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通过8年定位试验,研究了不同施肥制度下褐土及其微团聚体磷素肥力变化规律,从各级微团聚体全磷和有效磷储量角度探讨了不同施肥制度下土壤磷素肥力的变化实质。结果表明,不施肥处理主要是由于10～50μm粒级全磷储量和<10μm粒级有效磷储量减少而造成土壤磷素肥力下降;单施常量NPK化肥和增量NPK化肥处理主要通过提高<10μm粒级全磷和有效磷储量增加土壤磷素含量;有机肥(物)料配施常量NPK化肥处理则在提高小粒级微团聚体磷素贮备和供应能力的同时,增强了大粒级特别是10～50μm粒级全磷和有效磷储量,进而使土壤磷素肥力得到提高。采用有机肥(物)料配施常量NPK化肥是改善土壤磷素肥力的有效措施。
Through 8-year experiment, the variation of phosphorus fertility of cinnamon soil and its micro-aggregates under different fertilization regimes was studied. The changes of soil phosphorus fertilizers under different fertilization regimes were discussed from the perspective of total phosphorus and available phosphorus reserves of micro-aggregates at all levels. substance. The results showed that the non-fertilization treatments were mainly due to the reduction of P fertility in 10 ~ 50μm fractions of total phosphorus reserves and the <10μm fraction of available P fractions. The application of NPK fertilizers and NPK fertilizers increased by <10μm Particle size of total phosphorus and available phosphorus increased soil phosphorus content; organic fertilizer (material) with a combination of NPK fertilizer treatment is to improve small particle size micro-aggregate phosphorus storage and supply capacity, while enhancing the large particle size, especially 10 ~ 50μm grain size of total phosphorus and available phosphorus reserves, thereby increasing soil phosphorus fertility. The use of organic fertilizer (material) with a constant NPK fertilizer is an effective measure to improve soil phosphorus fertility.