有机肥对石灰性土壤肥力属性的长期影响

用常规化学分析和差热分析方法研究了长期不同施肥模式下有机肥对土壤生态肥力的影响。结果表明,长期施用有机肥(厩肥、高秸处理)可显著提高土壤有机碳含量,其水散性G0复合体减少;水稳性G1、G2复合体增加,3种胶散复合体的有机碳含量提高,重组复合体中活性强的松结合态腐殖质较多。施入有机肥不仅可提高土壤有机无机复合体的总能量水平,而且也能提高复合体中松结态、稳结态、紧结态腐殖质的能态。高秸、厩肥处理的原土、重组、稳紧态复合体、紧结态复合体和3种胶散复合体焓变值较高,具有较高能态。施用有机肥的土壤全氮、全磷、重组磷及C/N比均呈提高趋势,pH值降低,其原土和重组复合体的阳离子交换量较高。

Long- term effects of organic manure on the fertility properties of calcareous soil

The complexes with differently combined humic substance and organo-mineral complexes were investigated using two ways of analysis,which was general analysis on common chemical properties and thermo analysis on thermodynamic properties.The results showed that using organic matter in a long-term obviously raised the contents of organic carbon,with the amount of water-scattered complex ( G0 fraction) descended,while water-stable complex (Gl,G2 fraction) raised.With the application of organic manure,the content of organic carbon in three kinds of colloid-combined complexes and loose-combined carbon in its heavy fraction were increased.The organic manure could not only improve the total energy level (higher level of enthalpy) of soil organo-mineral complexes,but also improve the energy level of loose,stable and tightly-combined humic.Organic manure also had influence on common soil fertility parameters,i.e.the contents of total nitrogen,total phosphorus,content of exchangeable cation(CEC) and C/N specific ratio were all improved.