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Effects of modified biochar on water and salt distribution and water-stable macro-aggregates in saline-alkaline soil

  • Soils, Sec 2 • Global Change, Environ Risk Assess, Sustainable Land Use • Research Article
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Abstract

Purpose

This study investigated the chemical and physical mechanisms associated with the movement of water and salt in saline-alkali soil amended with different types of biochar.

Materials and methods

Four types of biochar were selected: ordinary laboratory-prepared biochar (BC), acidified biochar (HBC), particle size modified biochar (NBC), and composite modified biochar (HNBC). The physical and chemical properties of the biochar treatments were characterized. Vertical infiltration simulation tests were conducted to analyze the effects of modification on the adsorption and distribution of salt ions on biochar, and the soil water-stable macro-aggregates in saline-alkali soil.

Results and discussion

The porous structure, specific surface area (SSA), micropore volume (VMIC), and H/C value were increased by acidification, particle size modification, and composite modification. Compared with BC, HBC and HNBC enhanced the O/C and (O+N)/C values, thereby increasing the hydrophilicity. The vertical infiltration tests showed that the depth of the soil wetting peak and cumulative infiltration were both higher than in the control (CK) after adding biochar, where HBC had the greatest water retention capacity. The modified biochar reduced the salt content and water-soluble Na+ content of the soil profile by increasing the soil water content and adsorbing Na+. The modified biochar promoted the formation and stabilization of soil water-stable macro-aggregates. Amending soil with HBC showed the greatest reduction in salt content and increased water-stable macro-aggregation.

Conclusions

HBC improved the water retention and Na+ adsorption capacity of biochar. This enhanced the formation of soil water-stable macro-aggregates and improved the effects of biochar on saline-alkali soil by altering soil physical and chemical properties.

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Acknowledgements

We thank Dr. Duncan E. Jackson for language editing.

Funding

This study was funded by the National Natural Science Foundation of China (41807131, 41977007, and 41830754), China Postdoctoral Science Foundation (2019M653707), Natural Science Foundation of Shaanxi Province of China (2019JQ-537 and 2017JM5107), and Research Project of State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China (2019KJCXTD-4 and QJNY-2019-01).

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Authors and Affiliations

  1. State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China, Xi’an University of Technology, Xi’an, 710048, China

    Manli Duan, Guohuan Liu, Beibei Zhou, Xiaopeng Chen, Quanjiu Wang, Hongyan Zhu & Zhijian Li

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  1. Manli Duan
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  2. Guohuan Liu
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  3. Beibei Zhou
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Correspondence to Beibei Zhou.

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Duan, M., Liu, G., Zhou, B. et al. Effects of modified biochar on water and salt distribution and water-stable macro-aggregates in saline-alkaline soil. J Soils Sediments 21, 2192–2202 (2021). https://doi.org/10.1007/s11368-021-02913-2

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