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Fertilizer N triggers native soil N-derived N2O emissions by priming gross N mineralization

文献类型： 外文期刊

作者： Xu, Cong 1 ; Zhu, Hanshen 1 ; Wang, Jing 2 ; Ji, Cheng 1 ; Liu, Yaobin 1 ; Chen, Danyan 4 ; Zhang, Hui 1 ; Wang, Jidong 1 ; Zhang, Yongchun 1 ;

作者机构： 1.Jiangsu Acad Agr Sci, Inst Agr Resources & Environm, Natl Agr Expt Stn Agr Environm, Nanjing 210014, Peoples R China

2.Nanjing Forestry Univ, Coll Forestry, Coinnovat Ctr Sustainable Forestry Southern China, Nanjing 210037, Peoples R China

3.Jiangsu Univ, Sch Environm & Safety Engn, Zhenjiang 212013, Peoples R China

4.Jinling Inst Technol, Coll Hort, Nanjing 210038, Peoples R China

5.Jiangsu Acad Agr Sci, 50 Zhonglingjie St, Nanjing 210014, Jiangsu, Peoples R China

关键词： Nitrous oxide; 15N tracing; Priming effect; Gross nitrogen transformation; Nitrification

期刊名称：SOIL BIOLOGY & BIOCHEMISTRY （ 影响因子：9.7； 五年影响因子：10.2 ）

ISSN： 0038-0717

年卷期： 2023 年 178 卷

页码：

收录情况： SCI

摘要： Recent 15nitrogen (N) tracing studies have shown that unlabeled N2O emissions (UNEs) following 15N fertilizer application tend to be higher than those from zero-N controls, which indicates a potential risk for elevated N2O emissions from native soil. However, researchers do not clearly understand whether these increased UNEs are derived from a priming effect or how interactions between N in fertilizer and native soil affect various sources of N2O emissions. Here, we combined 15N tracing and 15N pool dilution in an incubation study to track gross N transformations, specific sources of N2O emissions, and N2O-production pathways following N fertilization. Four treatments, including two fertilizer N levels (0 and 120 mg N kg(-1)) in conjunction with two native soil N levels (0.56 and 1.25 g kg(-1)), were established in the study. Soil gross N mineralization (GM) increased by 33.0%- 98.5% (4.59-14.97 mg N kg(-1)) after N fertilizer addition, which indicated a positive priming effect on soil N turnover and resulted in additional native soil N-derived N2O emissions. In addition to priming GM, the pool substitution effect after 15N addition, which was not triggered by stimulated soil N turnover, also generated substrates for the UNEs. Therefore, overlooking the pool substitution effect might overestimate native soil N-derived emissions by 104%-180%. Differentiation of the specific N2O emission sources showed that both the fertilizer N-and primed native soil N-derived N2O emissions were dominated by nitrifier-mediated processes, which were governed by ammonia-oxidizing bacteria. At a specified N fertilizer addition rate, soils with higher native N levels had greater levels of fertilizer N-and native soil N-derived N2O emissions due to the higher GM and gross nitrification rates. The study reveals that fertilizer N application triggers potential N2O emissions from native soil N by stimulating the GM and nitrifier-mediated N2O-production processes.

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