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有机肥部分替代化肥对桃园N2O和NO排放的影响
摘要点击 842  全文点击 111  投稿时间:2023-06-05  修订日期:2023-09-08
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中文关键词  果园  有机肥  氧化亚氮(N2O)  一氧化氮(NO)  硝化作用  反硝化作用
英文关键词  orchard  organic fertilizer  N2O  NO  nitrification  denitrification
作者单位E-mail
徐品上 南京农业大学资源与环境科学学院, 农业农村部东南沿海农业绿色低碳重点实验室, 南京 210095 2020203075@stu.njau.edu.cn 
郭姝敏 南京农业大学资源与环境科学学院, 农业农村部东南沿海农业绿色低碳重点实验室, 南京 210095  
郑皓晨 南京农业大学资源与环境科学学院, 农业农村部东南沿海农业绿色低碳重点实验室, 南京 210095  
王金阳 南京农业大学资源与环境科学学院, 农业农村部东南沿海农业绿色低碳重点实验室, 南京 210095 jywang@njau.edu.cn 
邹建文 南京农业大学资源与环境科学学院, 农业农村部东南沿海农业绿色低碳重点实验室, 南京 210095  
中文摘要
      有机肥替代作为一种减肥增效和多元化肥替代技术在农业生产中被大力推广.然而,目前尚缺乏对于有机肥在果园N2 O和NO排放方面的影响综合评估.采用静态暗箱-气相色谱法,周年观测桃园种植过程中N2 O和NO的排放,比较了单施化肥和有机肥部分替代化肥处理对桃园氮氧化物排放的影响.结果表明,有机肥部分替代化肥分别降低桃园N2 O和NO排放总量15.0 %和9.4 %,同时 N2 O和NO排放系数降低21.3 %和21.1 %.有机肥处理土壤的矿质氮含量低于单施化肥处理.有机肥处理提高了硝化作用中AOA的贡献,降低AOB的贡献,从而减少了硝化作用产生的N2 O.此外,双同位素混合模型[δ18O(N2 O/H2 O)vs.δ15NSP]结果表明,硝化细菌反硝化/细菌反硝化(bD/nD)是桃园土壤N2 O排放的主要途径.施用有机肥增强了土壤反硝化作用,导致更多的N2 O和NO被还原.因此,有机肥部分替代可以缓解果园氮氧化物排放,是实现农业绿色低碳的可行措施.
英文摘要
      Organic fertilizer substitution has been promoted as a weight loss, efficient, and diversified fertilizer substitution technology in agricultural production. However, there is a lack of comprehensive assessment of the impact of organic fertilizers on N2O and NO emissions from orchards. In this study, N2O and NO emissions from peach orchards were observed annually using static dark box-gas chromatography to compare the effects of chemical fertilizer application alone and partial replacement of chemical fertilizer treatment on NO emissions from peach orchards. The results showed that the partial replacement of chemical fertilizers with organic fertilizers reduced the total N2O and NO emissions from peach orchards by 15.0 % and 9.4 %, respectively. The N2O and NO emission factors were reduced by 21.3 % and 21.1 %. The mineral N content of the soil in the organic fertilizer treatment was lower than that in the chemical fertilizer treatment alone. The organic fertilizer treatment increased the contribution of AOA to nitrification and decreased the contribution of AOB, thus reducing N2O and NO from nitrification. In addition, the results of the dual isotope mixing model[δ18O(N2O/H2O) vs. δ15NSP] indicated that the bacterial denitrification/nitrifying bacterial denitrification (bD/nD) process served as the primary pathway for N2O emissions in peach orchards. Partial substitution with organic fertilizers enhanced soil denitrification, resulting in larger reductions in the amounts of N2O and NO. Therefore, partial substitution of organic fertilizer is a viable measure to mitigate nitrogen oxide emissions from orchards and to achieve green and low-carbon development in agriculture.

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