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Linking Methane Emissions to Iron Dynamics in Bioturbated Rice Systems

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作者

    Qianrui Huangfu，  Sha Zhang， 
    Sha Zhang
    • Institute of Urban Environment, Chinese Academy of Sciences
    Zheng Chen， 
    Zheng Chen
    Lu Wang， 
    Lu Wang
    Dong Zhu
    Dong Zhu
分类
生态学与环境生物学
关键词
Bioturbation; methane; microdialysis; oxic-anoxic interface; dissolved iron; ratoon (semi-perennial) rice; temperature sensitivity

摘要

Iron (Fe) redox cycling is intricately linked to methane (CH₄) emissions in global wetlands, yet its role under sustained bioturbation remains poorly quantified. We investigated how continuous loach (Misgurnus anguillicaudatus) activity influences CH₄ emissions and Fe dynamics in a ratoon rice system over 178 days. Methane and ecosystem CO₂ fluxes were measured continuously, while in situ microdialysis quantified dissolved Fe in surface and root-zone porewaters. The results showed that loach bioturbation increased cumulative CH₄ emissions by 31.9% (95% CI: [18.2%, 40.2%], p = 0.0033) and sustained elevated dissolved Fe concentrations near the soil–water interface (SWI), indicating intensified reducing conditions and a weakened SWI barrier for CH₄. A Fe-based process model alone explained >78% of CH₄ flux variability. A more integrated model further suggested that loach activity enhanced CH₄ emissions by increasing labile carbon supply, CH₄ production efficiency, and CH₄ transport. These findings position dissolved Fe as a practical proxy for CH₄ emissions, with implications on improving global CH₄ models.

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2026-02-03

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Huangfu, Q., Zhang, S., Chen, Z., Wang, L., & Zhu, D. (2026). Linking Methane Emissions to Iron Dynamics in Bioturbated Rice Systems. 浪淘沙预印本平台. https://doi.org/10.65215/LTSpreprints.2026.02.03.000121

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