Dinâmicas de regeneração, degeneração e desmatamento da vegetação provocadas por fatores climáticos e geomorfológicos: uma análise geoecológica através de SIG

Silveira, Carla Semiramis; Silva, Viviane Vidal da

doi:10.1590/s0100-67622010000600008

Cited by 13 publications

(14 citation statements)

References 7 publications

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“…The results obtained by Silveira and Silva (2010) of the interactions between vegetation cover dynamics and aspect in the Paquequer River basin in Teresópolis, Rio de Janeiro, are similar with the results of this study. These authors found that the forest fragments evolved to advanced stages of forest regeneration, preferably on south-facing slopes, and the favorable characteristics of the aspect presented relevance only to regeneration processes in advanced stages but not for those in early stages.…”

Section: Discussionsupporting

confidence: 89%

Potential Areas for the Formation of Ecological Corridors Between Remnants of Atlantic Forest

et al. 2016

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-In Brazil, the remaining areas of Atlantic Forest are intensely fragmented. The connection of forest fragments through ecological corridors is an important step in biodiversity conservation. Certain areas are more resilient, and in those areas, natural forest regeneration, for example, can be encouraged. The aim of this study was to identify areas of greater resilience in order to support the connection of Atlantic Forest fragments with ecological corridors. Forest fragments in the municipality of Paraíba do Sul, in the state of Rio de Janeiro, were mapped using the supervised maximum likelihood classification of an Operational Land Imager (OLI)/Landsat-8 sensor image. Next, we analyzed the influence of terrain attributes (aspect, incident solar radiation, slope, and curvature profile) on natural regeneration. The areas with the greatest potential to achieve natural regeneration and to form ecological corridors were indicated through fuzzy membership functions. Within Paraíba do Sul, 31% of the territory is covered by vegetation in different stages of regeneration. Recordings were made of 1,251 forest fragments in a middle or advanced stage of regeneration. These fragments are usually situated in the southeast, south, and southwest aspects, in areas that receive the least amount of global solar radiation (Wh·m -2 ) per year, and on slopes with an angle of inclination greater than 20%. The adjustment of fuzzy functions identified 17,327.5 ha with a tendency to recover, and which are therefore strategic areas in the development of ecological corridors.Keywords: Resilience; Forest fragmentation; Remote sensing. ÁREAS POTENCIAIS À FORMAÇÃO DE CORREDORES ECOLÓGICOS ENTRE REMANESCENTES DE MATA ATLÂNTICARESUMO -No Brasil, a Mata Atlântica remanescente é intensamente fragmentada. A conexão de fragmentos florestais através de corredores ecológicos é um passo importante para a conservação da biodiversidade. Determinados locais da paisagem têm maior resiliência e a regeneração natural, por exemplo, pode ser favorecida. Neste trabalho fragmentos florestais remanescentes de Mata Atlântica, no município de Paraíba do Sul, RJ, foram mapeados. Utilizou-se a classificação supervisionada, por máxima verossimilhança, de uma imagem do sensor OLI/Landsat-8; analisou-se a influência de atributos do terreno (face de exposição, radiação solar, declividade e perfil de curvatura) na regeneração natural; e, as áreas com maior potencial para condução da regeneração natural e formação de corredores ecológicos foram indicadas através de pertinência fuzzy. Paraíba do Sul tem 31% do território coberto por vegetação em diferentes estágios de regeneração. Foram contabilizados 1.251 fragmentos florestais em estágio médio ou avançado de 804Revista Árvore, Viçosa-MG, v.40, n.5, p.803-813, 2016 SANTOS, J.F.C. et al.regeneração situados, preferencialmente, nas vertentes sudeste, sul e sudoeste, as quais recebem menor quantidade de radiação solar global (Wh.m -2 ) por ano, e em declividades superiores a 20%. O ajuste de funções fuzzy perm...

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Section: Discussionsupporting

confidence: 89%

Potential Areas for the Formation of Ecological Corridors Between Remnants of Atlantic Forest

et al. 2016

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“…Entretanto, a distribuição da cobertura florestal nas paisagens estudadas em Vassouras foi homogênea entre as diferentes faces de exposição, similar ao encontrado em uma área de floresta montana densa no interior de São Paulo (Silva et al, 2007). É possível que outros fatores tenham agido, impedindo a detecção do padrão esperado, pois a regeneração de florestas em áreas muito impactadas pode ocorrer independentemente dos fatores abióticos (Silveira & Silva, 2010). No caso de Vassouras, a distribuição da cobertura florestal sofreu grande influência das lavouras de café.…”

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A Cobertura Florestal em Paisagens do Médio Vale do Rio Paraíba do Sul

