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从关中平原的头道塬、二道塬、三道塬以及延安地区的４个长期肥料定位试验地采集３４个土壤样品对土和黄绵土长期施用化肥和有机肥条件下有机质氧化稳定性和活性进行了较系统的研究。结果表明：长期施用有机肥或配施化肥，均能促进土和黄绵土耕层土壤易氧化有机质和活性有机质积累，提高Ｋｏｓ值；长期施用化肥，只能促进土壤有机质的老化，提高难氧化有机质含量和Ｋｏｓ值，对易氧化有机质和活性有机质无积极作用。相关分析和通径分析表明：与易氧化有机质和活性有机质关系最为密切的农化性状首先是速效磷，其次是碱解氮
34 soil samples were collected from 4 long-term fertilizer experiment sites in Taudaogen, Erdaowuan, Sandaoyuan and Yan’an areas of Guanzhong Plain for long-term application of chemical fertilizers and organic manure on the oxidation stability and activity of organic matter Conducted a more systematic study. The results showed that long-term application of organic fertilizer or chemical fertilizers could promote the accumulation of soil organic matter and active organic matter in soils and loess soils and increase the Kos value. Long-term application of chemical fertilizers could only promote the aging of soil organic matter and increase the content of difficult-to-oxidize organic matter Content and Kos value, on the oxidation of organic matter and active organic matter without a positive effect. Correlation analysis and path analysis showed that the most closely related to the susceptible organic matter and active organic matter agrochemical properties are the first available phosphorus, followed by alkaline hydrolysis nitrogen