Influence of Forest Exploration on Populations of Endangered Species in FLONA do Jamari, RO

Abstract

Ordinance n. 443, of December 17, 2014 recognizes 2113 species of Brazilian flora as threatened with extinction and classifies them into four threat categories (extinct in nature, critically endangered, endangered, vulnerable). Conservation units play an important role in maintaining populations of these species. However, these populations can be affected by anthropic influence. In this sense, the present work aimed to evaluate the structural and ecological patterns of these species, post-logging, in the National Forest of Jamari, RO. Twelve plots of 0.5ha were randomly marked in two Units of Annual Production at Forest Management Unit III, where individuals with DBH≥10,0cm were evaluated. With the list of the floristic composition obtained from the sample, the species listed in the book red of endangered species and species of economic importance that have low density were selected for the study, according to the conservation unit management plan. Phytosociological descriptors, mortality rate, ingress, growth, spatial distribution patterns and diametric structure. Six species classified as vulnerable (VU) and one species of economic importance with restricted occurrence. There were no changes in the structure of the species after the exploitation, however it is important to monitor and evaluate the need for the use of silvicultural treatment, especially for species included in the forest management plan.