2017

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A contínua substituição da cobertura florestal pelo cultivo agrícola e a urbanização causaram alterações na maior parte do bioma Mata Atlântica no Brasil. O entendimento da interação entre os fatores físicos, antrópicos e da cobertura vegetal em uma paisagem é de fundamental importância para oferecer subsídios ao planejamento territorial de forma sustentável. Este estudo investigou a influência da altitude, declividade e orientação das vertentes na cobertura florestal em três diferentes paisagens no município de Vassouras, RJ. No geral, as áreas analisadas apresentaram a cobertura florestal fragmentada, porém foi observada uma paisagem com maior cobertura florestal do que pastagens. Entre as variáveis analisadas, a altitude e a declividade apresentaram uma relação positiva com a cobertura florestal. As paisagens estavam inseridas em diferentes contextos socioeconômicos que podem também determinar a distribuição da cobertura florestal atual. A região estudada oferece atributos socioambientais específicos de cada paisagem, cuja compreensão deve ser útil ao planejamento ambiental.Palavras-chave: fragmentação florestal, ecologia de paisagens, uso do solo, pastagens, vassouras. Forest Cover in Landscapes of the Middle Valley of Paraiba River ABSTRACTThe continuous replacement of forest covers for crops and urban areas changed most of the Atlantic Forest biome in Brazil. Hence, understanding the interaction between the forest cover, physical and anthropic factors in a landscape is essential in order to provide subsidies for sustainable land use. The present study aimed at investigating the influence of the altitude, declivity, and slope orientation on the forest cover of three landscapes in the municipality of Vassouras. In general, Vassouras showed fragmented forest covers, but we observed a landscape covered more by forests than pastures. Among the variables analyzed, altitude and declivity showed a positive relationship with forest cover. The analyzed landscapes were inserted in different socio-economical contexts, which can also affect the current forest cover distribution. The socio-environmental attributes of those landscapes are specific and their understanding can be strategic for environmental planning.

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“…Studies involving population dynamics report that several factors can influence the development of ecosystems, including changes to their current regeneration status leading plant populations into unknown patterns of dynamics (Silveira & Silva 2010;O'Brien et al 2012). The most commonly reported of these factors in the literature are climatic fluctuations and anthropic actions, the latter also including chronic anthropogenic disturbances (Singh 1998;Silveira & Silva 2010;Martorell & Peters 2005;O'Brien et al 2012), which can have a direct influence on forest cycles and altering the response time of plant communities (Feeley et al 2011).…”

Section: Introductionmentioning

confidence: 99%

“…The most commonly reported of these factors in the literature are climatic fluctuations and anthropic actions, the latter also including chronic anthropogenic disturbances (Singh 1998;Silveira & Silva 2010;Martorell & Peters 2005;O'Brien et al 2012), which can have a direct influence on forest cycles and altering the response time of plant communities (Feeley et al 2011). Chronic anthropogenic disturbances are continuous human actions of biomass removal from forest resources that have deleterious effects at population, community and ecosystem levels, but do not result in abrupt and complete environmental changes (Singh 1998;Martorell & Peters 2005).…”

Section: Introductionmentioning

confidence: 99%

Temporal evaluation of the Conservation Priority Index for medicinal plants

et al. 2017

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We investigated, through a temporal comparison, the extraction of non-timber forest resources by quantitatively analyzing the Conservation Priority Index (CPI). Th e study focused on the Fulni-ô Indigenous Territory, in the municipality of Águas Belas, PE (Northeast Brazil), which is characterized by caatinga vegetation (seasonal dry forest). Information on the availability of the exploited resources and the reported use of the species were obtained from vegetation sampling and semi-structured interviews, respectively. Our results demonstrated a reduction in species richness overtime, which may be due to continued resource extraction in the area, and that some species with low densities were even more aff ected. Th e species reported as being at high risk in the current study apparently did not diff er from their status in the previous study, which supports the idea that these species are most evident in this situation more for their high potential of use than for their high densities. When we associate these events together with the disappearance of some rare species, we can conclude that the CPI was not effi cient in predicting changes, and that the combination of variables used with the biological variables of the species needs to be adjusted.

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Dinâmicas de regeneração, degeneração e desmatamento da vegetação provocadas por fatores climáticos e geomorfológicos: uma análise geoecológica através de SIG

Cited by 13 publications

References 7 publications

Potential Areas for the Formation of Ecological Corridors Between Remnants of Atlantic Forest

Potential Areas for the Formation of Ecological Corridors Between Remnants of Atlantic Forest

A Cobertura Florestal em Paisagens do Médio Vale do Rio Paraíba do Sul

Temporal evaluation of the Conservation Priority Index for medicinal plants

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