Tese
Crescimento de espécies florestais madeiráveis como subsídio para o manejo florestal na Amazônia ocidental
Fecha
2013-02-25Registro en:
CUNHA, Thiago Augusto da. GROWTH OF FOREST TIMBER SPECIES AS IMPROVEMENTS TO
THE FOREST MANAGEMENT IN WESTERN AMAZON. 2013. 107 f. Tese (Doutorado em Recursos Florestais e Engenharia Florestal) - Universidade Federal de Santa Maria, Santa Maria, 2013.
Autor
Cunha, Thiago Augusto da
Institución
Resumen
Reliable growth data from trees are very important in the context of forest
management. Tree-characteristics such as architecture and competition are
associated with diameter growth. Previous studies analyzing tree growth changes
have indicated that these variables can describe these effects more effectively.
However, the precise role of these effects in the growth modeling of tropical trees
needs to be studied further to discuss more effectively the actual forest management
practices. Here, we reconstructed the periodic annual basal area increment (IPAg) of
four long-lived timber species from the Amazon forest: Cedro (Cedrela odorata);
Cerejeira (Amburana cearensis); Copaíba (Copaifera paupera) e Mogno (Swietenia
macrophylla) aiming to explain the IPAg variation by developing a individua-tree
growth model using the following potential predictors: tree size, morphometric data,
competition; crown position and liana load. The model was fitted using a Gamma
distribution in the context of Generalized Linear Models. The statistics criteria and
residual distributions showed that growth model was adequate to adjust the observed
IPAg data and revealed some dendrometric variables that were involved into the
effects that lead the observed variation in IPAg, presenting a broad range of the
observed data in situations were growth is complex and variable between species.
Trees sampled in good site conditions - expressed as a good crown exposure to light,
and therefore low competition - presented higher growth rates than trees sampled
under high competition from neighboring trees. Besides, the variables Liana load, for
Cedrela, the crown diameter and the Hegyi competition index was demonstrated to
be highly influential predictive variable. Also, trees sampled in densities greater than
25 m2.ha-1 had their IPAg% significantly reduced. In the context of basal area
increment yield by the space occupied in the forest (crown efficiency) the species
presented mostly efficiency when growth in dominant position with thin and long
crown (crown formal). Among the species, Cedrela odorata was the most efficient in
growth. This behavior reinforces the importance of release trees to obtain better
crown exposure.