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Ajustamento simultâneo de equações de biomassa de pinheiro manso no sul de Portugal
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Orientador(es)
Resumo(s)
We present a system of alometric biomass equations for aboveground compartments for Pinus pinea L. that allows biomass estimation with information from conventional forest inventories. We harvested 40 trees located in south of Portugal and separated and weighed all the aboveground components: needles, stem bark, branches and stem. The equations were simultaneously fitted using seemingly unrelated regression. This method allows the compatibility of the partial allometric equations with the equation for total biomass aboveground that corresponds to the sum of those 4 equations. The models were better for stem (R2adj.=0.85) and bark (R2adj.=0.83) and worst for branches (R2adj.=0.79) and needles(R2adj.=0.71). Crown biomass was always high compared with aboveground biomass, independently on stand characteristics. However it may be exacerbated by artificial pruning that is carried out to increase crown expansion for pine nut production. The different stand management circumstances from where trees harvested were selected may explain the worst fitting for crown components.
Descrição
Palavras-chave
pinus pinea biomass allometric models modelo alometrico biomassa pinheiro manso
Contexto Educativo
Citação
Correia, A. C., Faias, S., Tomé, M., Evangelista, M., Freire, J., Ochoa, P. (2008) Ajustamento simultâneo de equações de biomassa de pinheiro manso no sul de Portugal Silva Lusitana Vol 16(2): 197-207