Soil CO2 efflux fluctuates in three different annual seasons in a semideciduous tropical forest in Yucatan, Mexico

Tropical forest soils store a third of the global terrestrial carbon and control dioxide (CO2) effluxes to atmosphere produced by root microbial respiration. Soil CO2 efflux varies in time space is known be strongly influenced soil temperature water content. However, little about influence seasonality on efflux, especially tropical dry forests. This study evaluated temperature, volumetric content semideciduous Yucatan Peninsula under two sites (flat areas close far from hills), three seasons: dry, wet, early (a transition between rainy seasons) throughout year. Additionally, six 24-h periods were measured within these seasons. The mean annual was 4±2.2 ?mol m-2 s-1, like during season. In all seasons, increased linearly with moisture, which explained 45% spatial-temporal variation efflux. higher than hills some months. daily less important its spatial seasonal likely due small diel variations temperature. Transition seasons are common many forests, they should taken into consideration have better understanding future climate-change scenarios.