Resumo

RUIZ-AQUINO, Faustino et al. Aerial biomass equations for Quercus laurina and Q. crassifolia in Oaxaca. Madera bosques [online]. 2014, vol.20, n.2, pp.33-48. ISSN 2448-7597.

Estimating tree biomass is a means to determine the existing amounts of organic carbon in each of the tree components. Studies of biomass for Quercus species are scarce in Mexico, even though the country is considered a distribution center. The aim of this study was to generate allometric equations for estimating aboveground biomass of trees Quercus laurina Humb. & Bonpl. and Q crassifolia Humb. & Bonpl., in a forest community of Ixtlán de Juárez, Oaxaca, México. Sixteen trees were sampled per species, distributed in six diameter categories and biomass was determined in stem bark, branches and foliage. Different regression models were evaluated based on fitness and validity of their statistical indicators. An exponential equation was chosen in the form of Biomasa = e^{[-βo+β1 ln(DN2xAT)]}, to calculate the biomass (kg) within a normal diameter (DN, cm) and total height (AT, m) of the trees. The total aboveground biomass was estimated at 100,15 Mg ha^-1 for Q. laurina and 129,97 Mg ha^-1 for Q. crassifolia. The proportional distribution of biomass per component of Q. laurina was 82,9%; 14,9% and 2,2% for stems, branches and foliage, respectively, while for Q. crassifolia the distribution was 82,3%; 16,0% and 1,7% in the same order.

Palavras-chave : diametric categories; normal diameter; foliage; stem; branches.

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