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Assessment of depth-dependent microbial carbon use efficiency in long-term fertilized paddy soil using an 18O-H2O approach
  • +6
  • Mostafa Zhran,
  • Tida Ge,
  • Yaoyao Tong,
  • Yangwu Deng,
  • Xiaomeng Wei,
  • Lynn Tin Mar,
  • Zhenke Zhu,
  • Jinshui Wu,
  • Anna Gunina
Mostafa Zhran
Egyptian Atomic Energy Authority

Corresponding Author:[email protected]

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Tida Ge
Institude of Subtropical Agriculture, The Chinese Academy of Sciences
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Yaoyao Tong
JiangXi University of Science and Technology
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Yangwu Deng
JiangXi University of Science and Technology
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Xiaomeng Wei
Institute of Subtropical Agriculture Chinese Academy of Sciences
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Lynn Tin Mar
Institute of Subtropical Agriculture Chinese Academy of Sciences
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Zhenke Zhu
Institude of Subtropical Agriculture, The Chinese Academy of Sciences
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Jinshui Wu
Chinese Acad Sci
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Anna Gunina
Universitat Kassel
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Abstract

Microbial biomass (MB) production and turnover strongly affect soil organic carbon (SOC) accumulation. Microbial carbon use efficiency (CUE) and MB turnover in paddy soil were determined using a novel substrate-independent H218O labeling approach and the effect of long-term fertilization with mineral (NPK) or combined (NPK+OM (manure)) amendments in 0-10, 10-20, and 20-30 cm depths were investigated. Long-term fertilization increased microbial C uptake, CUE, and growth rates, and all indexes were the highest in the NPK+OM treatment. The CUE ranged between 0.07 and 0.23 and showed variable behavior with depth: it reduced in the control treatment, indicating that more C was allocated to energy production than biomass growth, and increased in fertilized soils, showing the shift of C usage for biomass growth. The highest CUE was observed at 20-30 cm in NPK and NPK+OM and indicated that microorganisms overcome the nutrient deficiency in deep soil layers by keeping high C uptake rates at a constant CUE. MBC turnover was more rapid in NPK (10-70 d) and NPK+OM (40-65 d) compared to control (80 d) and intensified with the depth. These findings highlight that under long-term fertilization MB turnover can be controlled by CUE. These shifts in the strategies of microorganisms functioning can explain the accumulation of SOC in heavily fertilized paddy soils.
10 Feb 2020Submitted to Land Degradation & Development
11 Feb 2020Submission Checks Completed
11 Feb 2020Assigned to Editor
13 Feb 2020Reviewer(s) Assigned
02 Mar 2020Review(s) Completed, Editorial Evaluation Pending
13 Apr 2020Editorial Decision: Revise Major
11 May 20201st Revision Received
12 May 2020Submission Checks Completed
12 May 2020Assigned to Editor
05 Jun 2020Review(s) Completed, Editorial Evaluation Pending
06 Jun 2020Editorial Decision: Revise Minor
13 Jun 20202nd Revision Received
15 Jun 2020Submission Checks Completed
15 Jun 2020Assigned to Editor
15 Jun 2020Review(s) Completed, Editorial Evaluation Pending
20 Jun 2020Editorial Decision: Revise Minor
22 Jun 20203rd Revision Received
22 Jun 2020Submission Checks Completed
22 Jun 2020Assigned to Editor
22 Jun 2020Review(s) Completed, Editorial Evaluation Pending
26 Jun 2020Editorial Decision: Accept