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  • Soils, Sec 3 • Remediation and Management of Contaminated or Degraded Lands • Research Article
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Contrasting effects of aged and fresh biochars on glucose-induced priming and microbial activities in paddy soil

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  • 23 Citations

Abstract

Purpose

The understanding of soil organic matter (SOM) decomposition to biochar (BC) addition in paddy soil remains limited. This study was to examine the glucose-induced priming effects of paddy soil as affected by aged and/or fresh BCs.

Materials and methods

Soil samples were collected from the paddy fields without and with BC applied 1 year before the laboratory incubation. The control without BC, the soil with BC applied in the field (aged BC), aged BC and the additional fresh BC applied (A/F-BC), and the soil with fresh BC (fresh BC), each with glucose (14C) addition or not were incubated under either moist or flooding conditions. Totally, 16 treatments were established.

Results and discussion

The aged-BC group treatments had greater carbon dioxide (CO2) efflux (averagely 26 %) compared to the control group, while CO2 efflux was reduced following fresh BC addition by 23 and 21 % in the A/F-BC and fresh-BC groups, respectively. In the presence of aged BC, microbial biomass and the potential activities of ß-glucosidase, xylanase, cellobiohydrolase, and chitinase were increased under both moist and flooding conditions, but they were decreased in the fresh-BC group under flooding conditions. For the control group, positive priming of 58 and 102 μg C g−1 were observed after glucose addition under moist and flooding conditions, respectively. Positive priming was also observed in the fresh-BC group amounting to 34 and 19 μg C g−1 under moist and flooding conditions, respectively. However, negative priming was found in the soil samples with aged BC, especially under moist conditions, which was possibly due to the preferential use of glucose over the more recalcitrant organic C in both SOM and BC and SOC stabilization via either organic matter sorption on BC or the BC-induced organic-mineral interaction.

Conclusions

BC effects on CO2 efflux and microbial activities depend strongly on its age. Aged BC improves soil microbial parameters and also contributes to C sequestration in soil by negative priming. In contrast, fresh BC addition depresses microbial activities but stimulates the mineralization of SOM and itself following glucose addition.

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Acknowledgments

This work was jointly supported by the National Science Foundation of China (41171238, 41471192), Special Fund for Agro-Scientific Research in the Public Interest (201503106), the Ministry of Science and Technology (2013BAD11B01), and the Graduate Research and Innovation Projects for College Graduates of Jiangsu Province (CXZZ13_0298). The first author also thanks China Scholarship Council for providing funds to him to pursue his study in Germany.

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Correspondence to Zhengqin Xiong.

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Responsible editor: Yong Sik Ok

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Wang, J., Dokohely, M.E., Xiong, Z. et al. Contrasting effects of aged and fresh biochars on glucose-induced priming and microbial activities in paddy soil. J Soils Sediments 16, 191–203 (2016). https://doi.org/10.1007/s11368-015-1189-0

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Keywords

  • Carbon cycle
  • Climate change
  • Extracellular enzyme activity
  • Microbial dynamics
  • Pyrogenic organic matter
  • Rice field