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通过连续 8年定位试验 ,研究了不同施肥方式下土壤有机质氧化稳定性的动态变化及其与作物产量和肥力水平的关系。结果表明 ,长期不施肥或施用常量N、P、K化肥 ,使土壤易氧化有机质含量明显下降 ,进而引起土壤有机质总量减少 ,氧化稳定系数 (Kos)升高 ,土壤供肥能力降低 ;连续施用增量N、P、K化肥 ,可使土壤有机质及Kos值保持稳定 ,但投入成本较高 ;长期施用有机肥 (物 )料配施常量N、P、K化肥 ,可明显提高土壤易氧化有机质含量和有机质总量 ,降低其Kos值 ,土壤对养分的供、贮能力增强 ,肥力提高 ,同时其作物产量显著高于增量N、P、K化肥处理。不同施肥方式主要影响土壤易氧化有机质含量 ,对难氧化有机质的影响较小
Through the continuous 8-year experiment, the dynamic changes of the oxidation stability of soil organic matter and their relationship with the crop yield and fertility under different fertilization modes were studied. The results showed that the long-term non-fertilization or application of N, P and K fertilizers resulted in a significant decrease of soil organic matter content, which led to the decrease of total organic matter content, the increase of oxidation stability coefficient (Kos) and the decrease of soil fertility. Increasing N, P and K fertilizers could stabilize soil organic matter and Kos value, but the input cost was relatively high. Long-term application of organic fertilizers combined with constant N, P and K fertilizers could significantly increase soil organic matter Content and total organic matter, decreased its Kos value, soil nutrient supply and storage capacity increased, fertility increased, while its crop yield was significantly higher than the incremental N, P, K fertilizer treatment. Different modes of fertilization mainly affected soil organic matter content and less affected the organic matter