2024-11-062024-11-062023-08-29SILVA, Taíla Mendes da. Avaliação da regeneração natural de uma pastagem abandonada na região nordeste do Pará. 2023. Trabalho de Conclusão de Curso (Bacharelado em Engenharia Florestal) – Universidade do Estado do Pará, Belém, 2023https://bibliotecadigitaldetcc.uepa.br/handle/riuepa/504Degradation, whether resulting from natural or anthropogenic factors, generally involves severe environmental changes that reduce biodiversity, forest cover, and ecosystem goods and services flows. Depending on the level of degradation in an area, restoration or rehabilitation actions are necessary. This study aims to evaluate the successional evolution and demographic dynamics of shrub and tree species in the natural regeneration of a disturbed and abandoned pasture area. The study was conducted in an abandoned pasture area within the experimental site of the Center for Reference in Sustainable Agricultural and Forestry Technologies "Eurico Pinheiro" at Embrapa Eastern Amazon, located in Terra Alta, Pará, Brazil. Sampling comprised two categories: the first sample category consisted of four replicates (T0 – Quadrat plantings), and the second category consisted of five replicates (L0 - Line plantings). The data were collected from inventories previously conducted in the area. Initially, in March 2019, all woody individuals—climbers, shrubs, and trees—with DBH ≥ 2.0 cm were inventoried in all sampling units. In May 2022, a remeasurement was performed, resulting in a period of 38 months between measurements. Averages of trees per hectare and basal area were calculated to determine absolute dominance. Diameter class distribution, qualitative and quantitative analyses for richness and diversity, explored through the importance value index, Shannon-Wiener index, and floristic similarity comparison using Jaccard and Bray-Curtis indices, were conducted. In the first measurement (2019), 229 individuals of woody species were recorded, while in the second monitoring (2022), 348 individuals were observed, representing a 52% increase in abundance. Regarding biomass accumulation, basal area showed variation from 1.07 to 9.35 m²/ha in 2019 and an increase in basal area per hectare ranging from 1.69 to 15.47 m²/ha in 2022, resulting in a total community increase of 43%. The diameter distribution for 2019 and 2022 indicated that the sampled community had a higher concentration of individuals in the smaller diameter classes. In terms of species richness, the area started with 25 species in 2019 and increased to 37 species (48%) over 38 months. Species such as B. aerugo, L. pubescens, C. arborea, V. guianensis, and T. guianensis accounted for 65.25% of IVI in 2019 and 63.42% in 2022. The diversity index value for the entire community was H’= 2.37 in 2019 and H’= 2.50 in 2022. The Jaccard floristic similarity in the sampled universe was 68%, while the BrayCurtis similarity was 78%. The successional evolution of natural regeneration in the area was confirmed through alterations in the phytosociological parameters of the monitored area. Species like B. aerugo, L. pubescens, C. arborea, V. guianensis, and T. guianensis occupied greater importance in terms of density and basal area. Thus, it is evident that natural regeneration has shown positive results in restoring the study area, suggesting that the utilization of this passive restoration method could be considered a viable option.Língua PortuguesaAbertoPassive restorationEcological successionPhytosociologyTrabalho de Conclusão de Curso (TCC)