Resumen

LEYTHON, Sirli  y  RUIZ ZAPATA, Thirza. Caracterización florística y estructural de un bosque estacional en el sector la Trilla, Parque Nacional  Henri Pittier, Estado Aragua, Venezuela. Acta Bot. Venez. [online]. 2006, vol.29, n.2, pp.303-314. ISSN 0084-5906.

ABSTRACT With the purpose of characterizing the floristic composition and the structure of a seasonal forest of the Henri Pittier National Park, three plots of 0.1 ha were established, among 200 and 400 m asl. The physiognomy and vertical structure was determined qualita-tively by means of vegetation profiles. Plot I was the most diverse (49 species) followed by plot II with 47 species and III with 34 species. The highest floristic similarity was observed (0,44) among plots I and II. Three tree strata were observed: upper, of emergent trees among 13-16 m; mean (canopy), of 8-11 m; and lower, of 4-6 m; also a thin understory. Among the most important species Memora cladotricha, Aphelandra fasciculata, Bauhinia cumanen-sis, Machaerium robiniifolium, Bursera simaruba, Maclura tinctoria and Cochlospermum vitifolium clearly stand out. A list of families and species for each plot and profiles of vegetation that represent the stratification of the forest is presented.

Palabras clave : Aragua state; Floristic composition; Parque Nacional Henri Pittier; Seasonal forest; Structure; Venezuela.