Journal of Microbiology and Biotechnology

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Effects of Short-Term Soil Tillage Management on Activity and Community Structure of Denitrifiers under Double-Cropping Rice Field

  • Tang, Haiming (Hunan Soil and Fertilizer Institute) ;
  • Li, Chao (Hunan Soil and Fertilizer Institute) ;
  • Cheng, Kaikai (Hunan Soil and Fertilizer Institute) ;
  • Shi, Lihong (Hunan Soil and Fertilizer Institute) ;
  • Wen, Li (Hunan Soil and Fertilizer Institute) ;
  • Xiao, Xiaoping (Hunan Soil and Fertilizer Institute) ;
  • Xu, Yilan (Hunan Biological and Electromechanical Polytechnic) ;
  • Li, Weiyan (Hunan Soil and Fertilizer Institute) ;
  • Wang, Ke (Hunan Soil and Fertilizer Institute)
  • Received : 2020.07.10
  • Accepted : 2020.09.21
  • Published : 2020.11.28
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Abstract

Soil physical and chemical characteristics, soil potential denitrification rates (PDR), community composition and nirK-, nirS- and nosZ-encoding denitrifiers were studied by using MiSeq sequencing, quantitative polymerase chain reaction (qPCR), and terminal restriction fragment polymorphism (T-RFLP) technologies base on short-term (5-year) tillage field experiment. The experiment included four tillage treatments: conventional tillage with crop residue incorporation (CT), rotary tillage with crop residue incorporation (RT), no-tillage with crop residue retention (NT), and rotary tillage with crop residue removed as control (RTO). The results indicated that soil organic carbon, total nitrogen and NH4+-N contents were increased with CT, RT and NT treatments. Compared with RTO treatment, the copies number of nirK, nirS and nosZ in paddy soil with CT, RT and NT treatments were significantly increased. The principal coordinate analysis indicated that tillage management and crop residue returning management were the most and the second important factors for the change of denitrifying bacteria community, respectively. Meanwhile, this study indicated that activity and community composition of denitrifiers with CT, RT and NT treatments were increased, compared with RTO treatment. This result showed that nirK, nirS and nosZ-type denitrifiers communities in crop residue applied soil had higher species diversity compared with crop residue removed soil, and denitrifying bacteria community composition were dominated by Gammaproteobacteria, Deltaproteobacteria, and Betaproteobacteria. Therefore, it is a beneficial practice to increase soil PDR level, abundance and community composition of nitrogen-functional soil microorganism by combined application of tillage with crop residue management.

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References

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