Biochar induced negative priming effect on soil organic carbon mineralisation by changing the microbial community struct
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SOILS, SEC 2 • GLOBAL CHANGE, ENVIRON RISK ASSESS, SUSTAINABLE LAND USE • RESEARCH ARTICLE
Biochar induced negative priming effect on soil organic carbon mineralisation by changing the microbial community structure across plant growth stages Haotian Wang 1,2 & Wei Zhang 3 & Lijun Chen 1,2 & Qinsong Xu 3 & Yuji Jiang 1
&
Bo Sun 1
Received: 23 December 2019 / Accepted: 5 May 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Purpose Biochars have considerable potential to improve soil organic carbon (SOC) sequestration and consequently regulate greenhouse gas emissions. However, the important roles of microbial mediation in the biochar-induced SOC accumulation over the plant growth season have not been adequately explored. Here, we illustrated the interactive effects of biochar amendments and plant growth stages on the microbial community and SOC mineralisation. Materials and methods A 3-year experiment was performed in a tobacco (Nicotiana tabacum L.) field with five treatments, including no fertilisation, conventional fertilisation, and conventional fertilisation with three rates of biochar amendments. Results and discussion Biochar amendments significantly improved soil moisture capacity (SMC) but decreased nitrogen (N) availability. The bacterial and fungal biomasses were enriched under biochar amendments and at the rosette and vigorous stages of the crop growing season. Biochar amendments and plant growth stages substantially affected the microbial community structure, as determined by the ratios of bacteria to fungi (B/F) and Gram-positive bacteria to Gram-negative bacteria (GP/ GN). Random forest modelling revealed that SMC and N availability were the important predictors of microbial community and SOC mineralisation. Structural equation modelling indicated that microbial biomass and community structure (the rations of B/F and GP/GN) were positively associated with SMC but negatively correlated with N availability. Microbial community structure was more influential than microbial biomass in reducing microbial carbon metabolism of carbohydrates (cellobiose, glucose, and xylose) and SOC mineralisation. Conclusions Our study provided insights into the functional role of the microbial community in the biochar-induced negative priming effect on SOC mineralisation during the plant growth stages. Keywords Biochars . Carbon metabolism . Growth stages . Microbial biomass and community structure . Nitrogen availability . Soil moisture capacity Responsible editor: Weijin Wang Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11368-020-02662-8) contains supplementary material, which is available to authorized users. * Yuji Jiang [email protected] * Bo Sun [email protected] 1
State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
2
University of Chinese Academy of Sciences, Beijing 100049, China
3
College of Life Science, Nanjing Normal University, Nanjing 210023,
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