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Regulation of CH 4 and N 2 O Emissions by Biochar Application in a Salt-Affected Sorghum Farmland

Author

Listed:
  • Yibo Zhao

    (College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China)

  • Wei Yang

    (College of Grassland Science, Inner Mongolia Agricultural University, Hohhot 010011, China
    Autonomous Region Collaborative Innovation Center for Integrated Management of Water Resources and Water Environment in the Inner Mongolia Reaches of the Yellow River, Hohhot 010018, China
    State Key Laboratory of Water Engineering Ecology and Environment in Arid Area, Inner Mongolia Agricultural University, Hohhot 010018, China)

  • Zhongyi Qu

    (College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China
    Autonomous Region Collaborative Innovation Center for Integrated Management of Water Resources and Water Environment in the Inner Mongolia Reaches of the Yellow River, Hohhot 010018, China
    State Key Laboratory of Water Engineering Ecology and Environment in Arid Area, Inner Mongolia Agricultural University, Hohhot 010018, China
    College of Energy and Environment, Inner Mongolia University of Science and Technology, Baotou 014020, China)

  • Liping Wang

    (College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China
    Autonomous Region Collaborative Innovation Center for Integrated Management of Water Resources and Water Environment in the Inner Mongolia Reaches of the Yellow River, Hohhot 010018, China
    State Key Laboratory of Water Engineering Ecology and Environment in Arid Area, Inner Mongolia Agricultural University, Hohhot 010018, China)

  • Yixuan Yang

    (College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China)

  • Yusheng Hao

    (College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China)

Abstract

The ameliorative mechanism of biochar in reducing soil greenhouse gas emissions in arid saline farmland remains unclear. A two-year field study in sorghum farmland in China’s Hetao Irrigation District was conducted to assess the influence of corn straw-derived biochar on GHG emissions and explore the role of soil physicochemical properties in regulating GHG fluxes. Four different biochar application rates were tested: 0 (CK), 15 (C15), 30 (C30), and 45 t hm −2 (C45). Compared to CK, C15 reduced CH 4 emissions by 15.2% and seasonal CH 4 flux by 77.0%. The N 2 O flux followed CK > C45 > C30 > C15 from 2021 to 2022. C15 and C30 significantly decreased GWP, mitigating GHG emission intensity. Biochar application enhanced sorghum grain yield. Soil temperature was the primary determinant of CH 4 flux (total effect = 0.92). In the second year, biochar’s influence on CH 4 emissions increased by 0.76. Multivariate SEM identified soil moisture (total effect = −0.72) and soil temperature (total effect = −0.70) as primary negative regulators of N 2 O fluxes. C40 lead to salt accumulation, which increases CH 4 emissions but inhibits N 2 O emissions. Averaged over two years, GWP under C15 and C30 decreased by 76.5–106.7% and 5.3–56.1%, respectively, compared to CK. Overall, the application of biochar at a rate of 15 t hm −2 significantly reduced CH 4 and N 2 O emissions and increased sorghum yield.

Suggested Citation

  • Yibo Zhao & Wei Yang & Zhongyi Qu & Liping Wang & Yixuan Yang & Yusheng Hao, 2025. "Regulation of CH 4 and N 2 O Emissions by Biochar Application in a Salt-Affected Sorghum Farmland," Agriculture, MDPI, vol. 15(15), pages 1-20, July.
    • Handle: RePEc:gam:jagris:v:15:y:2025:i:15:p:1592-:d:1709113
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