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Aims <p>Wildfires produce large amounts of smoke and carbon emissions. The carbon-containing gases in the smoke combine with atmospheric water vapor and droplets to form wet deposition of smoke, which then settles into forest ecosystems. However, the impact of smoke-derived carbon on plant carbon absorption and allocation is still unclear. Understanding this phenomenon is of great significance for revealing the impact of forest fires on carbon input in forest ecosystems.</p> Methods <p>This study utilized <sup>13</sup>C pulse-labeling technology to deposit <sup>13</sup>C-containing smoke around the plant rhizosphere, investigated the absorption and allocation of smoke-derived carbon by <i>Cunninghamia lanceolata</i> seedlings under different concentrations of smoke deposition treatments.</p> Results <p>The results showed that low smoke concentration deposition significantly (<i>P</i> &lt; 0.001) promoted biomass production. The aeroponic-system was more conducive to underground growth, while the soil-culture system was more conducive to aboveground growth. Similarly, low smoke concentration deposition significantly (<i>P</i> &lt; 0.001) increased the total carbon content. The wildfire-derived <sup>13</sup>C content of various plant organs were higher for low than high smoke concentration treatment. Both the total carbon and wildfire-derived carbon contents of rhizosphere and non-rhizosphere soils were nearly equal. This indicates that plant roots directly absorb and allocate carbon from wildfires and transport it to the aboveground parts for internal cycling.</p> Conclusions <p>Plant growth and absorption of smoke derived carbon exhibited a concentration-dependent response to wildfire smoke deposition, with rhizosphere soils playing a minor role in carbon sequestration under wet smoke deposition. In summary, studying the absorption and allocation of smoke-derived carbon by plant roots is of great significance for understanding the function of forest ecosystems. In this context, our results provide valuable insights into the relationship between carbon cycling in forest ecosystems and wildfires.</p> Graphical abstract <p></p>

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Plants can directly absorb carbon derived from deposition of wildfire smoke

  • 期刊论文

  • 发表日期：

    2025年3月29日

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  • Xiaoyu Zhan,
  • Ziyan Huang,
  • Mulualem Tigabu,
  • Pingxin Zhao,
  • Yan He,
  • Futao Guo

摘要

Aims

Wildfires produce large amounts of smoke and carbon emissions. The carbon-containing gases in the smoke combine with atmospheric water vapor and droplets to form wet deposition of smoke, which then settles into forest ecosystems. However, the impact of smoke-derived carbon on plant carbon absorption and allocation is still unclear. Understanding this phenomenon is of great significance for revealing the impact of forest fires on carbon input in forest ecosystems.

Methods

This study utilized 13C pulse-labeling technology to deposit 13C-containing smoke around the plant rhizosphere, investigated the absorption and allocation of smoke-derived carbon by Cunninghamia lanceolata seedlings under different concentrations of smoke deposition treatments.

Results

The results showed that low smoke concentration deposition significantly (P < 0.001) promoted biomass production. The aeroponic-system was more conducive to underground growth, while the soil-culture system was more conducive to aboveground growth. Similarly, low smoke concentration deposition significantly (P < 0.001) increased the total carbon content. The wildfire-derived 13C content of various plant organs were higher for low than high smoke concentration treatment. Both the total carbon and wildfire-derived carbon contents of rhizosphere and non-rhizosphere soils were nearly equal. This indicates that plant roots directly absorb and allocate carbon from wildfires and transport it to the aboveground parts for internal cycling.

Conclusions

Plant growth and absorption of smoke derived carbon exhibited a concentration-dependent response to wildfire smoke deposition, with rhizosphere soils playing a minor role in carbon sequestration under wet smoke deposition. In summary, studying the absorption and allocation of smoke-derived carbon by plant roots is of great significance for understanding the function of forest ecosystems. In this context, our results provide valuable insights into the relationship between carbon cycling in forest ecosystems and wildfires.

Graphical abstract