长期培肥过程中塿土物理性质演变规律

Evolution Laws of Physical Properties in Lou Soil with Long-term Fertilization

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。

The experiment systematically analyzed particle density, bulk density, porosity, aggregate and stability of aggregate in a long-term fertilizing, designed to study the effect of different fertilization treatments on soil physical properties. The results showed that in the long-term unfertilized soil, its organic matter content and its physical properties remained at their original and fundamental level. The addition of fertilized soils generally improved their physical properties. Fertilization organic straw resulted in an increase in soil organic matter and porosity. In contrast, both particle density and bulk density decreased. Fertilization also promoted aggregate production, especially the amount of >0.25mm water stable aggregates. The stability of aggregates also increased. The soil structure deteriorated significantly in the continuous fallow treatment.