Abstract
This study was conducted in one region of a Seasonal Semideciduous Forest located in Tapurah (Mato Grosso State, Brazil) with the aim of studying its floristic and structural composition. The fixed area method was applied to 10 × 250 m clusters, allocating and measuring five clusters with five subunits of 500 m² each. Species with a diameter at breast height greater than or equal to 10 cm were considered, and the sample sufficiency of the floristic survey was verified by a species accumulation curve. The similarities between the sample subunits were calculated by the Jaccard Similarity Index, and the species diversity with the Shannon Diversity Index and Pielou Evenness Index. The horizontal vegetation structure was characterized by density, frequency, dominance and the values of ecological importance, and diametric distribution were assessed by the Spiegel procedure. The families Vochysiaceae, Fabaceae and Sapindaceae were highly represented, and Qualea paraensis , Aspidosperma discolor and Matayba arborescens were the most important species. A high diversity and low ecological dominance were found, and the diametric structure of the trees presented a negative exponential distribution. In general, the structure, floristic composition and richness of vegetation correspond to a forest with stable and autoregenerative community after selective logging.
Highlights
Anthropogenic pressures on native vegetation and the lack of relevant studies could compromise the conservation of forest remnants and endanger their species richness
The aim of this study was to explore the floristic and structural composition of a fragment of Seasonal Semideciduous Forest submitted to selective logging in order to evaluate the richness, diversity and condition of the area
A floristic and structural survey on a fragment with an area of 32.98 ha was conducted in the municipality of Tapurah, Mato Grosso State, Brazil (12°28'5.67"S; 56°33'32.14"W)
Summary
Anthropogenic pressures on native vegetation and the lack of relevant studies could compromise the conservation of forest remnants and endanger their species richness These remnants play an important role as ecological corridors that are able to provide gene flow between isolated populations, a critical factor for the conservation of many species (Silva & Tabarelli, 2000). Structural data comparisons are essential to assess the loss of biodiversity and the vulnerability of plant communities in fragmented areas and to evaluate potential losses and conserve natural resources in the long term (Corsini, Scolforo, Oliveira, Mello, & Machado, 2014). Conservation initiatives, management and restoration of forest fragments require detailed studies on the inventories of flora and the ecology of plant communities (Pinto et al, 2007)
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