In this work, the turbulent covariance technique was used to estimate the surface fluxes of carbon (CO 2 ) and energy, latent (LE) and sensitive (H), over a native field ecosystem (pasture). The results show that the ecosystem in question presents a predominant seasonality in its ecological nctioning, especially regarding the observations of the flow of LE and CO 2 , with carbon assimilation and evapotranspiration with maximum values during the summer. During the winter season, observations point to a lower metabolic state of the ecosystem, with almost zero carbon assimilation (even a carbon source signal inversion) and the evapotranspiration rate falling to 60% of its value in the state of higher metabolic activity
