Land use and occupation analysis of Permanent Preservation Areas in Lavras County, MG

Abstract

The Permanent Preservation Areas (PPAs) are considered essential for the maintenance of local biodiversity, so that your protection is regulated by the Brazilian legislation. This work had the objective of delimiting permanent preservation areas according to determinations of the current Brazilian environmental legislation, and identify the occurrence of conflict between the land use and legislation in Lavras county, MG, by combination of technologies of remote sensing and geographic information systems. The PPAs correspond to 42.33% of Lavras county's territory. The conflict between the land use and environmental legislation occurs in 63.48% of PPAs' territory, mainly corresponding to the pasture areas, bare soil and agriculture. The PPAs of tops of hills showed the highest conflicts with the legislation, with 48.48% of the territory occupied by pastures, and 13.62% by agriculture. The PPAs located in the surrounding of water courses and in the slopes with declivity higher than 45º presented 59.99% and 92.03%, respectively of the territory occupied by native vegetation of semi-deciduous forest and natural fields.Index terms: Environmental legislation, land cover, geoprocessing. RESUMOAs Áreas de Preservação Permanente (APPs) são consideradas essenciais para a manutenção da biodiversidade local, de modo que a sua proteção é regulamentada pela legislação brasileira. Neste trabalho, objetivou-se delimitar as áreas de preservação permanente de acordo com as determinações da legislação ambiental brasileira vigente, e identificar a ocorrência de conflito entre o uso da terra e a legislação no município de Lavras, MG, mediante a combinação de tecnologias de sensoriamento remoto e sistemas de informações geográficas. As APPs correspondem a 42,33% do território do munícipio de Lavras. O conflito entre o uso da terra e a legislação ambiental ocorre em 63,48% do território das APPs, correspondendo principalmente as áreas de pastagem, solo exposto e agricultura. As APPs de topos de morro foram as que apresentaram maiores conflitos com a legislação, com 48,48% do seu território ocupado por pastagens e 13,62% ocupado pela agricultura. As APPs localizadas no entorno dos cursos d'água e nas encostas com declividade superior a 45º apresentaram, respectivamente, 59,99% e 92,03% do seu território ocupados por vegetação nativa de floresta semidecídua e campos naturais.

Land use in Permanent Preservation Areas of Grande River (MG)

“…The Kappa coefficient is a good indicator of mapping accuracy . According to some authors (Oliveira et al, 2008;Reis et al, 2012), values between 0.8 and 1.0 for this coefficient indicate the classification presented excellent results. Table 3 shows the confusion matrix.…”

“…Rapideye images have 5 m spatial resolution, five-band spectral resolution (blue, 440-510 nm, green, 520-590 nm, red, 630-685 nm, red-edge, 690-730 nm and near infrared, 760 nm-850 nm) and are marketed with high resolution geometric correction preprocessing (Reis et al, 2012). The acquired image was analyzed in the false 5R 3G 2B color composition and its interpretation was made based on visual elements like texture, shape, tone and size (Pinto et al, 2005;Oliveira et al, 2008;Nardini et al 2012;Moreira et al, 2015).…”

“…The confusion matrix shows the number of pixels correctly classified and the number of pixels estimated by the classification for each class (Oliveira et al, 2008(Oliveira et al, , 2013Reis et al, 2012). Global accuracy is calculated by the ratio between the sum of the number of samples of the main diagonal of the confusion matrix and the total number of samples of that matrix.…”

“…Currently, these anthropic actions have led to intense degradation of PPAs (Reis et al, 2012;Luppi et al, 2015;Moreira et al, 2015).…”

Analysis of Spatiotemporal Changes in Land Use and Land Cover in Sub-Watersheds of the Lower Itapecuru River in the State of Maranhão, Brazil

“…To Shi et al (2013) and Bezerra e Silva (2014) such evaluations allow mapping the areas of greatest susceptibility to erosive processes. Other research indicates that the maps are the basis for the analysis of integrity permanent preservation areas (REIS et al, 2012;NERY et al, 2013) and allow the identification/management of land use conflicts (MELO et al, 2010;PACHECO et al, 2014).…”