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采用长期淹水密闭——间歇淋洗培养方法和分析手段,研究了辽河平原地区连续16年长期不同施肥(不施氮肥、氮肥、氮肥+有机肥、氮肥+有机肥+放萍)水稻土氮素的矿化过程。结果表明长期不同施肥水稻土氮矿化量为N15.61～103.57mgkg-1,为全N的1.25%～5.66%;氮肥+有机肥处理土壤氮矿化量最高,占全氮比率最大,而氮肥处理土壤氮矿化量最低,占全氮的比率最小;氮矿化量与全氮、有机质、C/N之间呈显著相关关系(P<0.05)。选择有效积温式(EATM);一级反应式(One-pool模型);带常数项的一级反应式(Special模型),对实验数据进行拟合。非线性拟合结果表明Special模型明显优于One-pool模型和有效积温式(EATM)。分析表明Special模型能更为准确地描述长期不同施肥措施下水稻土有机氮素的矿化。
Using long-term flooding airtight-intermittent leaching culture method and analysis method, the effects of long-term fertilization (no nitrogen fertilizer, nitrogen fertilizer, nitrogen fertilizer + organic fertilizer, nitrogen fertilizer + organic fertilizer + The mineralization process. The results showed that the long-term different fertilization paddy soil nitrogen mineralization amount of N15.61 ~ 103.57mgkg-1, for all N 1.25% ~ 5.66%; nitrogen + organic fertilizer soil nitrogen mineralization highest, accounting for the highest total nitrogen ratio, and Nitrogen mineralization had the lowest content of nitrogen mineralization and the lowest percentage of total nitrogen. Nitrogen mineralization had a significant correlation with total nitrogen, organic matter and C / N (P <0.05). The EATM, the first-order reaction (One-pool model), and the first-order reaction (the special model) with the constant term were selected to fit the experimental data. The non-linear fitting results show that the Special model is significantly better than the One-pool model and the effective temperature-accumulated (EATM) model. The analysis shows that Special model can describe the mineralization of organic nitrogen in paddy soils under different fertilization practices more accurately.