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198 4～ 1990年定位试验 ,研究长期施用化肥、有机肥、化肥与有机肥配施对土壤中有机质的含量 ,有机质的氧化稳定性和活性及土壤腐殖质组成变化产生的影响。结果表明 ,有机肥长期单施或与化肥配施 ,均明显促进耕层 ( 0～ 2 0 cm)土壤有机质的积累 ,增加了易氧化有机质和活性有机质的含量 ,提高了 Kos值 ,使耕层土壤松结态、联结态、紧结态腐殖质含量增加 ,而长期施用化肥 ,耕层有机质增加幅度小 ,提高了难氧化有机质含量 ,使 Kos增大 ,紧结态腐殖质含量增加
198 4 ~ 1990 positioning experiment to study the long-term application of chemical fertilizers, organic manure, chemical fertilizer and organic manure on soil organic matter content, organic matter oxidation stability and activity and soil humus composition changes. The results showed that the long-term application of organic manure alone or combined with chemical fertilizers significantly promoted the accumulation of organic matter in the topsoil (0 ~ 20 cm), increased the content of organic matter and active organic matter, raised the Kos value, In the long-term application of chemical fertilizers, the increase of organic matter in topsoil was small, the contents of organic matter in hard-to-oxidize soil increased, Kos increased and the content of tight-junction humus increased