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Wheat straw and microbial inoculants have an additive effect on N2O emissions by changing microbial functional groups

文献类型： 外文期刊

作者： Ji, Cheng 1 ; Wang, Jidong 1 ; Sun, Yuxiang 1 ; Xu, Cong 1 ; Zhou, Jie 4 ; Zhong, Yuehua 1 ; Ning, Yunwang 1 ; Zhang, Hui 1 ; Zhang, Yongchun 1 ; Chen, Yinglong 5 ;

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

3.Nanjing Agr Univ, Coll Resources & Environm Sci, Nanjing, Peoples R China

4.Nanjing Agr Univ, Coll Agr, Nanjing, Peoples R China

5.Univ Western Australia, UWA Inst Agr, Perth, Australia

6.Univ Western Australia, Sch Agr & Environm, Perth, Australia

关键词： microbial gene abundance; microbial inoculant; nitrous oxide; straw

期刊名称：EUROPEAN JOURNAL OF SOIL SCIENCE （ 影响因子：4.2； 五年影响因子：4.7 ）

ISSN： 1351-0754

年卷期： 2024 年 75 卷 3 期

页码：

收录情况： SCI

摘要： Straw-decomposing microbial inoculants (MIs) have been increasingly applied to straw-amended soils. However, the interactive effects and underlying microbial mechanisms of straw and decomposing MIs on nitrous oxide (N2O) emissions remain unclear. Here, a pot experiment with an Aquic Inceptisol was conducted to determine soil N2O emissions and the abundance and composition of microbial functional genes under six amendments: wheat straw (W), Bacillus subtilis MI (B), Streptomyces rochei MI (S), a combination of straw and B. subtilis MI (WB), a combination of straw and S. rochei MI (WS), and a control without wheat straw or MI (C). Compared with the control, the amendments of straw, decomposing MIs, and their combinations decreased soil N2O emissions by 43%, 22-30%, and 46-60%, respectively. Mechanistically, the positive relationship between ammonia-oxidizing bacteria (AOB) and soil potential nitrification rate (PNR), along with decreased AOB abundance (-36%) following straw and decomposing MI amendments, further suggested that AOB predominated soil nitrification and was responsible for the suppressed nitrification. In addition, straw amendment increased nirK gene abundance (by 48%) and potential denitrification rate (by 11%), while the increase in nosZI gene abundance (+25%) involved in N2O consumption contributed to the decrease in N2O emissions. Overall, the additive effect of straw and decomposing MIs on soil N2O emissions was associated with two amendment-induced changes in the abundance and composition of AOB and straw-stimulated the abundance of the nosZI gene. Our results revealed the potential for mitigating N2O emissions following the amendments of straw and MI by influencing soil N2O-related microbial groups.

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