Changes resulting from land use and occupation modify the surface radioactive balance. This paper evaluated the impact on the net radiation caused by the conversion of a Cerrado area in an agricultural zone in the southern Mato Grosso using Landsat 5 TM sensor imagery acquired between June and October 2011. The analyses were performed of the following land use classes: Cerrado, riparian vegetation, sugarcane, soybean, pasture, bare soil and water. The replacement of Cerrado by agricultural areas changed the biophysical indices of the surface due to the change in biomass and the optical properties of the surface as observed in this study. The NDVI values were higher in the typical Cerrado vegetation and Riparian Forest than in agricultural areas. The surface temperature and the surface albedo showed an inverse pattern of NDVI, with lower values in the typical Cerrado vegetation and Riparian Forest and higher values in agricultural areas and bare soil. The replacement of Cerrado by cultivated crops in the south of Mato Grosso decreased the available energy at the surface, as indicated by the radiation balance.
A conversão da vegetação nativa para áreas agrícolas modifica a dinâmica de troca de energia no sistema soloplanta-atmosfera. Dessa forma, o objetivo deste estudo foi avaliar o efeito da conversão de uma área de Cerrado em culturas agronômicas no balanço de energia e evapotranspiração no sul do Estado de Mato Grosso. O estudo foi conduzindo em áreas de cerradão, cerrado stricto sensu, mangueiral, cultura de teca, coqueiral e pastagem.
Energy Balance in Terms of Land Use Changes in the Southern of Mato Grosso State
AbstractThe conversion of native vegetation to agricultural areas modifies the dynamics of energy exchange in the soil-plantatmosphere system. Thus, the objective of this study was to evaluate the effect in energy balance and evapotranspiration in the southern state of Mato Grosso due to the conversion of a Cerrado area in agronomic crops. The study was leading in areas of Cerradão, Cerrado strictu sensu, mango grove, teak culture, coconut trees and pasture. The energy balance was estimated by SEBAL (Surface Energy Balance Algorithm for Land) using weather station data and images from Landsat 5 TM sensor obtained in 2010. The net radiation showed lower values in pasture than in the Cerrado. The latent heat flux in the Cerrado was higher by 60% in relation to agronomic crops. The sensible heat flux in agricultural areas were 50% higher than Cerrado areas. The Cerradão and Mangueiral showed lower heat flux values on the ground. Although this study does not represent the entire Cerrado of Mato Grosso, the results showed the impact of the Cerrado into agricultural areas in the energy balance.
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