Journal of Integrative Agriculture ›› 2022, Vol. 21 ›› Issue (8): 2399-2412.DOI: 10.1016/S2095-3119(21)63800-5

所属专题: 农业生态环境-有机碳与农业废弃物还田合辑Agro-ecosystem & Environment—SOC

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中国北方玉米田长期免耕条件下低土壤碳饱和亏缺降低cbbL细菌丰度

  



  • 收稿日期:2021-05-13 接受日期:2021-07-08 出版日期:2022-08-01 发布日期:2021-07-08

Low soil carbon saturation deficit limits the abundance of cbbL-carrying bacteria under long-term no-tillage maize cultivation in northern China

YIN Tao1, QIN Hong-ling3, YAN Chang-rong2, 4, LIU Qi2, 4, HE Wen-qing2, 4   

  1. 1 College of Resources and Environment, Qingdao Agricultural University, Qingdao 266109, P.R.China

    2 Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, P.R.China

    3 Key Laboratory of Subtropical Agro-ecology, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, P.R.China

    4 Key Laboratory of Prevention and Control of Residual Pollution in Agricultural Film, Ministry of Agriculture and Rural Affairs, Beijing 100081, P.R.China

  • Received:2021-05-13 Accepted:2021-07-08 Online:2022-08-01 Published:2021-07-08
  • About author:YIN Tao, Mobile: +86-17611102054, E-mail: yintao@qau.edu.cn; Correspondence HE Wen-qing, E-mail: hewenqing@caas.cn
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (31171512 and 42007312), the Key R&D Program of Hainan Province, China (ZDYF2020084), the Natural Science Foundation of Shandong Province, China (ZR2020QD117), the Research Fund for Introduced High-level Talents of Qingdao Agricultural University, China (11201103) and the Central Public-interest Scientific Institution Basal Research Fund, China (BSRF202001).

摘要:

目前关于农田耕作管理措施下,cbbL细菌对不同水平土壤碳饱和亏缺(SCSD)的响应机制仍不清楚。因此我们研究了长期免耕秸秆还田(NT)和常规耕作(CT)措施下,SCSD对cbbL细菌丰度和多样性的影响。结果表明,相比于CT,NT降低了SCSD,降低了cbbL细菌的丰度和香农指数,改变了cbbL细菌的群落结构。另外,土壤碳饱和和cbbL基因数量存在显著正相关关系,但是与cbbL基因多样性之间不存在相关关系。综上,低SCSD限制了cbbL细菌的丰度,但是对cbbL细菌的多样性没有影响。因此,关于cbbL细菌固碳速率和能力的研究,应该建立在耕作措施对cbbL细菌丰度和多样性影响的基础上。我们的研究揭示了土壤固定CO2过程中生物机制和物理化学机制之间存在的关系,对于CO2的固定机制研究具有重要意义。


Abstract:

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.

Key words: conservation tillage ,  soil carbon saturation ,  cbbL-carrying bacteria ,  abundance and diversity