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Purpose <p>Mangroves provide essential ecosystem functions such as carbon sequestration, biodiversity conservation, and nutrient cycling. Soil microbial communities play key roles in these processes, yet their distribution patterns in mangroves remain insufficiently understood across regions and vegetation types. Therefore, characterization and explanation of the performances in microbial structure and function with varied mangrove tree species and regions will be critical for a better understanding of the functions driven by mangrove microbiome.</p> Materials and methods <p>This study used 16&#xa0;S rRNA and ITS gene sequencing to investigate the composition, diversity, and function of soil bacterial and fungal communities in mangroves dominated by three tree species across different provinces in China. At the same time, we analyzed soil physicochemical properties and climatic factors to identify key drivers of microbial distributions.</p> Results and discussion <p>Our results revealed that microbial community composition and function varied significantly across regions, with limited influence from tree species. Notably, bacterial communities exhibited stronger regional differentiation than fungal communities. Environmental factors, such as soil salinity, carbon content, carbon : nitrogen ratio, temperature and precipitation, were key determinants of microbial composition and metabolic potentials across regions. Notably, the averaged Gram-positive to Gram-negative bacteria ratio (about 0.176) was lower than the assumed ratio (about 1.857) for microbial residual carbon calculation, suggesting underestimations of soil microbial contributions to carbon sequestration in mangrove ecosystems due to a trend in bacterial community shift towards Gram-negative dominance.</p> Conclusions <p>The study reveals substantial regional variations in mangrove sediment microbial communities while maintaining stable across tree species, with their regional specificity jointly shaped by climatic and soil properties. At the same time, the bacterial community in mangrove soils tend to shift to a Gram-negative dominance, which may further affect the microbial contribution to soil carbon sequestrations. These findings provide us with new insights into the microbial community dynamics in mangrove soil.</p> Graphical abstract <p></p>

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The composition and function of soil microbial communities in mangroves vary with geographic regions rather than vegetation types

  • 期刊论文

  • 发表日期：

    2025年10月1日

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  • Kaijie Hu,
  • Yanmei Xiong,
  • Kun Xin,
  • Wei Guan,
  • Zhongmao Jiang,
  • Jie Chen

摘要

Purpose

Mangroves provide essential ecosystem functions such as carbon sequestration, biodiversity conservation, and nutrient cycling. Soil microbial communities play key roles in these processes, yet their distribution patterns in mangroves remain insufficiently understood across regions and vegetation types. Therefore, characterization and explanation of the performances in microbial structure and function with varied mangrove tree species and regions will be critical for a better understanding of the functions driven by mangrove microbiome.

Materials and methods

This study used 16 S rRNA and ITS gene sequencing to investigate the composition, diversity, and function of soil bacterial and fungal communities in mangroves dominated by three tree species across different provinces in China. At the same time, we analyzed soil physicochemical properties and climatic factors to identify key drivers of microbial distributions.

Results and discussion

Our results revealed that microbial community composition and function varied significantly across regions, with limited influence from tree species. Notably, bacterial communities exhibited stronger regional differentiation than fungal communities. Environmental factors, such as soil salinity, carbon content, carbon : nitrogen ratio, temperature and precipitation, were key determinants of microbial composition and metabolic potentials across regions. Notably, the averaged Gram-positive to Gram-negative bacteria ratio (about 0.176) was lower than the assumed ratio (about 1.857) for microbial residual carbon calculation, suggesting underestimations of soil microbial contributions to carbon sequestration in mangrove ecosystems due to a trend in bacterial community shift towards Gram-negative dominance.

Conclusions

The study reveals substantial regional variations in mangrove sediment microbial communities while maintaining stable across tree species, with their regional specificity jointly shaped by climatic and soil properties. At the same time, the bacterial community in mangrove soils tend to shift to a Gram-negative dominance, which may further affect the microbial contribution to soil carbon sequestrations. These findings provide us with new insights into the microbial community dynamics in mangrove soil.

Graphical abstract