长期施肥对潮棕壤有机氮组分的影响

发布时间：2018-11-20 18:59

【摘要】：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.
[Abstract]:Four fertilization treatments based on long-term localizing test (from 1990) (CK, without fertilization; M, circulating pig manure; NPK, single fertilizer application; The effects of long-term fertilization on organic nitrogen components in tidal brown soil were studied and their interannual variation characteristics were revealed. The results showed that: from the beginning of the experiment to 2015, the organic nitrogen components under different fertilization patterns showed different trends, among which the acidolysis organic nitrogen showed a trend of increasing year by year. The amino acid nitrogen of M and NPK M treatments also increased year by year, while the amino acid nitrogen of CK and NPK treatments decreased continuously, which may be related to the utilization of amino acids in soil by microorganisms. During the whole experiment (the average value of), NPK from 1990 to 2015), the ammonium acidolysis nitrogen increased significantly, which was 31. 1% higher than that of CK, and the organic nitrogen components (M and NPK M) were increased in the two treatments with organic fertilizer. Compared with M, the increase of organic nitrogen components in, NPK M treatment was more obvious, which indicated that combined application of organic and inorganic fertilizer could effectively increase soil organic nitrogen, thus enhance soil nitrogen supply capacity and soil fertility level.
【作者单位】：中国科学院沈阳应用生态研究所;中国科学院大学;
【基金】：国家科技部支撑计划项目(2012BAD05B01) 国家自然科学基金项目(41471250,41301326)资助~~
【分类号】：S158

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