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

作者：Jijuan Ding, Fei Liu, Jiaxiong Zeng, Hang Gu, Jing Huang, Bo Wu, Longfei Shu, Qingyun Yan, Zhili He, Cheng Wang · 发表于：npj Biofilms and Microbiomes · 年份：2025 · DOI：10.1038/s41522-024-00638-x · 被引用次数：17 · 研究领域：Coastal wetland ecosystem dynamics、Microbial Community Ecology and Physiology、Peatlands and Wetlands Ecology

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.