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

• DOI: 10.1111/ejss.13494
• Publication Date: 2024-05-23T01:14:55Z
• Authors: Cheng Ji; Jidong Wang; Yuxiang Sun; Cong Xu; Jie Zhou; Yuehua Zhong; Yunwang Ning; Hui Zhang; Yongchun Zhang; Yinglong Chen
• Keywords: Microbial consortium

Abstract Straw‐decomposing microbial inoculants (MIs) have been increasingly applied to straw‐amended soils. However, the interactive effects and underlying mechanisms of straw decomposing MIs on nitrous oxide (N 2 O) emissions remain unclear. Here, a pot experiment with an Aquic Inceptisol was conducted determine soil N O abundance composition functional genes under six amendments: wheat (W), Bacillus subtilis MI (B), Streptomyces rochei (S), combination B. (WB), S. (WS), control without or (C). Compared control, amendments straw, MIs, their combinations decreased by 43%, 22–30%, 46–60%, respectively. Mechanistically, positive relationship between ammonia‐oxidizing bacteria (AOB) potential nitrification rate (PNR), along AOB (−36%) following amendments, further suggested that predominated responsible for suppressed nitrification. In addition, amendment increased nirK gene (by 48%) denitrification 11%), while increase in nosZI (+25%) involved consumption contributed decrease emissions. Overall, additive effect associated two amendment‐induced changes straw‐stimulated gene. Our results revealed mitigating influencing O‐related groups.