The responses of cbbL-carrying bacteria to different levels of soil carbon saturation deficits (SCSD) under tillage managements are largely unknown. We assessed the influence of SCSD on the abundance and diversity of cbbL-carrying bacteria under long-term no-tillage with residue retention (NT) and conventional tillage without residue retention (CT) cultivation systems in maize. We found SCSD was smaller under NT than under CT in the 0–15 cm soil layer. The abundance and the Shannon diversity of cbbL-carrying bacteria in the NT treatment were lower than in the CT treatment. Soil carbon saturation and cbbL gene abundance showed a significant positive correlation, but there was no correlation between soil carbon saturation and cbbL gene diversity. However, the long-term NT practice decreased cbbL-carrying bacteria diversity and altered the community structure of the cbbL-carrying bacteria. Our results indicated that low SCSD limited the abundance of cbbL-carrying bacteria, but there was no relationship between low SCSD and diversity of cbbL-carrying bacteria. We suggest that further studies of cbbL-carrying bacteria carbon sequestration rates and capacity should be based on the effect of management practices on cbbL-carrying bacteria abundance and diversity. Our study has important implications for the relationship between the biological and physicochemical mechanisms in CO2 fixation.

YIN Tao;QIN Hong-ling;YAN Chang-rong;LIU Qi;HE Wen-qing

College of Resources and Environment,Qingdao Agricultural University,Qingdao 266109,P.R.China;Key Laboratory of Subtropical Agro-ecology,Institute of Subtropical Agriculture,Chinese Academy of Sciences,Changsha 410125,P.R.China;Institute of Environment and Sustainable Development in Agriculture,Chinese Academy of Agricultural Sciences,Beijing 100081,P.R.China;Key Laboratory of Prevention and Control of Residual Pollution in Agricultural Film,Ministry of Agriculture and Rural Affairs,Beijing 100081,P.R.China

农业科学学报（英文）

[1]YIN Tao;QIN Hong-ling;YAN Chang-rong;LIU Qi;HE Wen-qing-.Low soil carbon saturation deficit limits the abundance of cbbL-carrying bacteria under long-term no-tillage maize cultivation in northern China)[J].农业科学学报（英文）,2022(08):2399-2412

SCSD

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