Diameter structure of a tropical mixed forest fragment in middle stage of regeneration colonized by the invasive species ligustrum lucidum W.T. Aiton.
The Atlantic Forest biome consists of a number of distinct forest typologies, including the Tropical Mixed Forest (TMF). It is commonly found in small areas and different stages of regeneration, which favors the presence of invasive species, such as Ligustrum lucidum W. T. Aiton. The hypothesis proposed in this study was that the diameter distribution may be decreasing or unimodal for the forest and the species under study. Therefore, this work aimed to evaluate the diameter structure of both the forest community and the species Ligustrum lucidum. For the study were installed three rectangular sample units of 300 m3 in which all individuals with a diameter at breast height (DBH) above 10 cm were measured. For both the forest and the species in question, probabilistic functions (fdps) were adjusted, with the number of classes defined by Sturges methodology to evaluate their behavior, and their adjustments were evaluated through the Kolmogorov-Smirnov test. The results indicate that all the functions showed adherence (α=5%) for real data, both for the forest and for the species Ligustrum lucidum. However, when considering the adjustment weighting of the forest and the species Ligustrum lucidum, the Wakeby function showed the best goodness of fit in the total ranking. The diameter structure demonstrates the early stage of regeneration of the forest fragment under study. The forest and the species Ligustrum lucidum have negative exponential distribution in an inverted "J" shape. The curve of the species Ligustrum lucidum is flatter than the curve of the forest.