Effect of conversion of native vegetation on agricultural areas on biophysical variables in the transition region of Cerrado-Amazonia

The objective of this work was to evaluate the effect of the conversion of native vegetation on agricultural areas based on Normalized Difference Vegetation Index (NDVI), surface albedo (α), brightness temperature (Tb) and net radiation (Rn) in Cerrado-Amazon transition area with Landsat images 8. The classes of land use studied were: Native forest (FN), Irrigated area (AI) and Not irrigated (AN) with agronomic crops in scenes 331 of 2015, 094 and 206 of 2016 of a farm in the North Center of the state of Mato Grosso. From the information obtained from the images together with the Automatic Smile Meteorological Station (EMA) - MT, was calculated the net radiation. The conversion of native forest to agricultural areas in the Cerrado-Amazon transition region exerts an increase in the surface albedo and the brightness temperature values and a decrease in the NDVI, consequently the reduction of the values of the net radiation. The mean values of NDVI, α, Tb and Rn found in the FN (0,86, 0,16, 24,44 °C and 598,80 W m²), AI (0,79, 0,22, 24,90 °C and 549,74 W m²) and AN (0,53; 0,28, 28,78 °C and 486,48 W m²) evidences the effect of the conversion of native vegetation in agricultural areas based on biophysical indices.