<b>Composition and structure of the gallery forest in the Taquaruçu GrandeSub-basin, Municipality of Palmas, Tocantins State

Abstract

ABSTRACT. In the State of Tocantins, there is an abundance of water bodies, and consequently a large range of gallery forests. Despite growing awareness of the importance of these forest resources and the need to conserve them, little is known about the composition and floristic diversity of existing remnants, which still represent part of the original vegetation. The aim of this study was to review and compare the floristic composition and structure of the tree layer of the gallery forest in two microbasins of Taquaruçu Grande Sub-basin, Palmas County, Tocantins State. For phytosociological sampling, contiguous 50 plots of 10 x 10 m were set in each area, where all the individuals with trunk circumference greater than or equal to 15, at 130 cm from the ground were sampled. To calculate the phytosociological parameters, was used Fitopac 1 software, and for the similarity calculation, was used Similarity Score of Sörensen. 928 individuals were recorded, totaling 139 tree species belonging to 45 botanical families for Area 1 and 2. Species richness for the two areas studied showed no differences, and the Shannon diversity index (H') that 3.751 and 3.671, showing that the species distribution was uniform A1 (J = 0.83) and A2 (P = 0.822). The similarity index between areas was 42%, a result considered low.Keywords: tree layer, watershed, similarity.Composição florística e estrutura fitossociológica de dois trechos de Mata de Galeria na Sub-Bacia do Taquaruçu Grande, Município de Palmas, Estado de Tocantins RESUMO. Apesar da importância desses recursos florestais e da necessidade de conservá-los, pouco se sabe sobre a composição e diversidade florística dos remanescentes existentes. O objetivo desse estudo foi analisar e comparar a composição florística e estrutural do estrato arbóreo da mata galeria em duas microbacias da sub-bacia do ribeirão Taquaruçu Grande, município de Palmas, Tocantins. Para o levantamento fitossociológico, foram alocadas 50 parcelas contíguas de 10 x 10 m em cada área, na qual todos os indivíduos com circunferência de tronco maior ou igual a 15 a 130 cm do solo foram amostrados. Para o cálculo dos parâmetros fitossociológicos foi utilizado o programa Fitopac 1, e para o cálculo da similaridade foi usado o Índice de Similaridade de Sörensen. Foram registrados 928 indivíduos, totalizando 139 espécies arbóreas pertencentes a 45 famílias botânicas para as áreas 1 e 2. A riqueza de espécies para as duas áreas não mostrou diferenças expressivas, assim como o índice de diversidade de Shannon (H') com 3,751 e 3,671, mostrando também que a distribuição das espécies foi uniforme A1 (J = 0,83) e A2 (J = 0,822). O índice de similaridade entre as áreas foi 42%, resultado considerado baixo.Palavras-chave: estrato arbóreo, microbacia, similaridade.

Different substrates and protected environments for the initial development of Richeria grandis Vahl seedlings

“…The natural occurrence of R. grandis is more frequent in the interior of Gallery Forests, often composing the canopy of these woods, close to the watercourse (Silva et al, 2016), confirming its adaptability to intermediate light conditions. Thus, R. grandis seedlings introduced in areas simulating a glade reveal aspects indicative of possible success in their establishments.…”

Phorid fly parasitism rates vary between individual colonies of the leaf‐cutting ant Atta laevigata

“…The temperature of the region is isothermal, with the difference between the average temperatures during the hottest month and that of the coldest month being less than 5°C (INMET 2015). Palmas is located in a region with an abundance of water bodies with a predominant “Cerrado stricto sensu” vegetation type, that has characteristics of open savanna, with patches of a large range of gallery forests, currently under pressure imposed by intensive human activities (Silva et al, 2016). The vegetation of this biome undergoes modifications throughout the year due to climatic changes that occur during seasons, with desert characteristics in the dry period and rapid vegetative growth processes in the rainy season (Ferreira, 2005).…”

Avaliação do potencial toxicológico de bacabas-de-leque (Oenocarpus distichus Mart.) por ensaios de fragilidade osmótica eritrocitária, Artemia salina e em raiz de Allium cepa.

“…A espécie Oenocarpus distichus Mart. (bacaba-de-leque) ocorre tanto na Amazônia, como pode ocorrer nas regiões Centro-Oeste e Nordeste, crescendo em áreas de solo arenoso com frequência na região do Taquaruçu-Grande, Tocantins (LLERAS, GIACOMETTI, CORADIN, 1983;SILVA, LOLIS, VIANA, 2016).…”