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Source publication
Worldwide, Tectona grandis (teak) is recognized for its productivity and the quality of its wood. The Brazilian market is already seen as a great potential for consumption and production of teak wood. Therefore, the objective of this work was to characterize the teak wood grown in Brazil through a bibliographic survey of the results already availab...
Context in source publication
Context 1
... wood logs wood have a narrow, light sapwood of a yellowish color, quite distinct from the heartwood, whose color is bright and bright brown. The growth rings are clear and differentiated in the cross-sections (Figure 2). Research, Society and Development, v. 10, n. 14, e162101421549, 2021 (CC BY 4.0) | ISSN 2525-3409 | DOI: http://dx.doi.org/10.33448/rsd-v10i14. ...
Citations
... Teak wood from fast-growing plantations has an average density range of 0.50-0.60 g.cm −3 , which varies depending on the growth site and has a tendency to increase with age (Chagas et al. 2014;Berrocal et al. 2020;Lima et al. 2021). In addition, wood density varies within the growth ring and in the radial direction (Gaitan-Alvarez et al. 2019). ...
The high demand for teak wood has driven efforts to achieve increased volumetric production in fast-growing plantations. However, the logs often exhibit higher proportions of sapwood and juvenile wood. This study was conducted to investigate how the age of teak trees in commercial plantations influences the heartwood proportion, wood density, and formation of mature wood. A total of 12 trees of both clonal and seed origins were harvested at the ages of 5, 10, 15, and 20 years old. Disks in the regions of the base, 2.3 m, and top of the trees were collected. Along the stem, we determined the total, heartwood, and pith diameters, as well as the proportions of bark, sapwood, heartwood, and pith. The base disks were used to analyze wood density and to demarcate the transition from juvenile to mature wood stages by X-ray densitometry. As teak wood aged, it exhibited higher heartwood percentages, with variations ranging from 7% (5 years old) to 56% (20 years old). The five-year-old wood had the mean highest density (0.74 g.cm⁻³). There was a trend of increasing mean wood density as the trees aged from ten years. The diameter profiles by X-ray densitometry indicate a higher wood density in the pith-bark direction. The density of 20-year-old wood ranged from 0.54 g.cm⁻³ (ring 1) to 0.78 g.cm⁻³ (ring 19). For all ages evaluated, juvenile wood is predominant, with the transition age occurring at approximately 11 years old. However, only 15- and 20-year-old trees had mature wood in their heartwood, but it was less than 2% of the total heartwood at those ages.
... For example, the teak obtained from plantations in central Brazil has a high proportion of whitish sapwood, as opposed to the dark brown heartwood of larger native teaks exploited from forest remnants in Asia (Carmo et al., 2020;Pereira et al., 2021). Companies have sold whitish teak timber for a lower price but are finding alternative ways to use the timber commercially, considering its particularities (Lima et al., 2021). The regular wood mills that operate using timber exploited from native remnants in the Amazon, as well as those using large logs of eucalypt and pine produced in southern Brazil, may not be adequate to process small native trees coming from restoration plantations. ...
Background
Knowledge of the anatomy and properties of wood help to understand the quality of wood and plan its ideal technological use, therefore, it is necessary to understand the variations in wood characteristics and properties. Here we evaluate the radial variation of wood density and fiber morphology of two commercial forest species in a tropical humid forest of the department of Madre de Dios in Peru: Jacaranda copaia and Hura crepitans collected in a management area.
Results
Forestry collecting 10 usable trees by species. We provide general values of the densities and fibers of the two species studied.
Conclusions
Regarding the variation of the radial density, J. copaia presented a density growth in the pith-bark direction, while for H. crepitans its variation was not significant, these variations are clearly explained by the morphology of its fibers.
Key words:
Tropical wood; wood anatomy; wood quality; X-ray densitometry.
