不同施肥处理对塿土和黄绵土有机质氧化稳定性的影响

Effects of Different Applications of Fertilizers to Lou Soil and Yellow Loamy soil on the Oxidable Stability of Soil

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 condition of Long-term(6,8,10 years)application of chemical andorganic fertilizers to lou soil and yellow loamy soil,the stability and activity of soil organicmatter were studied systemetically.The results Showed that the oxidable,active organicmatters and the coefficient of oxidable stabilily(Kos value)all increased with long-termapplication of organic fertilizer or combined with chemical fertilizer,and that long-termapplication of chemical fertilizer had little positive effect on the oxidable and active organicmatters,but the difficutly oxidable organic matter and the Kos value were improved.Bymeans of gradual regreission analysis and path coefficient analysis,it showed that the oxid-able and active organic matters had close correlation with the available phosphorus and theavailable nitrogen