Efecto de las zonas de vida y la altura relativa en la densidad anhidra de Swietenia mahagoni Roxb y Swietenia macrophylla Jacq. plantadas en La Sierra, República Dominicana.
Efecto de las zonas de vida y la altura relativa en la densidad anhidra de Swietenia mahagoni Roxb y Swietenia macrophylla Jacq. plantadas en La Sierra, República Dominicana.
-
DOI: https://doi.org/10.22533/at.ed.7172417058
-
Palavras-chave: : maderas tropicales, altura relativa fuste, densitometría convencional, anova repetida mixta, regresión lineal.
-
Keywords: tropical woods, stem wood, conventional densitometry, repeated mixed anova, lineal regression
-
Abstract: This study provides an analysis of factors affecting variation of the anhydrous density property within trees and between the species Swietenia macrophylla Roxb and Swietenia mahogani Jacq., growing in three different life zones in La Sierra region, Dominican Republic. These species are very important for the reforestation programs that are carried out in the study area, although little is known about the difference in their wood characteristics within this region. Our objective was to study the anhydrous density of stem wood from these two species, based on robust statistical methods, and conventional densitometry. A mixed repeated measurement analysis (ANOVA) was employed using species and life zone as inter-subject factors, and relative height as an intra-subject factor. The analysis of variance in terms of the factor effects model was expressed in terms of a regression model that allows the assessment of multifactor analysis when the matrix structure of independent variables is not simple as in this case. Results show that three-way interactions, simple bidirectional, and simple main effects are statistically significant. When compare among species, anhydrous density was higher for S. mahagoni than for S. macrophylla; was lowest in the "dry" life zone; and diminished as relative height within the tree stem increased. Lowest average anhydrous density for S. mahagony and S. macrophylla were, respectively, 0,649 g/cm3 and 6,76 g/cm3, both values observed in the "dry" live zone at 0,8 relative height. The respective corresponding highest averages were 0,951 and 0,876 g/cm3, both observed within the "humid" live zone at RH of 0,1.
- Santiago W. Bueno-López
- Luis Rene Caraballo Rojas
- Juan G. Torres