Phylogenetically and metabolically diverse active carbon-fixing microbes reside in mangrove sediments.

ABSTRACT:

Background

Mangroves are hotspots of carbon sequestration in transitional zones between marine and terrestrial ecosystems. Microbially driven dark carbon fixation (DCF) is prominent in sediments, yet our understanding of the DCF process across this continuum remains limited. In this study, we explored DCF activities and associated chemoautotrophs along the sediment depth of different mangrove sites in Fujian Province, China, using radiocarbon labeling and molecular techniques.

Results

Our results showed that the DCF rates ranged from 0.02 to 3.27 mmol C m^-2 day^-1 in all samples, showing a depth-dependent spatial variation. These rates of DCF were closely related to the environmental factors such as DIC, TS, AVS, NH₄⁺, NO₃

SUBMITTER: Wang S 

PROVIDER: S-EPMC12400630 | biostudies-literature | 2025 Sep

REPOSITORIES: biostudies-literature