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Biochar addition enhances annual carbon stocks and ecosystem carbon sink intensity in saline soils of the Hetao Irrigation District, Inner Mongolia

Author

Listed:
  • Ruxin Zhang

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

  • Zhongyi Qu

    (College of Energy and Environment, Inner Mongolia University of Science and Technology, Baotou, P.R. 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, P.R. China)

  • Wei Yang

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

  • Liping Wang

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

  • Dongliang Zhang

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

  • Lu Liu

    (Northern Construction Management Department, China Three Gorges Renewables (Group) Co., Ltd., Beijing, P.R. China)

  • Junjie Li

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

  • Zhimin Zhang

    (Inner Mongolia Hetao Irrigation District Water Development Center Yichang Branch Center Yihe Canal Water Supply Station, Bayan Nur, P.R. China)

Abstract

Biochar has demonstrated potential for stabilising high yields and sequestering carbon in dryland farmland, but it is unclear whether biochar affects the carbon sequestration capacity and carbon balance of annual farmland ecosystems. For this purpose, we conducted a plot control trial in salinised farmland in 2019-2021, where we set three treatments, control, and two biochar rates, 0 (CK), 15 (B15), and 30 t/ha (B30). The results showed that biochar application decreased soil organic carbon stocks in the early part of the experiment (first freeze and freeze period); these increased in the later part, and overall, the biochar treatments increased soil organic carbon storage by 3-6% compared with the control. Compared with the control (CK), biochar inhibited the total soil respiration rate and microbial respiration rate significantly (P < 0.05) during the crop growing period compared with the freeze-thaw period. After two years of freeze-thaw cycling, biochar application increased sunflower plant carbon sequestration and net primary productivity and suppressed total soil microbial respiration, thereby increasing net ecosystem productivity. Therefore, the application of biochar is conducive to carbon sequestration in farmland ecosystems and presents a carbon sink effect, thus being a good choice for improving the soil carbon pool and reducing emissions in the northern dry zone.

Suggested Citation

  • Ruxin Zhang & Zhongyi Qu & Wei Yang & Liping Wang & Dongliang Zhang & Lu Liu & Junjie Li & Zhimin Zhang, 2024. "Biochar addition enhances annual carbon stocks and ecosystem carbon sink intensity in saline soils of the Hetao Irrigation District, Inner Mongolia," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 70(5), pages 263-275.
    • Handle: RePEc:caa:jnlpse:v:70:y:2024:i:5:id:121-2023-pse
    DOI: 10.17221/121/2023-PSE
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    References listed on IDEAS

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    1. Matovic, Darko, 2011. "Biochar as a viable carbon sequestration option: Global and Canadian perspective," Energy, Elsevier, vol. 36(4), pages 2011-2016.
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