Composição florística e estrutural da regeneração natural em uma floresta manejada no município de Itacoatiara (AM)
The regeneration of vegetation is a natural process in which each species develops its own characteristics. Knowing the process of natural regeneration, when subjected to selective logging is of fundamental importance for the success of forest management. Aiming to analyze natural regeneration af...
| Autor principal: | Carneiro, Vilany Matilla Colares |
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| Grau: | Tese |
| Idioma: | por |
| Publicado em: |
Instituto Nacional de Pesquisas da Amazônia - INPA
2020
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| Assuntos: | |
| Acesso em linha: |
https://repositorio.inpa.gov.br/handle/1/12838 http://lattes.cnpq.br/6276022243327082 |
| Resumo: |
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The regeneration of vegetation is a natural process in which each species develops its own
characteristics. Knowing the process of natural regeneration, when subjected to selective
logging is of fundamental importance for the success of forest management. Aiming to
analyze natural regeneration after such interventions, six plots of 10 x 100 (level 2 = 2.4
ha) were allocated divided into sub plots of 2 x 2 m (level 1 = 0.288 ha) in three areas with
different ages of exploration and a witness in the logged forest of the timber company
Precious Woods Amazon Ltda, located in Itacoatiara (AM). At each level were taken three
size classes, level 1 (C1 = 0.50 m ≥ height < 1.50 m; C2 = 1.50 m ≥ height < 3 m; C3 =
height ≥ 3 m and DBH < 5 cm), level 2 (C1 = 5 cm ≥ DBH < 10 cm; C2 = 10 cm ≥ DBH <
15 cm; C3 = 15 cm ≥ DBH ≤ 20 cm). Plant height was measured with a ruler graduated in
meters and the diameter was measured with a diameter tape, the identification of plants
was made in the field and in the laboratory and much of the plant material was collected,
pressed, dried and identified by comparison with the herbarium material. The floristic
composition consisted with 4365 individuals (level 1 = 2278, level 2 = 2087), 49 families
(level 1 = 44, level 2 = 46), 154 genera (level 1 = 125, level 2 = 126) and 416 species (
level 1 = 341, level 2 = 268). The Shannon diversity index was 5.24 (level 1 = 4.97, level 2
= 4.95) and floristic similarity of 0.38 (38%) with 193 species common to both levels. The
vertical structure of the natural regeneration showed a decrease in the number of
individuals at both levels, according to the amplitude of the class size adopted. The first
class of each level (C1) detained most of the individuals, when compared to the last two
classes. At both levels of approach, the different areas analyzed were dominated by
individuals belonging to family Burseraceae, as to the number of species, the families
differed among the areas examined at the two levels. For the size classes at the two levels
of approach, 35 (8.41%) species covered all size classes. Among those that occurred in all
classes, for both levels, are the species that are exploited by the company: Goupia glabra
Aubl. (cupiúba), Scleronema micranthum (Ducke) Ducke (cardeiro) and Zygia racemosa
(Ducke) Barneby & J.W. Grimes (angelim rajado). Regarding the vertical structure
analyzed for the level one species Duguetia flagellaris Huber (envira amarela) was the
most important in the parameter on natural regeneration. The most important species in the
horizontal structure forest of the for level 2 was Protium sp. 2. (breu vermelho). The forest
is considered non-stocked for the species exploited by the company for level 1, because the
stock index was 18.43% as in the level 2 was considered the forest stocked because the
stock index was 72.50%. |