Physical Properties of Juvenile Wood of Two Paulownia Hybrids

Abstract

There is a growing trend in the world of planting fast growing species (rotations 5 to 10 years). Their primary purpose is the production of wood fibers and biomass, but they certainly represent the potential in making solid wood products as well. One of the fast-growing species is Paulownia sp., a species of extremely fast growing wood. Plantation breeding of Paulownia sp. in Croatia is increasing, although there is a little knowledge about the technical properties of Paulownia wood and its end use is questionable. This paper presents preliminary results of some physical properties of juvenile wood of two Paulownia hybrids planted in the area near the town of Glina in the Republic of Croatia. One hybrid is 9501 ((Paulownia fortunei × Paulownia elongata) × (Paulownia fortunei × Paulownia tomentosa)) and the other hybrid is Shan Tong (Paulownia fortunei × Paulownia tomentosa). The aim of this study was to investigate physical properties of juvenile wood of two Paulownia hybrids from one site in Croatia, to determine differences in physical properties of wood between two hybrids and to evaluate the correlation between density and shrinkages of each hybrid. Significant differences in oven dry density, basic density and density at maximum MC, between the two hybrids were determined. There is no statistically significant difference in longitudinal, radial, tangential and volumetric shrinkages between the two hybrids.

Radial Variability of Selected Physical and Mechanical Parameters of Juvenile Paulownia Wood from Extensive Cultivation in Central Europe—Case Study

“…The juvenile nature of the wood is indicated by the low results of the parameters obtained including density, which ranged from 193 to 229 kg/m 3 . Similar results for juvenile wood of Shan Tong paulownia were reported by Sedlar et al [ 18 ]. Here, a density of 220–233 kg/m 3 was obtained for a 4-year-old plantation established in the Republic of Croatia.…”

“…As a result, Paulownia hybrids were developed and eventually became the most widespread and successful forms of the species for commercial production. The most known hybrids are ‘Clon in vitro 112′ [ 9 , 16 ], ‘Cotevisa 2′, ‘Sundsu 11′ [ 17 ], and ‘Shan Tong’ [ 18 , 19 ]. In Poland, the most commonly described hybrids are Clon in vitro 112 and Shan Tong [ 10 ].…”

Quality characteristics of the selected variant of Paulownia tomentosa (Robust4) wood cultivated in Hungary

“…The density of Paulownia tomentosa Robust4, i.e. 273 kg/m 3 is -similarly to that of other paulownia variants (Senelwa and Sims 1999, Flynn and Holder 2001, Minato et al 2005, Kalaycioglu et al 2005, Akyildiz and Kol 2010, Kiaei 2013, Hassankhani et al 2015, Sedlar et al 2020 is very low (Table 1). Its air dry density, an important parameter for industrial use, indicates that the Paulownia tomentosa Robust4 is one of the lightest woods of the world.…”

Propriedades físicas e mecânicas da madeira de Paulownia fortunei (Seem.) Hemsl. var. Mikado crescendo no Sul do Brasil

“…Dentre eles destacam-se os estudos realizados com árvores de P. fortunei crescendo no Irã e na Croácia, que demonstraram que a madeira possui densidade básica baixa, em torno de 0,240 g/cm³, boa estabilidade dimensional e baixa resistência mecânica (Kiaei, 2013;Sedlar et al, 2020). Outra pesquisa avaliou o híbrido de P. elongata x P. fortunei em crescimento na Espanha, que apresentou também baixos valores de densidade básica e variação entre a madeira juvenil e adulta (Fos et al, 2023).…”