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Effect of pristine and Fe-modified rice husk-derived biochar on denitrification and N2O emission in calcareous arable soil

  • Soils, Sec 5 • Soil and Landscape Ecology • Research Article
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Abstract

Purpose

The objective of the study was to explore the effect of pristine (rice husk-derived biochar produced at 500 ℃ by a Japanese company, JBC) and FeCl3-modified biochar (JBC-Fe) and its application rate on denitrification and N2O emission in calcareous arable soil and the potential mechanisms.

Methods

After biochar preparation and characterization, JBC or JBC-Fe was thoroughly mixed with the soil at the mass ratio of 2% or 5%, which were defined as JBC-2%, JBC-5%, JBC-Fe-2%, and JBC-Fe-5%, respectively, and a control treatment without any biochar addition was also arranged. After 7-day preincubation, an 8-day microcosm incubation experiment was carried out consecutively under the condition of facilitating denitrification. N2O and N2O + N2 emission rates were determined, and the distribution pattern of N2O and N2, as the end products of denitrification, was distinguished by the acetylene inhibition method. The dynamic changes of soil physicochemical properties and the activities of nitrate reductase and nitrite reductase during incubation were also explored.

Results

Results showed that both JBC and JBC-Fe promoted soil cumulative N2O + N2 and N2O emission during the 8-day incubation. Compared with JBC-2%/JBC-5%, the cumulative N2O + N2 emission of JBC-Fe-2%/JBC-Fe-5% significantly increased by 9.83%/41.21% and the cumulative N2O emission significantly increased by 465.98%/147.68%, respectively (p < 0.05), indicating that JBC-Fe promoted soil NO3 reduction and inhibited N2O reduction compared to JBC. Compared with 2% biochar addition, 5% biochar addition increased soil C/N ratio, decreased the bioavailability of nitrogen and inhibited soil nitrate reductase activity, and subsequently decreased the cumulative N2O + N2 emission. Moreover, 5% biochar addition also inhibited soil N2O reductase activity, resulting in the increase of cumulative N2O emission.

Conclusions

JBC-Fe did not show the greenhouse gas mitigation benefits, but increased N2O emission from the calcareous arable soil under the condition of facilitating denitrification (e.g., after heavy rainfall, irrigation, and fertilization). The study provides a theoretical basis to functional biochar production and its engineering application in calcareous arable soil.

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Data availability

The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.

References

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Funding

This research was funded by the National Natural Science Foundation of China (No. 41503074), the Natural Science Foundation of Shanxi Province (No. 201901D111066), and a school-enterprise cooperation project focusing on nitrate removal from reclaimed water.

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Authors and Affiliations

Authors

Contributions

All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by Chaoxu Wang, Zhilin Chang, Yongchao Liu and Yuankun Li. The first draft of the manuscript was written by Chaoxu Wang and Zhilin Chang. All authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Chaoxu Wang.

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Competing interests

The authors declare no competing interests.

Additional information

Responsible editor: Yuan Ge

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Highlights

• JBC-Fe increased N2O emission from the calcareous arable soil under denitrification conditions.

• JBC-Fe promoted soil NO3 reduction but inhibited N2O reduction during denitrification.

• 5% biochar addition rate led to soil nitrogen-deficiency and inhibited both NO3 and N2O reductase activities.

Supplementary Information

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Supplementary file1 (DOCX 17 KB)

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Wang, C., Chang, Z., Liu, Y. et al. Effect of pristine and Fe-modified rice husk-derived biochar on denitrification and N2O emission in calcareous arable soil. J Soils Sediments 23, 2529–2543 (2023). https://doi.org/10.1007/s11368-023-03506-x

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  • DOI: https://doi.org/10.1007/s11368-023-03506-x

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