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通过8年定位试验,研究了不同施肥制度下褐土结合态腐殖质动态变化规律。结果表明,不同施肥制度主要影响松结态腐殖质碳含量,对稳结态和紧结态的影响较小。采用有机肥(物)料配施常量NPK化肥,土壤有机碳和结合态腐殖质碳表现为以递减速率持续上升;不施肥和单施常量NPK化肥则造成土壤有机碳和结合态腐殖质碳不断降低,其下降速率亦表现为递减。在试验的不同阶段,土壤有机碳的亏损或盈余向结合态腐殖质碳分配比例的变化态势各异,不施肥处理随时间的延长渐增,而施用有机肥(物)料配施化肥则呈相反趋势。
Through 8-year experiment, the dynamic changes of bound humus in different fertilization systems were studied. The results showed that different fertilization systems mainly affected the loosely-conditioned humus carbon content, and had little effect on the steady-state and the tight-junction state. With the application of organic fertilizers and NPK fertilizers, the contents of soil organic carbon and bound humus carbon increased continuously with decreasing rates. However, no fertilization and application of NPK fertilizers resulted in the continuous decrease of soil organic carbon and bound humus carbon, Its rate of decline is also shown as decreasing. At different stages of the experiment, the changes in the proportions of soil organic carbon loss or surplus to the bound humus carbon were different, and no fertilization treatment increased with time, while the application of organic fertilizer and fertilizers was the opposite trend.