Caracterização biofísica das pastagens na bacia hidrográfica do Rio Vermelho (GO), bioma cerrado, Brasil

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2018

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The agricultural expansion in the Brazilian cerrado represents nowadays more than half of the total biome area, where conversion of the natural vegetation to pasturelands is the main dynamics more evident. Such transformations tend to create distinct spatial patterns regarding the biophysical behavior of the main existent vegetation formations, which can be identified and discriminated through a variety of available remote sensing products, and field surveys. This paper, by using the watershed of the Red river as an experimental unit of the Cerrado biome, aimed to make a biophysical analysis of pastures, from field sampling (biomass and spectroscopy) and a broad base of satellite data.From 1985, there was a significant advance of cultivated pastures over the natural pastures and in 2006, the exotic species represented approximately 91.3% of the total pastures present in the study area. The distribution of natural and cultivated pastures seems to be related to local edafoclimatic factors, such as soil (depth/lithic content) and water availability, which explain the occurrence of most grass species. There is a correspondence between pasture natural‚ and pasture cultivated‚ green biomass during the dry season, as opposed to the wet season. However, based on the seasonal moderate spatial resolution MODIS images, it is not possible to separate between natural and cultivated pastures.

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Pastagens, Avaliação biofísica, Cerrado, Pastures, Biophysics assessment

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SANTOS, Pablo Santana; FERREIRA, Laerte Guimarães; LENZI, Ítalo Luiz Corrêa. Caracterização biofísica das pastagens na bacia hidrográfica do Rio Vermelho (GO), bioma cerrado, Brasil. Boletim de Geografia, Maringá, v. 36, n. 3, p. 53-73, 2018. DOI: 10.4025/bolgeogr.v36i3.35269. Disponível em: https://periodicos.uem.br/ojs/index.php/BolGeogr/article/view/35269. Acesso em: 25 jul. 2024.