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通过对长期培肥试验田不同处理土壤的比重、容重、孔隙度、团聚体等物理性质的系统分析,企图揭示在长期培肥过程中土壤物理性质演变规律。研究结果表明:未进行培肥作用的土壤(对照)小区仍维持着原来土壤有机质含量水平,该试验小区土壤所具有的是最基础的物理性质,其它不同培肥处理的土壤比重和容重均随有机质积累而明显减小,孔隙度随土壤有机质含量增加而升高。不同培肥措施都明显地促进土壤大团聚体的形成,特别是增加了>0.25mm水稳性团聚体的含量,降低了团聚体破坏率,逐渐地改善了土壤物理性质。在常年休闲过程中土壤结构性能明显地被破坏。
Through the systematic analysis of the physical properties such as specific gravity, bulk density, porosity and aggregates of different treatments in long-term fertilization experiment field, attempts to reveal the evolution of soil physical properties during long-term fertilization were conducted. The results showed that: the soil (control) plot without any fertilizing effect still maintained the original soil organic matter content. The soil in this plot had the most basic physical properties. The soil specific gravity and bulk density The accumulation of organic matter decreased obviously, and the porosity increased with the increase of soil organic matter content. Different fertilizer treatments significantly promoted the formation of soil aggregates, especially increasing the content of> 0.25mm water-stable aggregates, reducing the rate of aggregates destruction and gradually improving the soil physical properties. Soil structural properties are clearly destroyed during the annual recreation.