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2006-Aiga Jucy Fuchshuber da Silva Caldas.pdf: 6021585 bytes, checksum: 9535f5d5885faef6e2d236e33222aa43 (MD5)
Previous issue date: 2006-06-28 === The principal goal of this paper is the formulation of a methodology that allowed the
delimitation of the more suitable areas to corridors on Serra da Conc?rdia, Para?ba River
Valley, Rio de Janeiro State, using geoprocessing tools. The fragmentation status and the
permanent preservation areas status were processed and analysed. Were also processed the
soils, the use of the land, the legal destination of the areas, slope, aspect and surfaces
curvature, generating thematics maps on a 1:50.000 scale. The steps were produced with the
softwares Arcview, Armap, Arcinfo, GPS Track Maker e PCOrd. There were determined
weights between zero and one to the attributes of the themes according to their suitability of
forest recovering. These themes were then processed with map algebra to generate the areas
according to their potential for the establishment of corridors. To evaluate the dynamics of the
forest recovering in the period between 1985 and 2004 were used images of different sensors.
There were found six soils classes, the most representative of them Cambissolos H?plicos tb
distrt?ficos, that in association with Latossolo Vermelho-Amarelo distr?fico occupies 79,8%
of the area. The secondary forests occupy the south faces of the hills much more than the
north faces. The stages medium and advanced of the secondary forests represent about 49% of
the area and are distributed in 72 fragments, two of them bigger than 1.000 ha. The permanent
preservation areas represent 53% of Serra da Conc?rdia, being 62.3% of them recovered with
secondary forest vegetation. There was a real increment of about 200 ha in the forested areas
between 1985 and 2004. The distance among the fragments is small, only one of them is farer
than 350 meters, which facilitates dispersion. However the fragments outlines are very
irregulars and they have larges border areas, making them more vulnerables. The
methodology used to generate the more suitable areas for corridors was efficient. === O objetivo principal deste trabalho foi elaborar metodologia que permitisse determinar as
?reas mais adequadas para instala??o de corredores de h?bitat na regi?o da Serra da
Conc?rdia, Vale do Para?ba, Estado do Rio de Janeiro, utilizando ferramentas de
geoprocessamento. Foram levantados e analisados a situa??o atual da fragmenta??o florestal e
das ?reas de preserva??o permanente da regi?o, al?m dos solos e do uso da terra. A partir do
modelo digital de eleva??o foram derivados os temas de declividade, faces de orienta??o e a
curvatura das superf?cies, todos na escala 1:50.000. Foram utilizando os programas Arcview,
Armap, Arcinfo, GPS Track Maker e PCOrd. Todos os temas selecionados foram convertidos
para o formato matricial e para seus atributos foram estabelecidos pesos com valores entre 0 e
1, de acordo com a sua adequabilidade para recupera??o natural da vegeta??o florestal com a
finalidade de formar corredores. Estes temas foram posteriormente processados atrav?s de
?lgebra de mapa para determinar as ?reas com maior potencial para estabelecimento de
corredores de vegeta??o. Para avalia??o da din?mica da cobertura florestal no per?odo de
1985 a 2004 foram utilizadas imagens de diferentes sensores. Foram encontradas seis classes
de solos, das quais a mais representativa ? a dos Cambissolos H?plicos tb distrt?ficos, que
associado ao Latossolo Vermelho-Amarelo distr?fico ocupa 79,8% da ?rea. A vegeta??o
florestal est? mais presente na face sul do que na face norte das vertentes. A vegeta??o
secund?ria nos est?gios m?dio e avan?ado de regenera??o representa cerca de 49% da ?rea e
est? distribu?da em 72 fragmentos, dois dos quais maiores que 1.000 ha. As ?reas de
preserva??o permanente ocupam 53% da Serra, estando 62,3% cobertos por vegeta??o
secund?ria nos est?gios m?dio e avan?ado de regenera??o. As regi?es ciliares s?o as ?reas de
preserva??o permanente menos preservadas. No per?odo de 1985 a 2004 houve um aumento
real de aproximadamente 200 ha de ?rea de florestas. A dist?ncia entre os fragmentos ?
pequena, apenas um est? a mais de 350m, o que facilita a dispers?o de prop?gulos e de
indiv?duos. No entanto, os contornos dos fragmentos s?o bastante irregulares, com grande
?rea de borda, o que os deixa mais vulner?veis. A metodologia utilizada mostrou-se eficiente
para escolha das ?reas mais adequadas para estabelecimento de corredores de h?bitat.
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