon in black soil to fertilization was light organic carbon> water-soluble organic carbon> microbial biomass carbon ≈ organic carbon. Therefore, light organic carbon is a better indicator of soil organic carbon change.