Evolution of Cerrado Vegetal Cover on a River Island Based on Orbital Imaging Data

Abstract

This study aimed to assess vegetal cover evolution on a river island within the Ecological Station of (EEP), by remote sensing. For this purpose, Normalized Difference Vegetation Indexes were generated for Landsat 1 (1973( ) and Landsat 5 (1984( , 1990( , 2000 images. Five landscape units were identified in the field: bare soil, Rough savanna, Typical savanna, Forested savanna and Evergreen dry woods. Only Forested savanna and Evergreen dry woods showed poor spectral splitting, being thus considered as a forestry complex. Changes throughout time have occurred in all units, with decreasing in bare soil areas (-2.56 ha year -1 ), Rough savanna (-0.66 ha year -1 ) and Typical savanna (-0.94 ha year -1 ) and with an increase in the Forested savanna (5.97 ha year -1 ). Thus, the method used in this study was effective for sorting and assessing plant cover of the landscape units studied over time.

Dendrochronology and growth of Copaifera langsdorffii wood in the vegetation dynamics of the Pirapitinga Ecological Station, state of Minas Gerais, Brazil

“…The detection of an arboreal individual with more advanced age refers to the period before the filling of the THPP dam, before the formation of this phytophysiognomy. In the study by Carvalho et al (2016) about the vegetation dynamics of the PES from orbital images, the academics found that the Mata Seca Sempre-Verde was consolidated in the 70s in areas where, originally, a typical Cerrado phytophysiognomy was established. In a study about the vegetation of the PES, Giácomo et al (2013Giácomo et al ( , 2015 revealed that, in addition to the high frequency of C. langsdorffii individuals in the Mata Seca Sempre-Verde, this species also occurs in other savannas vegetation, such as the Typical Cerrado and Campo Sujo Seco, but in a phytosociological positions less representative.…”

“…Some of these changes were the emergence, evolution and extinction of some Cerrado sensu lato phytophysiognomies at PES. The most noticeable change was the emergence of the Mata Seca Sempre-Verde phytophysiognomy, where savannah and grassland formations were previously established (CARVALHO et al, 2016). This Cerrado phytophysiognomy is located in lower parts of its relief.…”

“…This Cerrado phytophysiognomy is located in lower parts of its relief. Hence, it is subject to the influence of the water table, but it has no flooding periods (CARVALHO et al, 2016). The Mata Seca Sempre-Verde of the PES presents several tree species that are representative of this phytophysiognomy; C. langsdorffii being one of them (GIÁCOMO et al, 2015).…”

Landscape dynamics and its impacts in the Atlantic Forest area of Southeastern Brazil

“…Deforestation also compromised the conservation of natural resources, and there is a need for studies that can understand how the anthropic activities altered the landscape in order to understand the relations between its transformation and society. However, to evaluate the landscape dynamics of PEPS, it is essential to integrate tools capable of detecting and quantifying changes in the region (Carvalho et al, 2016).…”

Regeneração natural da vegetação arbórea e relações ambientais em dois fragmentos de cerrado sensu stricto

“…Por outro lado, a riqueza de espécies e famílias observada neste estudo foi superior à encontrada por diversos autores para a regeneração de cerrado sensu stricto nos Estados de Minas Gerais, São Paulo e no Distrito Federal (BARREIRA et al, 2002;MEDEIROS;PAULA et al, 2009;PEREIRA et al, 2014;REIS, 2018 BARREIRA et al, 2002;PEREIRA et al, 2014;REIS, 2018 Ao se comparar as espécies mais importantes na regeneração natural deste trabalho com outros estudos, observou-se que há poucas espécies em comum (BARREIRA et al, 2002;SENA;PEREIRA et al, 2014; (EITEN, 1994;SCHIAVINI, 2001;ASSIS et al, 2011;PAULA et al, 2015). A disponibilidade de água e nutrientes, aliado às ações antrópicas, podem explicar a ocorrência das diferentes fisionomias no Cerrado (ASSIS et al, 2011;DURIGAN et al, 2011;CARVALHO et al, 2016).…”