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<p>Mangrove ecosystems are globally recognized for their blue carbon (C) sequestration capacity. Lignocellulosic detritus constitutes the primary C input to mangrove sediments, but the microbial processes involved in its bioprocessing remain unclear. Using lignocellulosic analysis and metagenomic sequencing across five 100-cm sediment cores, we found a high proportion of lignin (95.0–97.7%) within sediments’ lignocellulosic detritus, with a small fraction of lignin-degrading genes (1.24–1.98%) of lignin-degrading genes within the carbohydrate-active enzyme coding genes. Depth stratification was observed in genes and microbial communities involved in lignin depolymerization and mineralization of lignin monomer derivatives. Further microbe-centered analyses of biomass production rates and adaptive metabolism revealed diminished microbial C use efficiency potential and augmented “enzyme latch” with increasing sediment depths. These findings enhance our understanding of sedimentary organic C cycling and storage in coastal blue C ecosystems.</p>

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Depth heterogeneity of lignin-degrading microbiome and organic carbon processing in mangrove sediments

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年1月6日

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  • Jijuan Ding,
  • Fei Liu,
  • Jiaxiong Zeng,
  • Hang Gu,
  • Jing Huang,
  • Bo Wu,
  • Longfei Shu,
  • Qingyun Yan,
  • Zhili He,
  • Cheng Wang

摘要

Mangrove ecosystems are globally recognized for their blue carbon (C) sequestration capacity. Lignocellulosic detritus constitutes the primary C input to mangrove sediments, but the microbial processes involved in its bioprocessing remain unclear. Using lignocellulosic analysis and metagenomic sequencing across five 100-cm sediment cores, we found a high proportion of lignin (95.0–97.7%) within sediments’ lignocellulosic detritus, with a small fraction of lignin-degrading genes (1.24–1.98%) of lignin-degrading genes within the carbohydrate-active enzyme coding genes. Depth stratification was observed in genes and microbial communities involved in lignin depolymerization and mineralization of lignin monomer derivatives. Further microbe-centered analyses of biomass production rates and adaptive metabolism revealed diminished microbial C use efficiency potential and augmented “enzyme latch” with increasing sediment depths. These findings enhance our understanding of sedimentary organic C cycling and storage in coastal blue C ecosystems.