Abstract
Permanent plots were studied over 6 years in approximately 64 ha of undisturbed gallery forest alongside the Gama stream in the Federal District, Brazil. Trees from 31 cm girth at breast height (gbh) ( ca. 10 cm diameter at breast height (dbh)) were measured every 3 years from 1985 in 151 (10 m × 20 m) permanent plots. Natural regeneration (individuals under 31 cm gbh) was measured in 1986, 1989 and 1991 in subplots within the 200 m 2 plots. The total tree flora (gbh ≥ 31 cm) consisted of 93 species, 81 genera and 44 families in 1985. Almost all species, present as trees, had seedlings and saplings at some time during the measurement period, but for most species one of these phases was missing on some occasions. Regeneration of about 80% of the species occurred in the establishment phase (poles). The density structure of trees and natural regeneration was similar to each other with more than 80% of the species occurring at low densities. The rate of decrease between successive height classes was around 50%, indicating the typical low level of establishment for juveniles in tropical forests. The species most abundant as trees also had abundant regeneration, apart from few exceptions. Therefore, the Gama community seems to be robust enough to maintain a diversity of species and structure in undisturbed conditions.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call