Elevated atmospheric CO2 promotes the contribution of autotrophic nitrification to N2O emissions in a typical summer maize field
文献类型： 外文期刊
作者： Ma, Fen 1 ; Li, Yingchun 1 ; Liu, Ying 1 ; Dong, Libing 1 ; Han, Xue 1 ; Zhang, Xinyue 1 ; Li, Kuo 1 ; Guo, Liping 1 ;
作者机构： 1.Chinese Acad Agr Sci, Inst Environm & Sustainable Dev Agr, Key Lab Agroenvironm, Minist Agr & Rural Affairs, Beijing 100081, Peoples R China
2.Shanxi Agr Univ, Coll Agr, Shanxi 071001, Peoples R China
关键词： N2O production pathways; Autotrophic nitrification; Microbial functional genes; Climate change; Elevated atmospheric CO2; N-15 tracing
期刊名称：EUROPEAN JOURNAL OF AGRONOMY （ 影响因子：5.2； 五年影响因子：5.9 ）
ISSN： 1161-0301
年卷期： 2024 年 153 卷
页码：
收录情况： SCI
摘要： Elevated atmospheric carbon dioxide (CO2) concentration generally stimulates nitrous oxide (N2O) emissions from upland soils, leading to a promoted feedback on climate change. However, the underlying mechanisms on how elevated CO2 (eCO(2)) stimulates N2O emissions from nitrogen (N)-fertilized upland soils remain poorly known. Here, we investigated the effects of eCO(2) on soil N2O production pathways and associated gross N transformation rates, as well as on nitrifying and denitrifying microbes. Based on a 13 years of free-air CO2 enrichment (FACE) platform, we found that N2O emissions were significantly increased by 46.7% under eCO(2) in a typical summer-maize field. The N-15 tracing experiment showed that autotrophic nitrification rate was significantly increased by 11.6% under eCO(2), coincided with the significantly higher abundance and shift composition of ammonia-oxidizing bacteria (AOB) under eCO(2). Also, eCO(2) enhanced gross ammonium (NH4+) immobilization rate but reduced gross nitrate (NO3-) immobilization rate. Autotrophic nitrification accounted for approximately 78% of N2O emissions, followed by heterotrophic nitrification (about 19%) and denitrification (about 3%). It was found that eCO(2) increased carbon (C) deposition in soil, which could affect the availability of soil labile organic C and N and alter the composition and activity of nitrifiers. These changes promoted the N2O production derived from autotrophic nitrification, resulting in higher N2O emissions under eCO(2). We could deduce that nitrifier denitrification contributed to the increased N2O emissions greatly under eCO(2), derived by strongly stimulated ammonia oxidation and microbial respiration (i.e. higher soil CO2 emissions) caused suboxic conditions (i.e. lower soil oxygen (O-2) concentration), along with higher abundance ratios of (nirK+nirS)/nosZ. Our results suggest that controlling autotrophic nitrification appropriately is crucial for mitigating N2O emissions from upland soils under rising atmospheric CO2 concentration.
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