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Background <p>The fast-growing <i>Sonneratia caseolaris</i> has been widely used in restoration efforts to accelerate the recovery of degraded mangrove ecosystems. Carbon-fixing bacteria (CFB) are recognized as major microbial contributors to sediment carbon accumulation in the mangrove wetlands. However, the response of the CFB community and sediment organic carbon (SOC) to introduced <i>S. caseolaris</i> is still unknown.</p> Results <p>In this study, the sediment properties (especially SOC), the abundances of carbon-fixing genes (<i>cbbL</i> and <i>cbbM</i>), as well as the CFB community composition based on <i>cbbL</i> and <i>cbbM</i> functional genes and their interaction network, were compared between the introduced mangrove species (<i>S. caseolaris</i>) and native species (<i>Kandelia obovata</i>, <i>Aegiceras corniculatum</i>, and <i>Acanthus ilicifolius</i>) in the Niutianyang Mangrove Forest, Shantou, China. Our results showed that <i>S. caseolaris</i> markedly enhanced the SOC content and the abundances of the carbon-fixing genes (<i>P</i> &lt; 0.05). The dominant CFB taxa were “purple sulfur bacteria” (PSB) (e.g., <i>Chromatiales</i>) and “purple nonsulfur bacteria” (PNSB) (e.g., <i>Rhodobacterales</i>). The relative abundances of some well-known plant growth-promoting rhizobacteria (PGPR), especially the <i>Rhizobiales</i> and <i>Burkholderiales</i>, were significantly increased (<i>P</i> &lt; 0.05) by the <i>S. caseolaris</i> introduction. In addition, there was a more complex but less stable CFB community interaction network in the <i>S. caseolaris</i> sediments. It was well worth noting that a large number of the keystone taxa in the network were the sulfur-oxidizing bacteria (SOB), such as <i>Sulfuriferula</i> and <i>Thioalkalivibrio</i>, suggesting a tight connection between the carbon and sulfur cycles in mangrove wetlands, and these key genera might have decisive roles in reshaping CFB community structure and functioning.</p> Conclusions <p>These findings confirmed that introduced <i>S. caseolaris</i> can strongly affect the CFB communities and the SOC content, and provided new insights into the microbial carbon sequestration in the mangrove wetlands.</p>

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Carbon-fixing bacteria and sediment organic carbon response to the introduction of mangrove plant Sonneratia caseolaris

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月26日

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  • Xiaofang Huang,
  • Junde Dong,
  • Youshao Wang,
  • Hongbin Liu,
  • Weiguo Zhou,
  • Hao Cheng,
  • Xi Yang,
  • Tongyin Liang,
  • Bing Yang,
  • Juan Ling

摘要

Background

The fast-growing Sonneratia caseolaris has been widely used in restoration efforts to accelerate the recovery of degraded mangrove ecosystems. Carbon-fixing bacteria (CFB) are recognized as major microbial contributors to sediment carbon accumulation in the mangrove wetlands. However, the response of the CFB community and sediment organic carbon (SOC) to introduced S. caseolaris is still unknown.

Results

In this study, the sediment properties (especially SOC), the abundances of carbon-fixing genes (cbbL and cbbM), as well as the CFB community composition based on cbbL and cbbM functional genes and their interaction network, were compared between the introduced mangrove species (S. caseolaris) and native species (Kandelia obovata, Aegiceras corniculatum, and Acanthus ilicifolius) in the Niutianyang Mangrove Forest, Shantou, China. Our results showed that S. caseolaris markedly enhanced the SOC content and the abundances of the carbon-fixing genes (P < 0.05). The dominant CFB taxa were “purple sulfur bacteria” (PSB) (e.g., Chromatiales) and “purple nonsulfur bacteria” (PNSB) (e.g., Rhodobacterales). The relative abundances of some well-known plant growth-promoting rhizobacteria (PGPR), especially the Rhizobiales and Burkholderiales, were significantly increased (P < 0.05) by the S. caseolaris introduction. In addition, there was a more complex but less stable CFB community interaction network in the S. caseolaris sediments. It was well worth noting that a large number of the keystone taxa in the network were the sulfur-oxidizing bacteria (SOB), such as Sulfuriferula and Thioalkalivibrio, suggesting a tight connection between the carbon and sulfur cycles in mangrove wetlands, and these key genera might have decisive roles in reshaping CFB community structure and functioning.

Conclusions

These findings confirmed that introduced S. caseolaris can strongly affect the CFB communities and the SOC content, and provided new insights into the microbial carbon sequestration in the mangrove wetlands.