Resumo

TAMARIT-URIAS, Juan Carlos et al. Additive equations systems for inventories of the green weight of Brahea dulcis (Kunth) Mart. aboveground biomass. Rev. mex. de cienc. forestales [online]. 2025, vol.16, n.91, pp.46-69.  Epub 29-Set-2025. ISSN 2007-1132.  https://doi.org/10.29298/rmcf.v16i91.1548.

The immature, folded leaf (spear) of the palm tree (Brahea dulcis) is an important non-timber forest product (NTFP) used by indigenous communities in the semi-arid regions of Puebla, Mexico. However, there is a lack of biometric tools to quantify the green weight of its biomass. Additive equations systems (AES) were developed to estimate the green weight of aboveground biomass by structural component and the total green weight of B. dulcis mature individual specimens. 42 specimens were collected using destructive sampling; for each standing individual, the stem diameter (D; cm) was measured at a height of 20 cm above the ground; the total height (TH; m) and the crown diameter (CD; m) were also measured. The specimens were subsequently felled and separated into components (stem, petioles, green leaves, and spear), and their respective green weights (SW, PW, GLW, and SpW; kg) were recorded. The total green weight (TGW) per individual was obtained by adding the weights of its components. Four AES were evaluated, using as a base model the potential allometric function Y=(·Х β ; the fit was performed using the generalized method of moments. For the best AES selected (R 2 adj =0.6919 and RMSE=0.8793 kg for TGW), the predictor variables were the combination of TH∙CD, both of which are easy to measure. This AES will enable spear inventories to be carried out in compliance with the Mexican official regulations; furthermore, it is the first palm taxon, an important NTFP, to be documented in a semi-arid zone in specialized scientific literature.

Palavras-chave : Crown diameter; allometric models; sugar palm; spear weight; non-timber forest product; additivity property.

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