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Background and aims <p>Although invasive&#xa0;<i>Spartina alterniflora</i> (<i>S. alterniflora</i>)&#xa0;alters coastal wetland carbon cycling, the role of soil iron cycling in the plant root-microbe interaction process remains unclear. This study aims to elucidate how invasive <i>S. alterniflora</i> enhance soil organic carbon (SOC) stability (compared with native species) by altering soil iron cycling and mediating its coupling with Fe-bound organic carbon (Fe-OC).</p> Methods <p>In this study, Fe valence states, Fe oxides, SOC pools, active carbon pools and Fe-OC pools were compared in rhizosphere and bulk soils of&#xa0;<i>S. alterniflora</i>,&#xa0;<i>Phragmites australis</i>(<i>P. australis</i>), and&#xa0;<i>Spartina mariqueter</i>(<i>S. mariqueter</i>) across high and low tidal flats. Iron-oxidizing bacteria (IOB) and iron-reducing bacteria (IRB) communities were also analyzed.</p> Results <p>On the low tidal flat, Fe(II) content in soils under&#xa0;<i>S. alterniflora</i> (3.47 ± 0.72&#xa0;g/kg) was significantly higher than in&#xa0;soils under <i>S. mariqueter</i>&#xa0;(1.08 ± 0.24&#xa0;g/kg). On the high tidal flat,&#xa0;<i>S. alterniflora</i>&#xa0;roots strongly accumulated Fe, with rhizosphere total Fe content (5.72 ± 0.19&#xa0;g/kg) significantly exceeding that in bulk soil (3.59 ± 1.33&#xa0;g/kg), thereby elevating Fe complexation and Fe-OC concentrations (4.44 ± 0.51&#xa0;g/kg) and enhancing SOC sequestration.&#xa0;<i>S. alterniflora</i>&#xa0;invasion increased the abundance of IRB at low tidal flats and IOB at high tidal flats. Across all rhizosphere soils, the dominant IRB genera were&#xa0;<i>Geobacter</i>,&#xa0;<i>Desulfuromonas</i>, and&#xa0;<i>Shewanella</i>, while&#xa0;<i>Gallionella</i>,&#xa0;<i>Sideroxydans</i>, and&#xa0;<i>Pseudomonas</i>&#xa0;dominated the IOB community.</p> Conclusion <p><i>S. alterniflora</i>&#xa0;roots drive Fe-OC accumulation (especially in high tidal rhizospheres) and reshape IOB and IRB communities, thereby enhancing SOC stability in coastal wetlands.</p>

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Impact of Spartina alterniflora root systems on Fe-bound organic carbon and bacterial communities of soil in Jiuduansha wetland

  • 期刊论文

  • 发表日期：

    2026年3月18日

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  • Sihan Liu,
  • Wei Liu,
  • Chiquan He,
  • Jing Hua,
  • Yanxiang Tao,
  • Daoyuan Wang,
  • Zhenzhen Zhao,
  • Xueping Chen,
  • Feifei Wang,
  • Xiaoyan Liu

摘要

Background and aims

Although invasive Spartina alterniflora (S. alterniflora) alters coastal wetland carbon cycling, the role of soil iron cycling in the plant root-microbe interaction process remains unclear. This study aims to elucidate how invasive S. alterniflora enhance soil organic carbon (SOC) stability (compared with native species) by altering soil iron cycling and mediating its coupling with Fe-bound organic carbon (Fe-OC).

Methods

In this study, Fe valence states, Fe oxides, SOC pools, active carbon pools and Fe-OC pools were compared in rhizosphere and bulk soils of S. alterniflora, Phragmites australis(P. australis), and Spartina mariqueter(S. mariqueter) across high and low tidal flats. Iron-oxidizing bacteria (IOB) and iron-reducing bacteria (IRB) communities were also analyzed.

Results

On the low tidal flat, Fe(II) content in soils under S. alterniflora (3.47 ± 0.72 g/kg) was significantly higher than in soils under S. mariqueter (1.08 ± 0.24 g/kg). On the high tidal flat, S. alterniflora roots strongly accumulated Fe, with rhizosphere total Fe content (5.72 ± 0.19 g/kg) significantly exceeding that in bulk soil (3.59 ± 1.33 g/kg), thereby elevating Fe complexation and Fe-OC concentrations (4.44 ± 0.51 g/kg) and enhancing SOC sequestration. S. alterniflora invasion increased the abundance of IRB at low tidal flats and IOB at high tidal flats. Across all rhizosphere soils, the dominant IRB genera were Geobacter, Desulfuromonas, and Shewanella, while Gallionella, Sideroxydans, and Pseudomonas dominated the IOB community.

Conclusion

S. alterniflora roots drive Fe-OC accumulation (especially in high tidal rhizospheres) and reshape IOB and IRB communities, thereby enhancing SOC stability in coastal wetlands.