Keywords
dominance
diversity
importance value
similarity
How to Cite
Abstract
Natural regeneration of three stands harvested with the seed-tree method during the period 1989-1995 was evaluated in order to determine the composition, diversity, floristic similarity and importance value of the tree species. Within each stand, relatively homogenous units were identified taking into account characteristics such as slope, exposure, altitude, and number of seed trees, resulting in eleven units. Adjacent to these units, stands without silvicultural treatment were selected. Inside each unit a 314.16 m2 (10 m radius) circular site was established, each of which was subdivided into four 78.54 m2 sub-plots. Established regeneration of tree species (pines and hardwoods) was evaluated in the stands under management while in stands without management only the tree species were recorded. Species diversity and density were determined, along with the importance value index. Both diversity and similarity indices were also calculated. The results indicate that the stands under study have a mixture of pine and hardwood species, with the pines being relatively dominant. The diversity indices calculated indicate that as time goes on after the regeneration treatment, diversity and richness values are lower, although they do not change in stands without treatment. Species diversity indices among treated stands are all statistically different. However, in comparison with untreated stands, only one stand and the one adjacent to it are not statistically diferent, having the highest similarity index between them. In general, the mix of species in the stands with regeneration treatment and in the adjacent areas undergoes few changes. It was therefore concluded that the regeneration treatment had no negative effects on species composition and diversity, even though it did result in a slight increase in both of these conditions.
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