Phytosociology of the shrub-arboreal stratum of the Ibura National Forest, Northeastern Brazil: are 35 years sufficient to promote the regeneration of a forest fragment?

Abstract

Phytosociology of the shrub-arboreal stratum of the Ibura National Forest, Northeastern Brazil: are 35 years sufficient to promote the regeneration of a forest fragment? Fitossociologia do estrato arbustivo-arbóreo da Floresta Nacional do Ibura, Nordeste do Brasil: 35 anos são suficientes para promover a regeneração de um fragmento florestal? Citation: Santana JP, Rocha PA, Oliveira EVS, Prata APN, Ribeiro AS (2020) Phytosociology of the shrub-arboreal stratum of the Ibura National Forest, Northeastern Brazil: are 35 years sufficient to promote the regeneration of a forest fragment? Neotropical Biology and Conservation 15(2): AbstractAmong the various applications of phytosociology, the evaluation of natural regeneration is of great importance, mainly because it provides insights for ecological restoration. The objective of this study was to analyze the composition and phytosociological parameters of shrub and tree vegetation in areas Neotropical Biology and Conservation 15(2): 89-106 (2020) of plantation of eucalyptus (Corymbia citriodora) and areas of native forest in the Ibura National Forest, located in the Sergipe state of northeastern Brazil. For this purpose, 20 plots were sampled and all individuals with a diameter at breast height (DBH) ≥ 8 cm were measured. Sampling revealed 821 individuals in the forest area and 1,000 in the eucalyptus area. These individuals represent 84 species and the areas presented a significant difference in species composition, with 61 in the eucalyptus area and 65 in the Forest area, and only 40 species were common to both areas. There was a predominance of pioneer individuals in the eucalyptus area. There also was a significant difference in basal area, relative density and relative dominance, but no significant differences were observed in average height. It was concluded that a period of 35 years is insufficient for the recovery of the eucalyptus area, which remains in a more initial successional stage than the forest area. ResumoEntre as várias aplicações da fitossociologia, a avaliação da regeneração natural possui grande importância, principalmente porque fornece subsídios para restauração ecológica. Diante disso, este trabalho foi realizado com o objetivo de analisar a composição e os parâmetros fitossociológicos da vegetação arbustivo-arbórea em áreas de plantio de eucalipto (Corymbia citriodora) e de mata nativa na Floresta Nacional do Ibura, no estado de Sergipe. Para esta finalidade, foram demarcadas 20 parcelas e amostrados todos os indivíduos com diâmetro à altura do peito (DAP) ≥ 8 cm. A amostragem revelou 821 indivíduos na área de mata e 1.000 para a área de eucalipto. Esses indivíduos representam 84 espécies e as áreas apresentaram diferença significativa na composição de espécies, sendo 61 na área de eucalipto e 65 na área de floresta, e apenas 40 comuns a ambas as áreas. Observamos o predomínio de indivíduos de espécies pioneiras na área de eucalipto. Também encontramos diferença significativa para a área basal, densidade relativa e dominância relativa, mas...

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