Mitigation of N2O emissions in water-saving paddy fields:Evaluating organic fertilizer substitution and microbial mechanisms

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外文摘要：Water-saving irrigation strategies can successfully alleviate methane emissions from rice fields,but significantly stimulate nitrous oxide(N2O)emissions because of variations in soil oxygen level and redox potential.However,the relationship linking soil N2O emissions to nitrogen functional genes during various fertilization treatments in water-saving paddy fields has rarely been investigated.Furthermore,the mitigation potential of organic fertilizer substitution on N2O emissions and the microbial mechanism in rice fields must be further elucidated.Our study examined how soil N2O emissions were affected by related functional microorganisms(ammonia-oxidizing archaea(AOA),ammonia-oxidizing bacteria(AOB),nirS,nirK and nosZ)to various fertilization treatments in a rice field in southeast China over two years.In this study,three fertilization regimes were applied to rice cultivation:a no nitrogen(N)(Control),an inorganic N(Ni),and an inorganic N with partial N substitution with organic manure(Ni+No).Over two rice-growing seasons,cumulative N2O emissions averaged 0.47,4.62 and 4.08 kg ha-1 for the Control,Ni and Ni+N.treatments,respectively.In comparison to the Ni treatment,the Ni+N.fertilization regime considerably reduced soil N2O emissions by 11.6％while maintaining rice yield,with a lower N2O emission factor(EF)from fertilizer N of 0.95％.Nitrogen fertilization considerably raised the AOB,nirS,nirK and nosZ gene abundances,in comparison to the Control treatment.Moreover,the substitution of organic manure for inorganic N fertilizer significantly decreased AOB and nirS gene abundances and increased nosZ gene abundance.The AOB responded to N fertilization more sensitively than the AOA.Total N2O emissions significantly correlated positively with AOB and nirS gene abundances while having a negative correlation with nosZ gene abundance and the nosZInirS ratio across N-fertilized plots.In summary,we conclude that organic manure substitution for inorganic N fertilizer decreased soil N2O emissions primarily by changing the soil NO3--N,pH and DOC levels,thus inhibiting the activities of ammonia oxidation in nitrification and nitrite reduction in denitrification,and strengthening N2O reduction in denitrification from water-saving rice paddies.

作者：

Delei Kong、Xianduo Zhang、Qidong Yu、Yaguo Jin、Peikun Jiang、Shuang Wu、Shuwei Liu、Jianwen Zou

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作者单位：

College of Environment and Resources/College of Carbon Neutrality,Zhejiang A&F University,Hangzhou 311300,China

Jiangsu Key Laboratory of Low Carbon Agriculture and GHGs Mitigation,College of Resources and Environmental Sciences,Nanjing Agricultural University,Nanjing 210095,China

Department of Biochemistry and Molecular Biology,College of Life Sciences,Nanjing Agricultural University,Nanjing 210095,China

Jiangsu Key Lab and Engineering Center for Solid Organic Waste Utilization,Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization,Nanjing Agricultural University,Nanjing 210095,China

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基金：

National Key Research and Development Program of ChinaNational Natural Science Foundation of ChinaScientific Research Foundation of Zhejiang A&F University,ChinaJiangsu Agriculture Science and Technology Innovation Fund,China

项目编号：

2022YFD2300300419070722022LFR003CX213007

出版年：

2024

DOI：

10.1016/j.jia.2024.03.047

参考文献

农业科学学报(英文)

CSTPCD

影响因子：0.576

ISSN：2095-3119

年,卷(期)：2024.23(9)

Delei Kong,Xianduo Zhang,Qidong Yu,et al.Mitigation of N2O emissions in water-saving paddy fields:Evaluating organic fertilizer substitution and microbial mechanisms[J].农业科学学报(英文),2024,23(9):3159-3173.DOI:10.1016/j.jia.2024.03.047.

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