Resumo

RUIZ-BLANDON, Bayron Alexander; HERNANDEZ-ALVAREZ, Efrén; RODRIGUEZ-MACIAS, Ramón  e  SALCEDO-PEREZ, Eduardo. Mensuration assessment and biomass production in Gmelina arborea Roxb. ex Sm. established in pure and mixed stands. Rev. mex. de cienc. forestales [online]. 2020, vol.11, n.59, pp.94-117.  Epub 15-Jul-2020. ISSN 2007-1132.  https://doi.org/10.29298/rmcf.v11i59.644.

Gmelina arborea (melina) is a forest species highly appreciated for its fast growth, moreover, it is considered multipurpose because of the many uses of wood. The establishment of the species in pure stands (PS) has led to various biomass and mensuration studies; therefore, mixed plantations (PM) have also been established as an alternative in Mexico, although they have been little documented. The aim of the study was to evaluate and compare the total height (H), diameter (DBH), basimetric area (BA), volume (V) and biomass of G. arborea established in 15-year old PP and PM in the state of Nayarit. Within the plantations, three 1 000 m2 plots were established, in which DBH, H, V were measured as well as tree biomass and AB were estimated. Within the sampling units, soil samples were collected. The G. arborea in PM increased in 5.8 cm in DBH, 0.04 m2 in AB, 12.2 % in leaf biomass, 8.8 % in branches, 7.7 % in stem, 10 % in root and 7.6 % in total biomass per tree which was corroborated by ANOVA and Tukey's test. The difference in density between the plantations indicated a higher yield in biomass of the PP (17.9 %). Improved mensuration parameters and biomass production were associated to soils with pH > 6 and C:N ratio > 20. The optimal yield of G. arborea will depend on the forest arrangement, management and soil characteristics.

Palavras-chave : Growth; allometric equations; Gmelina arborea Roxb. ex Sm.; mean annual increase; soil properties; volume.

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