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Purpose <p>Soil microbial communities and their enzyme-linked functional capacities regulate carbon stabilization and turnover, yet ecosystem-specific patterns remain poorly resolved in tropical ecosystems. This study examines bacterial diversity, community structure, and predicted functional potential in mangrove and terrestrial forest soils to identify microbial associations related to carbon storage and remineralization.</p> Methods <p>High-throughput 16&#xa0;S rRNA gene sequencing was performed on mangrove and terrestrial soil samples to characterize taxonomic composition. Functional analyses were conducted to infer metabolic pathways related to carbon, sulfur, and nitrogen cycling. LEfSe identified ecosystem-specific biomarkers, while Spearman correlations linked dominant taxa and pathways with soil physicochemical parameters and carbon pool fractions.</p> Results <p>Distinct ecosystem-specific microbial assemblages were observed. Mangrove sediments, shaped by higher salinity, fine texture, and elevated passive carbon pools, were enriched in <i>Novosphingobium</i>, <i>Erythrobacter</i>, <i>Flavobacterium</i>, and unclassified bacteria, with Rhodobacterales and Pirellulales identified as biomarkers. Predicted functions such as fermentation, sulfur respiration, and hydrogen-based metabolisms showed positive associations with passive carbon and negative associations with dissolved oxygen, consistent with anaerobic conditions linked to slower organic matter turnover. Conversely, terrestrial soils with higher carbon lability and active pools showed enrichment of <i>Sphingomonas</i>, <i>Allorhizobium</i>, and Acidobacteriota, with Burkholderiales and Tepidisphaerales representing dominant biomarkers. Predicted oxidative nitrogen and methane transformation functions were positively associated with dissolved oxygen and active carbon pools, indicating enhanced remineralization under oxic conditions.</p> Conclusion <p>Contrasting redox and carbon conditions in mangrove and terrestrial soils were associated with differences in microbial predicted functional profiles related to carbon processing. These findings suggest that ecosystem-specific microbial functional organization may influence carbon stabilization and turnover across blue- and green-carbon systems.</p> Graphical Abstract <p></p>

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Microbial Diversity and Functional Profiles Reveal Contrasting Carbon Storage and Remineralization Processes Across Mangrove and Terrestrial Soils

  • 期刊论文

  • 发表日期：

    2026年3月23日

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  • Mayukhmita Ghose,
  • Ashutosh Shankar Parab,
  • Cathrine Sumathi Manohar

摘要

Purpose

Soil microbial communities and their enzyme-linked functional capacities regulate carbon stabilization and turnover, yet ecosystem-specific patterns remain poorly resolved in tropical ecosystems. This study examines bacterial diversity, community structure, and predicted functional potential in mangrove and terrestrial forest soils to identify microbial associations related to carbon storage and remineralization.

Methods

High-throughput 16 S rRNA gene sequencing was performed on mangrove and terrestrial soil samples to characterize taxonomic composition. Functional analyses were conducted to infer metabolic pathways related to carbon, sulfur, and nitrogen cycling. LEfSe identified ecosystem-specific biomarkers, while Spearman correlations linked dominant taxa and pathways with soil physicochemical parameters and carbon pool fractions.

Results

Distinct ecosystem-specific microbial assemblages were observed. Mangrove sediments, shaped by higher salinity, fine texture, and elevated passive carbon pools, were enriched in Novosphingobium, Erythrobacter, Flavobacterium, and unclassified bacteria, with Rhodobacterales and Pirellulales identified as biomarkers. Predicted functions such as fermentation, sulfur respiration, and hydrogen-based metabolisms showed positive associations with passive carbon and negative associations with dissolved oxygen, consistent with anaerobic conditions linked to slower organic matter turnover. Conversely, terrestrial soils with higher carbon lability and active pools showed enrichment of Sphingomonas, Allorhizobium, and Acidobacteriota, with Burkholderiales and Tepidisphaerales representing dominant biomarkers. Predicted oxidative nitrogen and methane transformation functions were positively associated with dissolved oxygen and active carbon pools, indicating enhanced remineralization under oxic conditions.

Conclusion

Contrasting redox and carbon conditions in mangrove and terrestrial soils were associated with differences in microbial predicted functional profiles related to carbon processing. These findings suggest that ecosystem-specific microbial functional organization may influence carbon stabilization and turnover across blue- and green-carbon systems.

Graphical Abstract