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对黄土区分布较广的上和黄绵土、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。通径分析和逐步回归分析表明，与易氧化有机质和活性有机质关系最为密切的农化性状先是速效磷，其次是碱解氮。
Under the long-term application of chemical fertilizers and organic manure, the oxidative stability and the activity of organic matter in the upper loess and loess loess which are widely distributed in the loess area were systematically studied. The results showed that long-term application of organic manure or chemical fertilizers could promote the accumulation of soil organic matter and active organic matter in the topsoil, and increase the Kos value. The long-term application of chemical fertilizers could only promote the aging of soil organic matter and increase the content of unsaturated organic matter and Kos value , On the easy oxidation of organic matter and active organic matter without a positive effect. Path analysis and stepwise regression analysis showed that the most closely related to the susceptible organic matter and active organic matter agrochemical properties are available phosphorus, followed by alkaline hydrolysis of nitrogen.