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借助４个长期肥料定位试验，对土娄土和黄绵土在施用化肥和有机肥条件下腐殖质组分系统研究结果表明，土娄土和黄绵土腐殖质均以胡敏素含量为主，胡敏酸次之，富里酸最少。长期施用有机肥或配施化肥，可促进土壤胡敏酸、富里酸和胡敏素积累，提高ＨＡ／ＦＡ比值。长期施用化肥可增加土壤胡敏素和胡敏酸的含量，ＨＡ／ＦＡ比值亦得到提高。通径分析和逐步回归分析表明，碱解氮和ｐＨ值与胡敏酸和富里酸关系最为密切，而全氮和速效磷则与胡敏素关系最为密切。
With four long-term fertilizer experiments, the results of humus composition system of soil loess and loessial soil under application of chemical fertilizers and organic fertilizers showed that humus content of soil loess and loessial soil were dominated by humin, followed by humic acid, At least acid. Long-term application of organic fertilizer or chemical fertilizers can promote the accumulation of soil humic acid, fulvic acid and humin and increase the HA / FA ratio. Long-term application of chemical fertilizers can increase soil humin and humic acid content, HA / FA ratio has also been increased. Path analysis and stepwise regression analysis showed that the relationship between pH and alkalis was most closely related to humic acid and fulvic acid, while total nitrogen and available phosphorus had the closest relationship with humin.