Abstract
This study aims to understand the effect of the initial planting density on the anatomical variability and basic wood density of Schizolobium parahyba var. amazonicum in a planted forest in Amazonia. The effect of the initial planting density on the radial variation from pith to bark of anatomy and basic density was evaluated. There were two planting densities, planting density-I (624 trees ha-1) and planting density-II (312 trees ha-1). Planting density significantly affected only the ray height, fiber length and wall thickness. Radial position was not significant to the height of the rays and the fiber lumen diameter. The interaction planting density à radial position was only significant for the length of the vessel elements, ray frequency and fiber length. The results indicate that the initial planting density influences the radial behavior of certain anatomical characteristics. To obtain gain in terms of total wood per cultivated area, without harm to the density of the produced wood, planting density-I would be most useful, while planting density-II would be suitable for the production of more homogeneous wood, which tends to form adult wood in advance and with some anatomical characteristics appropriate for the plywood industry.
Highlights
Schizolobium parahyba var. amazonicum, a variation of the species Schizolobium parahyba (Vell.) Blake, of the Fabaceae family, is mainly native to the Amazon, occurring in the states of Northern Brazil (Barneby 1996, Lewis 2015) where it is known as “paricá” and has excelled in homogeneous plantations intended primarily to supply the wood panel industry (Alvino et al 2005).Despite the few studies related to forestry and breeding, S. parahyba var. amazonicum has shown satisfactory silvicultural performance in Brazil, as it presents rapid growth and diameter increase
The choice of the initial planting density, which reflects the spacing adopted among trees, can influence various wood properties (Weber and Sotelo Montes 2010, Naji et al 2014), influence the radial variation of the wood anatomical structure, the tree growth rate and have an effect on the quality of the timber produced for the production of panels, in the case of paricá wood
This study demonstrated that the height of the rays and wall fiber length and thickness exhibit significant variation in function of the initial planting density adopted
Summary
Schizolobium parahyba var. amazonicum, a variation of the species Schizolobium parahyba (Vell.) Blake, of the Fabaceae family, is mainly native to the Amazon, occurring in the states of Northern Brazil (Barneby 1996, Lewis 2015) where it is known as “paricá” and has excelled in homogeneous plantations intended primarily to supply the wood panel industry (Alvino et al 2005).Despite the few studies related to forestry and breeding, S. parahyba var. amazonicum has shown satisfactory silvicultural performance in Brazil, as it presents rapid growth and diameter increase. Amazonicum, a variation of the species Schizolobium parahyba (Vell.) Blake, of the Fabaceae family, is mainly native to the Amazon, occurring in the states of Northern Brazil (Barneby 1996, Lewis 2015) where it is known as “paricá” and has excelled in homogeneous plantations intended primarily to supply the wood panel industry (Alvino et al 2005). The choice of the initial planting density, which reflects the spacing adopted among trees, can influence various wood properties (Weber and Sotelo Montes 2010, Naji et al 2014), influence the radial variation of the wood anatomical structure, the tree growth rate and have an effect on the quality of the timber produced for the production of panels, in the case of paricá wood
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