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Organic substitution stimulates ammonia oxidation-driven N2O emissions by distinctively enriching keystone species of ammonia-oxidizing archaea and bacteria in tropical arable soils

文献类型： 外文期刊

作者： Zhang, Qi 1 ; Chen, Miao 2 ; Leng, Youfeng 2 ; Wang, Xiaotong 1 ; Fu, Yajun 1 ; Wang, Danfeng 2 ; Zhao, Xiongwei 1 ; Gao, Wenlong 2 ; Li, Ning 2 ; Chen, Xin 2 ; Fan, Changhua 2 ; Li, Qinfen 2 ;

作者机构： 1.Hainan Univ, Coll Ecol & Environm, Haikou 570228, Peoples R China

2.Chinese Acad Trop Agr Sci, Environm & Plant Protect Inst, Hainan Key Lab Trop Ecocircular Agr, Haikou 571101, Peoples R China

3.Hainan Danzhou Trop Agroecosyst Natl Observat & Re, Danzhou 571737, Peoples R China

4.Minist Agr & Rural Affairs, Key Lab Green & Low Carbon Agr Trop China, Haikou 571101, Peoples R China

5.Guizhou Minzu Univ, Coll Ecoenvironm Engn, Guiyang 550025, Peoples R China

6.Huazhong Agr Univ, Coll Resources & Environm, Wuhan 430070, Peoples R China

7.Chinese Acad Trop Agr Sci, Haikou 571101, Hainan, Peoples R China

关键词： Ammonia oxidation; Partial organic substitution; Nitrous oxide; Community structure; Tropical arable soil

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：9.8； 五年影响因子：9.6 ）

ISSN： 0048-9697

年卷期： 2023 年 872 卷

页码：

收录情况： SCI

摘要： Partial organic substitution (POS) is pivotal in enhancing soil productivity and changing nitrous oxide (N2O) emissions by profoundly altering soil nitrogen (N) cycling, where ammonia oxidation is a fundamental core process. However, the regulatory mechanisms of N2O production by ammonia oxidizers at the microbial community level under POS re-gimes remain unclear. This study explored soil ammonia oxidation and related N2O production, further building an understanding of the correlations between ammonia-oxidizing archaea (AOA) and ammonia-oxidizing bacteria (AOB) activity and community structure in tropical arable soils under four-year field management regimes (CK, with-out fertilizer N; N, with only inorganic N; M1N1, with 1/2 organic N + 1/2 inorganic N; M1N2, with 1/3 organic N + 2/3 inorganic N). AOA contributed more to potential ammonia oxidation (PAO) than AOB across all treatments. In comparison with CK, N treatment had no obvious effects on PAO and lowered related N2O emissions by decreasing soil pH and downregulating the abundance of AOA-and AOB-amoA. POS regimes significantly enhanced PAO and N2O emissions relative to N treatment by promoting the abundances and contributions of AOA and AOB. The stimulated AOA-dominated N2O production under M1N1 was correlated with promoted development of Nitrososphaera. By con-trast, the increased AOB-dominated N2O production under M1N2 was linked to the enhanced development of Nitrosospira multiformis. Our study suggests organic substitutions with different proportions of inorganic and organic v

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