Resumo

MARTINEZ ANGEL, Luis et al. Expansion factors and system partition of aerial biomass for Pinus chiapensis (Martínez) Andresen. Rev. mex. de cienc. forestales [online]. 2019, vol.10, n.51, pp.107-132. ISSN 2007-1132.  https://doi.org/10.29298/rmcf.v10i51.311.

In the present study, expansion factors for constant and variable biomass were developed, as well as an aerial biomass partition system in commercial forest plantations of Pinus chiapensis. By means of a destructive sampling of 35 trees, the fresh weight of stems, branches and foliage in the field was obtained and samples were taken to determine their dry weight. The ratio of the dry and fresh weight was used to convert the green weight into biomass. The aerial biomass was estimated from a direct proportion of the total volume of the stem multiplied by a constant biomass expansion factor. The variable biomass expansion factor was determined based on the quotient of the total aerial biomass model and the total volume of the stem. The aerial biomass partition system was fitted as a direct function of the biomass and a partition factor, which defines the proportion of the biomass by components. The value of the constant biomass expansion factor revealed that for each cubic meter there are 709 kg of biomass. The system of aerial biomass partition indicated a greater biomass distribution in the stem with 69 %, of branches with 21 % and of foliage with 10 %. The application of the biomass expansion factors and the aerial biomass partition system allow us to calculate the total aerial biomass and by components from the total stem volume of the trees measured in the forest inventories.

Palavras-chave : Forest biomass; structural components; allometric equations; Pinus chiapensis (Martínez) Andresen; forest plantations; total stem volume.

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