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Forest structure and floristic composition of the tropical rain forests of the Cordillera de Talamanca, Costa Rica Estructura forestal y patrones florísticos de dos bosques tropicales húmedos de la Cordillera de Talamanca, Costa Rica

by Valverde B, O.
Publisher: 1998ISSN: 0304-3711.Subject(s): BOSQUES | SOTOBOSQUE | COMPOSICION BOTANICA | SINECOLOGIA | CARACTERISTICAS DEL RODAL | COSTA RICA | FORESTS | UNDERGROWTH | BOTANICAL COMPOSITION | SYNECOLOGY | STAND CHARACTERISTICS | COSTA RICA | FORET | SOUS BOIS | COMPOSITION BOTANIQUE | SYNECOLOGIE | CARACTERISTIQUE DU PEUPLEMENT | COSTA RICA In: Brenesia (Costa Rica) (no.49-50) p. 39-60Summary: This study was carried out in April 1997, in the region of Bri-bri, the principal town in the Talamanca region in SE Costa Rica. This region now has around 60 percent forest cover, with Pentaclethra macroloba (gavilan) as the dominant tree species. The study compared the structure and floristic composition of 2 forests (B1 and B2) disturbed by humans; B1 was the most disturbed forest. The horizontal and vertical structures of each forest were determined using a sampling intensity of 3 percent and including all trees with more than or equal to 10 cm dbh (diameter at breast height) in 0.1 ha plots. In both forest, the Fabaceae was the most important family, having the highest dominance and density values. Pentaclethra macroloba was the dominant tree species (12.75Summary: and 21.18Summary: relative dominance in forests B2 and B1, respectively). Hura crepitans, Poulsenia armata and Dussia foxii were the emergent tree species, and Siparuna guianensis the principal understorey species. Forest B1 had the highest percentage of colonizer species and dominance of Pentaclethra, which represented the principal difference between the forests.
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This study was carried out in April 1997, in the region of Bri-bri, the principal town in the Talamanca region in SE Costa Rica. This region now has around 60 percent forest cover, with Pentaclethra macroloba (gavilan) as the dominant tree species. The study compared the structure and floristic composition of 2 forests (B1 and B2) disturbed by humans; B1 was the most disturbed forest. The horizontal and vertical structures of each forest were determined using a sampling intensity of 3 percent and including all trees with more than or equal to 10 cm dbh (diameter at breast height) in 0.1 ha plots. In both forest, the Fabaceae was the most important family, having the highest dominance and density values. Pentaclethra macroloba was the dominant tree species (12.75

and 21.18

relative dominance in forests B2 and B1, respectively). Hura crepitans, Poulsenia armata and Dussia foxii were the emergent tree species, and Siparuna guianensis the principal understorey species. Forest B1 had the highest percentage of colonizer species and dominance of Pentaclethra, which represented the principal difference between the forests.

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