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<p>Wetlands play a critical role in mitigating global climate change. However, rapid urbanization and economic development have exacerbated wetland degradation, threatening their carbon sequestration capacity. To address this, we established a simulated wetland system in the laboratory to investigate the effects of planting <i>Vallisneria natans</i>, <i>Myriophyllum spicatum</i>, <i>Hydrilla verticillata</i>, and <i>Elodea nuttallii</i> at varying densities on the storage and stability of rhizospheric soil organic carbon (SOC). Based on soil content measurements, particle size distribution (2 micrometer, 2–53 micrometer, 53–250 micrometer, and 250–2000 micrometer) and chemical composition of rhizospheric SOC, it was found that VN outperformed the other three species. Specifically, the VN group exhibited the highest rhizospheric SOC content (2.37&#xa0;kg/m<sup>2</sup>), the most pronounced increase in aromatic C (from 19.53 to 27.94%), and the greatest modification of soil structure, with fine sand (53–250 micrometer) and coarse sand (250–2000 micrometer) fractions increasing by 20.97% and 5.32%, respectively, compared to the control. Furthermore, intermediate planting densities (50% and 75%) of VN were most effective in improving the content and stability of SOC. The coupled application of VN with 1.5% biochar further enhanced these effects, increasing SOC content from 0.64&#xa0;kg/m<sup>2</sup> to 2.46&#xa0;kg/m<sup>2</sup> and the MBC/TC ratio from 2.31 to 4.13%. Additionally, the proportions of fine sand and coarse sand significantly increased from 6.21% and 0.00–9.92% and 1.05%, respectively (<i>p</i> &lt; 0.05), further improving the content and stability of rhizospheric SOC. In conclusion, the integration of biochar with submerged plants, particularly VN, can significantly enhance carbon sequestration in wetlands and presents a promising strategy for future wetland restoration efforts.</p>

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The Impact of Biochar Combined with Submerged Plants on the Storage and Stability of Rhizospheric Soil Organic Carbon in Wetlands

  • 期刊论文

  • 发表日期：

    2025年7月18日

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  • Yang Yu,
  • Sheng-Nan Du,
  • Bang-Ping Deng,
  • Ling-Kan Su,
  • Juan-Ying Li

摘要

Wetlands play a critical role in mitigating global climate change. However, rapid urbanization and economic development have exacerbated wetland degradation, threatening their carbon sequestration capacity. To address this, we established a simulated wetland system in the laboratory to investigate the effects of planting Vallisneria natans, Myriophyllum spicatum, Hydrilla verticillata, and Elodea nuttallii at varying densities on the storage and stability of rhizospheric soil organic carbon (SOC). Based on soil content measurements, particle size distribution (2 micrometer, 2–53 micrometer, 53–250 micrometer, and 250–2000 micrometer) and chemical composition of rhizospheric SOC, it was found that VN outperformed the other three species. Specifically, the VN group exhibited the highest rhizospheric SOC content (2.37 kg/m2), the most pronounced increase in aromatic C (from 19.53 to 27.94%), and the greatest modification of soil structure, with fine sand (53–250 micrometer) and coarse sand (250–2000 micrometer) fractions increasing by 20.97% and 5.32%, respectively, compared to the control. Furthermore, intermediate planting densities (50% and 75%) of VN were most effective in improving the content and stability of SOC. The coupled application of VN with 1.5% biochar further enhanced these effects, increasing SOC content from 0.64 kg/m2 to 2.46 kg/m2 and the MBC/TC ratio from 2.31 to 4.13%. Additionally, the proportions of fine sand and coarse sand significantly increased from 6.21% and 0.00–9.92% and 1.05%, respectively (p < 0.05), further improving the content and stability of rhizospheric SOC. In conclusion, the integration of biochar with submerged plants, particularly VN, can significantly enhance carbon sequestration in wetlands and presents a promising strategy for future wetland restoration efforts.