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通过8年定位试验,研究了长期不同施肥制度下土壤有机质质量动态变化规律。结果表明,采用有机肥(物)料配施常量NPK化肥,土壤有机碳、易氧化有机碳、腐殖酸碳及其占总有机碳比率、HAC、FAC和HAC/FAC不断提高,Kos持续下降,其变化速率表现为递减;长期不施肥和单施常量NPK化肥则造成Kos持续上升,其余指标以递减速率下降。不同施肥制度下土壤有机质质量指标的动态变化可利用渐近函数模拟。在试验的不同阶段,土壤腐殖酸碳总量的亏损或盈余向HAC分配比例的变化态势各异,长期不施肥处理随时间的延长渐减,单施常量NPK化肥处理基本上分配至HAC;有机肥(物)料配施化肥则呈现出后期>前期>中期的趋势。
Through 8-year experiment, the dynamic changes of soil organic matter under long-term fertilization were studied. The results showed that the ratio of organic carbon, organic carbon, humic acid and total organic carbon in the NPK fertilizer, HAC, FAC and HAC / FAC were increased with the application of organic fertilizer , And its rate of change showed decreasing; long-term non-fertilization and single application of NPK fertilizer caused Kos continued to rise, and the remaining indicators decreased at a decreasing rate. The dynamic changes of soil organic matter quality index under different fertilization systems can be simulated by asymptotic function. At different stages of the experiment, the distribution of loss or surplus of total humic acid carbon to HAC varied in different ways. The long-term non-fertilization decreased gradually with the prolongation of time. The treatment with NPK fertilizer was basically distributed to HAC. Organic fertilizer (material) with fertilizer application showed a trend of late> early> mid-term.