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Nitrogen addition mediates the effect of soil microbial diversity on microbial carbon use efficiency under long-term tillage practices
  • +7
  • Mengni Zhang,
  • Shengping Li,
  • Xueping Wu,
  • Fengjun Zheng,
  • Xiaojun Song,
  • Jinjing Lu,
  • Xiaotong Liu,
  • Bisheng Wang,
  • Ahmed Abdelrhman,
  • Aurore Degree
Mengni Zhang
Chinese Academy of Agricultural Sciences Institute of Agricultural Resources and Regional Planning

Corresponding Author:[email protected]

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Shengping Li
Chinese Academy of Agricultural Sciences Institute of Agricultural Resources and Regional Planning
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Xueping Wu
Chinese Academy of Agricultural Sciences Institute of Agricultural Resources and Regional Planning
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Fengjun Zheng
Chinese Academy of Agricultural Sciences Institute of Agricultural Resources and Regional Planning
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Xiaojun Song
Chinese Academy of Agricultural Sciences Institute of Agricultural Resources and Regional Planning
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Jinjing Lu
Chinese Academy of Agricultural Sciences Institute of Agricultural Resources and Regional Planning
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Xiaotong Liu
Chinese Academy of Agricultural Sciences Institute of Agricultural Resources and Regional Planning
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Bisheng Wang
Qingdao Agricultural University
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Ahmed Abdelrhman
Chinese Academy of Agricultural Sciences Institute of Agricultural Resources and Regional Planning
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Aurore Degree
University of Liege Faculty of Gembloux Agro-Bio Tech
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Abstract

Tillage practices can influence soil microbial carbon use efficiency (CUE), which is critical for carbon cycling in terrestrial ecosystems. The effect of tillage practices could also be regulated by nitrogen (N) addition. However, the soil microbial mechanism about N fertilizer effect on microbial CUE under no-tillage is still unclear. We investigated how N fertilizer regulates the effect of tillage management on microbial CUE through changing microbial properties and further assessed the impact of microbial CUE on particulate (POC) and mineral-associated organic matter carbon (MAOC) using a 16-yr field experiment with no-tillage (NT) and conventional tillage (CT), both of which combined with 105 (N1), 180 (N2), and 210 kg N ha-1 (N3) N application. We found that microbial CUE increased with increasing N application rate. NT increased microbial CUE compared with CT under N1. The bacterial and fungal diversities of NT was higher than CT and N application decreased their diversities in the 0-10 cm layer. The partial least squares path model showed that bacteria diversity, fungal diversity, and fungal community structure played more critical roles in increasing microbial CUE. Furthermore, POC and MAOC under NT were higher than CT and they also increased with increasing N application rate. This could be explained by the finding that increasing microbial CUE induced by N application had the potential to increase POC and MAOC. Overall, N addition is an important pathway to influence microbial CUE, which is mainly regulated by bacterial and fungal diversities rather than their biomass under no-tillage.
11 Oct 2021Submitted to Land Degradation & Development
12 Oct 2021Submission Checks Completed
12 Oct 2021Assigned to Editor
13 Oct 2021Review(s) Completed, Editorial Evaluation Pending
15 Oct 20211st Revision Received
18 Oct 2021Submission Checks Completed
18 Oct 2021Assigned to Editor
18 Jan 2022Review(s) Completed, Editorial Evaluation Pending
22 Jan 2022Editorial Decision: Revise Major
17 Feb 20222nd Revision Received
18 Feb 2022Submission Checks Completed
18 Feb 2022Assigned to Editor
05 Mar 2022Review(s) Completed, Editorial Evaluation Pending
05 Mar 2022Editorial Decision: Revise Minor
21 Mar 20223rd Revision Received
22 Mar 2022Submission Checks Completed
22 Mar 2022Assigned to Editor
02 Apr 2022Review(s) Completed, Editorial Evaluation Pending
02 Apr 2022Editorial Decision: Accept
15 Aug 2022Published in Land Degradation & Development volume 33 issue 13 on pages 2258-2275. 10.1002/ldr.4279