长期不同施肥处理对土壤氮素矿化特性的影响

发布时间：2018-04-06 21:21

本文选题：长期施肥　切入点：土壤　出处：《西北农林科技大学学报(自然科学版)》2017年02期

【摘要】：【目的】了解长期不同施肥处理土壤的供氮能力,从而为确定合适的氮肥用量提供理论依据。【方法】采用间歇淋洗好气培养法,研究小麦-休闲轮作下长期不同施肥处理(No-F.20年不施肥处理;NPK.20年施用NPK肥处理;MNPK.20年有机肥与NPK肥配施处理)土壤0~20,20~40和40~60cm土层土壤氮素矿化特性。【结果】与NPK处理相比,MNPK处理明显提高了0~20和20~40cm土层土壤有机碳、全氮、氮素矿化累积量和氮素矿化势(N0);与No-F处理相比,MNPK处理明显提高了0~60cm土层土壤氮素矿化累积量和氮素矿化势。3种施肥处理下,0~20,20~40,40~60cm土层N0占土壤全氮的比例分别为19%~23%,9%~12%,6%;各土层中MNPK处理下该比例值均最高。0~20,20~40和40~60cm土层氮素矿化累积量分别占0~60cm土层的62%~71%,20%~27%和9%~12%。不同施肥处理中,MNPK处理0~20cm土层氮素矿化累积量占0~60cm土层的比例最高。【结论】有机肥与无机肥长期配施明显提高了0~60cm土层土壤供氮能力。
[Abstract]:[Objective] to understand the ability of soil nitrogen fertilization, so as to provide a theoretical basis for determining the appropriate amount of nitrogen fertilizer. [method] the intermittent leaching aerobic incubation method of wheat fallow under long-term fertilization (No-F.20 no fertilization; NPK.20 NPK fertilizer and organic fertilizer treatment; MNPK.20 NPK fertilizer treatment) of soil 0~20,20~40 and 40~60cm soil nitrogen mineralization characteristics. [results] compared with NPK treatment, MNPK treatment significantly increased 0~20 and 20~40cm soil organic carbon, total nitrogen, nitrogen mineralization accumulation and nitrogen mineralization potential (N0); compared with No-F treatment, MNPK treatment significantly increased in 0~60cm soil layer nitrogen accumulation and nitrogen mineralization potential.3 fertilizer treatments, soil 0~20,20~40,40~60cm N0 percentage of total nitrogen in soil were 19%~23%, 9%~12%, MNPK 6%; the soil in the proportion .0~20,20~40 and 40~60cm are the highest soil nitrogen mineralization accumulation accounted for 0~60cm of soil 62%~71%, 20%~27% and 9%~12%. in different treatments, MNPK treatment of soil nitrogen mineralization accumulation in 0~20cm 0~60cm soil layer accounted for the highest proportion. [Conclusion] the organic fertilizer and inorganic fertilizer can significantly improve the long-term application of nitrogen for 0~60cm soil.

【作者单位】：西北农林科技大学资源环境学院/农业部西北植物营养与农业环境重点实验室;渭南市农业技术推广中心;青岛农业大学资源环境学院;
【基金】：国家自然科学基金项目(31372137) 国家“十二五”科技支撑计划项目(2012BAD15B04)
【分类号】：S153.6

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