04 Feb 2022
04 Feb 2022
Status: this preprint is currently under review for the journal BG.

Greenhouse gas fluxes in mangrove forest soil in the Amazon estuary

Saúl Edgardo Martínez Castellón1, José Henrique Cattanio1, José Francisco Berrêdo1,3, Marcelo Rollnic2, Maria de Lourdes Ruivo1,3, and Carlos Noriega2 Saúl Edgardo Martínez Castellón et al.
  • 1Graduate Program in Environmental Sciences. Federal University of Pará, Belém, Brazil
  • 2Marine Environmental Monitoring Research Laboratory. Federal University of Pará, Belém, Brazil
  • 3Department of Earth Sciences and Ecology. Paraense Emílio Goeldi Museum, Belém, Brazil

Abstract. Tropical mangrove forests are important carbon sinks, the soil being the main reservoir of this chemical element. Understanding the variability and the key factors that control fluxes is critical to account for greenhouse gas (GHG) emissions, especially in a scenario of global climate change. The current study is the first to quantify methane (CH4) and carbon dioxide (CO2) emissions using a dynamic chamber in Amazon natural mangrove soils. Sampling points were selected in a contrasting topographic gradient, the highest point being where flooding occurs only at high tides during the solstice and on the high tides of the rainy season of the new and full moons. The results showed that mangrove soils are sources of greenhouse gases, and CO2 fluxes were not different between seasons, and only in the dry period were they greater in the high topography. Only in the low topography, the CH4 fluxes were higher in the rainy season. However, in the dry period, the low topography soil produced more CH4. Soil organic matter, carbon and nitrogen ratio (C / N), and redox potential influenced the annual and seasonal variation of CO2 emissions; however, they did not influence CH4 flux. To account for global GHG emissions, in the Amazonian estuary mangrove soil produced 35.4 Mg CO2-eq ha−1 yr−1.

Saúl Edgardo Martínez Castellón et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on bg-2021-325', Anonymous Referee #1, 09 Mar 2022
    • AC1: 'Reply on RC1', José Henrique Cattanio, 07 Apr 2022
  • RC2: 'Comment on bg-2021-325', Anonymous Referee #2, 14 Mar 2022
    • AC2: 'Reply on RC2', José Henrique Cattanio, 07 Apr 2022

Saúl Edgardo Martínez Castellón et al.

Saúl Edgardo Martínez Castellón et al.


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Short summary
We seek to understand the influence of climatic seasonality and microtopography on CO2 and CH4 fluxes in an Amazonian mangrove. Topography and seasonality had a contrasting influence when comparing the two gas fluxes, that is, CO2 fluxes were greater in the high topography in the dry period, and CH4 fluxes were greater in the rainy season in the low topography. Only CO2 fluxes were correlated with soil organic matter, the proportion of carbon and nitrogen, and redox potential.