Resumen

MIGUEL-MARTINEZ, Anaberta et al. Expansión factors aboveground biomass for Pinus ayacahuite of the north of Oaxaca. Rev. Mex. Cienc. Agríc [online]. 2016, vol.7, n.7, pp.1575-1584. ISSN 2007-0934.

The biomass is an important and difficult determining factor in forest species, biomass expansion factors (FEB) allow their inventory estimation using variables to infer the biomass and carbon stocks. The objective was to determine FEB variables for aboveground biomass of Pinus ayacahuite using easily measured variables in natural stands of Ixtlan, Oaxaca. In 2013 destructive sampling was held of 30 trees selected in proportion to the relative frequency of diameter class. The biomass was separated into leaves, branches and wood+bark; the volume and biomass were estimated by allometric fimctions. The volume linear model had the best coefficient of determination (0.99). The compartmental biomass was estimated with nonlinear models, presenting pseudo-R2 of 0.91, 0.91 and 0.97 for leaves, twigs and bole+bark, respectively; the total aboveground biomass was estimated normal diameter (DN) and total height (AT) (psedo-R2= 0.97). The partition of aboveground biomass is distributed 5, 14 and 81% in leaves, branches and bole+bark, respectively. The FEB presented an average value of470.9 kg for a tree with average dimensions of DN= 17.9 cm and AT= 16.2 m.

Palabras llave : Pinus ayacahuite; allometric function; biomass partition; destructive sampling.

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