ESTRUCTURA Y COMPOSICIÓN FLORÍSTICA DE LA SELVA ALTA PERENNIFOLIA EN EL EJIDO NIÑOS HÉROES TENOSIQUE, TABASCO, MÉXICO

Abstract

Floristic composition and forest structure
were described for the tall evergreen
tropical forest of the Ejido Niños Heroes,
Tenosique, Tabasco (NHT). We selected
four sampling units (U), each of which
was set up in a box 50 X 50 m (2 500
m2). In each U all trees with a diameter
at breast height breast (DBH) ≥ 2.5 cm
were counted and measured for height.
Density, frequency, and dominance were
determined to get importance value,
diversity, and similarity indices. A total
of 4 773 individuals, belonging to 112
genera and 196 species, were surveyed
and identified. The most abundant families
were Rubiaceae, Fabaceae, Sapotaceae,
Moraceae, Annonaceae, and Arecaceae.
Three strata were established: lower (1 to
10 m), middle (11 to 20 m), and upper (21
to 30 m). Rinorea guatemalensis was the
species with the highest value importance
(IVI 33.5). The sampling units showed a
similar diversity: U3 (H’) 3.9, U1 3.6, U2
3.4, and U4 3.3. The Sorensen Similarity
Index stated that the units are different in
species composition. U3 and U4 are most
similar to one another. The NHT forest
possesses high abundance, richness, and
diversity of species. Although it has been
subjected to strong degrading changes, it is
still in a state of conservation.