Temporal variability of soil CO2 eflux in a forest ecosystem in the eastern Amazon
DOI:
https://doi.org/10.5902/2179460X82194Keywords:
Tropical rainforest, Seasonality, Soil CO2 emissionAbstract
Greenhouse gas (GGE) emissions cause global warming and contribute to the loss of carbon from soils. Soil CO2 efflux (Esoil) plays a significant role in the carbon cycle of humid tropical forests. The objective of the work was to evaluate and quantify the Esoil in a primary forest ecosystem at different time scales during two years in the Eastern Amazon. The Esoil was higher in the rainy season (RS) (5.80 ± 0.34 µmol m-2 s-1) compared to the dry season (DS) (5.66 ± 0.16 µmol m-2 s-1) in 2016. In 2017, Esoil averages was higher in DS (5.52 ± 0.34 µmol m-2 s-1) compared to RS (4.98 ± 0.52 µmol m-2 s-1). Esoil showed no significant differences between RS and DS in 2016. The smallest Esoil was found in RS compared to DS in 2017 and had little dependence on soil moisture and temperature variables. Therefore, other variables need to be considered in the interdependence of physical and biogeochemical soil factors in the interannual variability of soil for forest ecosystems.
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