Alometria, volumetria e densidade da madeira de Goupia glabra Aubl. (Goupiaceae) em duas áreas de floresta de terra-firme na Amazônia
In tropical forests, several studies have shown interspecific differences in allometry and wood density. However, allometric and mechanical variations within the same species growing in different environmental conditions need to be further evaluated. This study aimed to compare the allometry and woo...
| Autor principal: | Siliprandi, Natson de Castro |
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| Grau: | Dissertação |
| Idioma: | por |
| Publicado em: |
Instituto Nacional de Pesquisas da Amazônia - INPA
2020
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| Acesso em linha: |
https://repositorio.inpa.gov.br/handle/1/5013 http://lattes.cnpq.br/7055998706171195 |
| Resumo: |
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In tropical forests, several studies have shown interspecific differences in allometry and wood density. However, allometric and mechanical variations within the same species growing in different environmental conditions need to be further evaluated. This study aimed to compare the allometry and wood density of Goupia glabra Aubl. (Goupiaceae) in two different sites of terra firme Amazonia forest with different environmental features. The two sites are located in two municipalities, Apuí and Nova Olinda do Norte (NOlinda), and both located in the Amazonas State, Brazil, and are nearly 400 km apart. A total of 65 trees ≥ 10 cm DBH, 29 in Apuí and 36 trees in NOlinda, were sampled. For each tree, DBH, total (Ht) and stem (Hf) height, canopy height (Ch) and diameter (Cd), stem volume (Vc), tapper factor of the bole (FF), and wood density at different positions of the stem were recorded. Except the relationship DAP versus Ht, the allometry of G. glabra differed significantly between sites for all allometric relationships. Trees in NOlinda had higher initial growth than trees in Apuí. On the other hand, the relationships between Ch and Cd with DAP and Ht showed an opposite pattern, wherein trees in NOLinda had significantly greater expansion of the canopy compared to Apuí. The ANOVA detected a significant difference in wood density between sites. The average wood density in Apuí was 8.8% lower than in NOlinda. In both sites there was a significant reduction in the wood density from the bottom to the top of the bole, but no interaction between site and position was detected. The findings of this study highlight the variation in adaptive strategy of G. glabra due to environmental variability between sites. This is probably due to differences in canopy-understory light gradient, which result in the differentiation of resource allocation for the vertical and horizontal growth, which, in turn, implies the mechanical support related to wood density. Furthermore, difference in soil fertility and disturbance regimes between sites may act concomitantly with light intensity. |