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<p>Global forest fires frequently occur and have significant impacts on ecosystems carbon fluxes. Biomass combustion produces a large amount of smoke and carbon emissions, which combine with atmospheric water vapor and droplets to create wet deposition of smoke into the ecosystem. The carbon cycle process between roots and soil serves as a vital link between plants and soil. However, it remains largely unexplored how the smoke deposition from forest fires affects the carbon reaction processes between roots and soil. Thus, this study simulated different concentrations of smoke deposition by applying wildfire smoke to the plant rhizosphere to investigate how plant roots and rhizosphere soil respond to “exogenous” smoke deposition under varying smoke concentration treatments. Our results indicate that smoke deposition reduced the abundance of functional genes related to microbial carbon fixation pathways in the rhizosphere soil while increasing the abundance of genes related to carbon degradation pathways. High-concentration smoke deposition led to a downregulation of root carbon reaction genes and root exudate over time. Structural equation modeling (SEM) further revealed that smoke deposition indirectly regulated root carbon reaction processes by influencing the carbon reaction process in the rhizosphere soil. Overall, our study provides useful insights and scientific evidence for understanding the impact of forest fire on the carbon cycle in forest ecosystems.</p>

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Rhizosphere carbon reaction in response to wildfire smoke deposition

  • 期刊论文

  • 发表日期：

    2025年7月8日

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  • Xiaoyu Zhan,
  • Ziyan Huang,
  • Mulualem Tigabu,
  • Jiayu Chen,
  • Zhehan Li,
  • Guangyu Wang,
  • Futao Guo

摘要

Global forest fires frequently occur and have significant impacts on ecosystems carbon fluxes. Biomass combustion produces a large amount of smoke and carbon emissions, which combine with atmospheric water vapor and droplets to create wet deposition of smoke into the ecosystem. The carbon cycle process between roots and soil serves as a vital link between plants and soil. However, it remains largely unexplored how the smoke deposition from forest fires affects the carbon reaction processes between roots and soil. Thus, this study simulated different concentrations of smoke deposition by applying wildfire smoke to the plant rhizosphere to investigate how plant roots and rhizosphere soil respond to “exogenous” smoke deposition under varying smoke concentration treatments. Our results indicate that smoke deposition reduced the abundance of functional genes related to microbial carbon fixation pathways in the rhizosphere soil while increasing the abundance of genes related to carbon degradation pathways. High-concentration smoke deposition led to a downregulation of root carbon reaction genes and root exudate over time. Structural equation modeling (SEM) further revealed that smoke deposition indirectly regulated root carbon reaction processes by influencing the carbon reaction process in the rhizosphere soil. Overall, our study provides useful insights and scientific evidence for understanding the impact of forest fire on the carbon cycle in forest ecosystems.