Florística, Diversidade E Distribuição Espacial Das Espécies Árboreas De Um Trecho De Floresta Estacional Semidecidual Da Serra Da Concórdia, Rj

Abstract

ResumoO estudo foi realizado na borda de um fragmento de Floresta Estacional Semidecidual na Serra da Concórdia, Vale do Paraíba do Sul (RJ). Foram instaladas amostras em dois sítios, cada uma com 10 subparcelas de 100m2, totalizando 0,2 ha. Foi coletado o material botânico das árvores com Diâmetro à Altura do Peito (DAP) maior ou igual a 5,0 cm. Foram amostrados 247 indivíduos, pertencentes a 43 espécies e 23 famílias. A síndrome de dispersão zoocórica, com 51,8% dos indivíduos e 48,8% das espécies e o grupo ecológico das pioneiras, com 33,3% dos indivíduos e 29,7% das espécies, foram os que apresentaram maior ocorrência. Foram analisados os índices de diversidade de Shannon (H’) e de Pielou (J), além do padrão de distribuição das espécies, através do índice de Morisita (Id). Os valores para os dois primeiros índices foram, respectivamente, 3,15 e 0,84. O padrão de distribuição espacial das espécies revelou que 34,1% das espécies apresentaram padrão de dispersão agregado, 29,5% uniforme e 6,8 % aleatório. A Serra da Concórdia é considerada um importante remanescente da Mata Atlântica do médio Paraíba do Sul, o que reforça a adoção de medidas de conservação desse grande repositório da biodiversidade regional.Palavras-chave: Ecologia florestal; floresta de encosta; índice de Morisita; Mata Atlântica. AbstractFloristic, diversity and spatial distributions of tree species in a Semideciduous Forest site in Sierra of Concórdia, RJ, Brazil. This research was conducted at the edge of a fragment of semideciduous forest in Serra da Concórdia, Valley of Paraíba do Sul ( RJ ). Samplings were installed in two sites, with 10 parcels of 100m2 each, totaling 0.2 ha. The botanical material was collected from trees with diameter at breast height (DBH) greater than or equal to 5.0 cm. The results revealed 247 trees belonging to 43 species and 23 families. The number of trees and of species were higher for dispersion syndrome of zoochory (51.8% of trees and 48.8 % of the species) and for ecological group of pioneers (33.3 % of subjects and 29.7 % of the species). The diversity index of Shannon (H'), of Pielou (J), and the distribution pattern of the species by the Morisita index (Id) were analyzed. The values for the first two indexes were respectively 3.15 and 0.84. The spatial distribution of the species revealed that 34.1 % had aggregated dispersion pattern, 29.5% uniform distribution, and 6.8 % presented random distribution. The forest of the Serra da Concórdia is considered an important remnant of the Atlantic Forest in the middle Paraíba do Sul, which reinforces the adoption of conservation measures for that great repository of regional biodiversity.Keywords: Forest ecology; slope forest; Morisita index; Atlantic Forest.

Invasion impact of Artocarpus heterophyllus LAM. (Moraceae) at the edge of an atlantic forest fragment in the city of Rio de Janeiro, Brazil

“…As reported by Freitas and Magalhães (2014), forest fragmentation can cause changes in the microclimate, increasing the risk of fires that favors tree mortality in a range of up to 100 meters from the edge of a forest fragment, increasing edge effects with direct influence on species diversity. According to Levine (2000), diversity loss reduces a community resistance to biological invasion processes.…”

“…Freitas and Magalhães (2014) deemed three main scales: macro (biogeographical), meso (communities), and micro (individuals within a community). In this study, the microscale was taken into account, which was restricted to the understanding of the edge of the forest fragment invaded by A. heterophyllus.…”

Caracterização florística e fitossociológica em uma unidade de conservação, no município de Belém, Pará

“…O sucesso da família Fabaceae é atribuído segundo Freitas et al (2014) as suas estratégias de defesa…”

Floristic, Diversity and Spatial Distribution of Tree Species in a Dry Forest in Southern Brazil

“…The species are organized in different patterns of distribution, as follows: clumped, uniform or random, affected by the influence of abiotic, biotic or even random factors (Matteucci and Colma, 1982;Townsend et al, 2010;Freitas and Magalhães, 2014). The distribution pattern of tree species is a useful tool for the management strategy and / or conservation of a forest population or community (Freitas and Magalhães, 2014).…”

“…The distribution pattern of tree species is a useful tool for the management strategy and / or conservation of a forest population or community (Freitas and Magalhães, 2014).…”