Ocorr?ncia, distribui??o e influ?ncia de plantas ex?ticas sobre a comunidade vegetal nativa do Parque Nacional da Serra dos ?rg?os, RJ

• Ano de defesa: 2009
• Autor(a) principal: Barroso, Fl?vio Guerra
• Orientador(a): Medeiros, Rodrigo
• Banca de defesa: Garay, Irene Ester Gonzales, Freitas, Andr? Felippe Nunes de
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal Rural do Rio de Janeiro
• Programa de Pós-Graduação: Programa de P?s-Gradua??o em Ci?ncias Ambientais e Florestais
• Departamento: Instituto de Florestas
• País: Brasil
• Palavras-chave em Português: Contamina??o biol?gica; Esp?cies ex?ticas invasoras; Mata Atl?ntica
• Palavras-chave em Inglês: Biological contamination; Invasive exotic species; Atlantic Forest
• Área do conhecimento CNPq: Recursos Florestais e Engenharia Florestal
• Link de acesso: https://tede.ufrrj.br/jspui/handle/jspui/1946

The biological contamination by invasive alien species is considered one of the greatest threats to biodiversity worldwide. However, in Brazil the information on this subject are still scarce, especially regarding the occurrence, distribution and influence of alien species on native communities, mainly in protected areas. The objective of this study was to identify exotic plant species present in the intensive use zone of Serra dos ?rg?os National Park and determine their occurrence, distribution and influence on the native plant community. The study area is located in Teres?polis and concentrates on the barragem road, which cuts across the zone of intensive use. To determine the occurrence of exotic plant species were allocated, randomly, 30 plots of 10 x 10 m along the road, located at different distances in edge-interior gradient of forest in order to identify the penetration and distribution of these species in the forest. Individuals with circumference at breast height (cbh) above 8 cm were included in the sample. To characterize plant community, phytosociological parameters were calculated as basal area, density, frequency, dominance and rates of coverage and importance. For the herbaceous layer, sub-plots of 5 x 5 m plots were installed within the existing plots, and those sampled by the method of points. We found 1,274 individuals of shrub-tree layer, distributed in 53 families, and 362 individuals of the herbaceous layer, distributed in 15 families. Only two exotic species were sampled: Impatiens walleriana Hook. f. e Hedychium coronarium J. K?nig, both herbaceous. These species were restricted to plots of class A, with penetration less than 10 meters. Its distribution is aggregated and, in the plots, they were found only in low densities, but with high frequency, suggesting behavior of weeds. The presence of these species have no influence on the tree-shrub layer but in the herbaceous layer, values of richness and abundance showed a negative correlation in the presence of these exotic species.