依托长期定位试验(从1990年开始)的4个施肥处理(CK,不施肥;M,循环猪圈肥;NPK,单施化肥;NPK+M,化肥配施循环猪圈肥),探讨了长期施肥对潮棕壤有机氮各组分的影响并揭示了其年际变化特征.结果表明:从试验开始至2015年,不同施肥模式下各有机氮组分呈现不同的变化趋势,其中酸解有机氮基本上表现为逐年增加的趋势;M和NPK+M处理氨基酸态氮也逐年上升,而CK和NPK处理氨基酸态氮持续下降,这可能与微生物对土壤中氨基酸的利用有关.在整个试验过程中(1990—2015年的平均值),NPK处理酸解铵态氮大幅度增加,比CK增加31.1%;在施加有机肥的2个处理中(M和NPK+M)有机氮各组分均有所提高.与M相比,NPK+M处理各有机氮组分增加的幅度更加明显,这表明有机无机肥配施能有效增加土壤有机氮,进而增强土壤供氮能力,提高土壤肥力水平. Relying on four fertilization treatments (CK, no fertilization; M, recirculating piggery; NPK, single chemical fertilizer; NPK + M and chemical fertilizer combined cycle pigmentation) under the long-term experiment The results showed that from the beginning of the experiment to 2015, the contents of organic nitrogen in different fertilization modes showed different trends. Among them, the content of organic nitrogen On the other hand, it showed a trend of increasing year by year; amino nitrogen in M ​​and NPK + M also increased year by year, whereas amino nitrogen in CK and NPK continued to decrease, which may be related to the use of amino acids in soil by microorganisms.In the whole experiment 1990-2015), NPK treatment significantly increased the content of NH 4 + -N, which was 31.1% higher than CK. In the two treatments (M and NPK + M) Compared with the M, NPK + M treatment of organic nitrogen components increased more significantly, indicating that organic and inorganic fertilizer can effectively increase soil organic nitrogen, thereby enhancing soil nitrogen supply and increase soil fertility levels.