Resumen

ARAUJO-MURAKAMI, Alejandro et al. Diversity, structure and floristic composition of the terra firme and várzea foreste in western Pando, Bolivia. Ecología en Bolivia [online]. 2021, vol.56, n.2, pp.78-90. ISSN 1605-2528.

We analyzed the diversity, structure and floristic composition of two types of Amazonian forests in western Pando. Six plots of one hectare (100 x 100 m) were installed, three in térra firme forest and three in várzea forest, where individuáis of trees and lianas with DBH≥10 cm were evaluated. In total, 3,425 tree stems were recorded, of 380 species (740 according to Chao 2), 187 genera and 53 families. The lianas registered 103 stems, an average of 18 individuals ha^-1 on the terra firme and 17 in várzea. The arboreal diversity of species (f = 0.950; p <0.385) and Shannon-Wiener diversity Índex (f = 0.013; p <0.914) do not present statistically significant differences: in the várzea to record 117 ± 11 species ha^-1 and one Shannon-Wiener index of 3.81 ± 0.25; and on terra firme, 104 ± 7 species ha^-1 and a Shannon-Wiener index of 3.78 ± 0.16 were recorded. The structure presented significant differences in number of individuals (f = 106.602; p <0.000) and maximum diameter of the trees (f = 10.986; p <0.030), being that the várzea registered 657 ± 1.86 trees ha^-1 compared to 485 ±16.5 trees ha^-1 on terra firme. Beta diversity expresses that forests are floristically different: the similarity index (Sørensen) is 32.6 and a quantitative similarity (Bray-Curtis) is 15.36%. In várzea, the most important species were Attalea phalerata, Socratea exorrhiza, Virola pavonis and Theobroma cacao; and on terra firme, they were Tetragastris altissima, Pseudolmedia laevis, Bertholletia excelsa and Cecropia sciadophylla. Both forests harbor a relatively similar diversity, but differ significantly in their structure and floristic composition.

Palabras clave : Amazon; Diversity; Floristics; Forest; Structure.

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