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Gas fluxes of CO₂ and CH₄ from mangrove soils are strongly regulated by tidal dynamics, which alter oxygen availability, sediment–water interactions, and microbial activity. Measurements conducted under exposed and flooded conditions across three mangrove sites on the Ajuruteua Peninsula reveal distinct patterns of gas exchange shaped by vegetation type, soil saturation, salinity, and the presence of pneumatophores. Exposed soils showed constrained CO₂ efflux due to intense anoxia during the wet season, whereas pneumatophore-rich areas facilitated CH₄ release by channeling gases from deeper layers. Flood conditions altered efflux pathways, enhancing diffusion at the water–air interface and facilitating dissolved gas exchange within the water column. Differences among vegetation physiognomies highlighted the role of plant functional traits and hydrological setting in determining emission pathways. These results underscore the need to incorporate tidal stage, vegetation structure, and soil conditions into mangrove carbon-flux assessments, particularly in macrotidal Amazonian environments.

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Diffuse Flux Rates of CO₂ and CH4 in Flooded and Exposed Mangrove Soils on the Amazon Coast

  • 章节

  • 发表日期：

    2026年

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  • Hudson Cleber Pereira da Silva,
  • Paulo César da Costa Virgulino-Júnior,
  • Marcus Emanuel Barroncas Fernandes

摘要

Gas fluxes of CO₂ and CH₄ from mangrove soils are strongly regulated by tidal dynamics, which alter oxygen availability, sediment–water interactions, and microbial activity. Measurements conducted under exposed and flooded conditions across three mangrove sites on the Ajuruteua Peninsula reveal distinct patterns of gas exchange shaped by vegetation type, soil saturation, salinity, and the presence of pneumatophores. Exposed soils showed constrained CO₂ efflux due to intense anoxia during the wet season, whereas pneumatophore-rich areas facilitated CH₄ release by channeling gases from deeper layers. Flood conditions altered efflux pathways, enhancing diffusion at the water–air interface and facilitating dissolved gas exchange within the water column. Differences among vegetation physiognomies highlighted the role of plant functional traits and hydrological setting in determining emission pathways. These results underscore the need to incorporate tidal stage, vegetation structure, and soil conditions into mangrove carbon-flux assessments, particularly in macrotidal Amazonian environments.