This study investigates the basic density variation of Paulownia tomentosa wood along both radial and axial directions, using samples from a plantation in northeastern Greece. Two 5-year-old trees were felled, and wood discs were extracted at various heights. Basic density was calculated for small wood cubes, revealing variability within the trees. Results showed that the radial density decreased from the pith to the bark, ranging from 0.350 to 0.220 g·cm−3. This pattern is attributed to the semi-ring-porous structure of the wood and cambial activity. Axially, density increased from the trunk base to the crown base, with values ranging from 0.248 to 0.428 g·cm−3. This axial variation aligns with physiological processes and reduced water availability in upper sections of the trunk. The average basic density of 0.334 g·cm−3 categorises P. tomentosa as a lightweight wood, suitable for applications requiring low mechanical strength. The findings highlight the species’ suitability for fast-growing plantations due to its density stability and ease of processing. This research contributes to understanding P. tomentosa's wood properties, supporting its use in biomass and lightweight applications.
ChaveJMuller-LandauHCBakerTR, et al.Regional and phylogenetic variation of wood density across 2456 neotropical tree species. Ecol Appl2006; 16: 2356–2367.
2.
CrousJWMorrisARScholesMC. Effect of phosphorus and potassium fertiliser on stem form, basic wood density and stem nutrient content of Pinus patula at various stem heights. Aust For2009; 72: 99–111.
3.
Forest Products Laboratory. Wood handbook: Wood as an engineering material. By forest products laboratory, forest service. Madison, Wisconsin, United States: U. S. Dept. of Agriculture, 2021.
4.
SantiniNSSchmitzNLovelockCE. Variation in wood density and anatomy in a widespread mangrove species. Trees2012; 26: 1555–1563.
5.
DíazSKattgeJCornelissenJ, et al.The global spectrum of plant form and function. Nature2016; 529: 167–171.
6.
ChaveJCoomesDJansenS, et al.Towards a worldwide wood economics spectrum. Ecol Lett2009; 12: 351–366.
7.
SikkemaRProskurinaSBanjaM,et al.How can solid biomass contribute to the EU’s renewable energy targets in 2020, 2030 and what are the GHG drivers and safeguards in energy- and forestry sectors. Renewable Energy2021; 165: 758–772.
8.
JamilKLiuDGulRF, et al.Do remittance and renewable energy affect CO2 emissions? An empirical evidence from selected G-20 countries. Energy Environ2021; 33: 916–932.
9.
KirikkaleliDGüngörHAdebayoTS. Consumption-based carbon emissions, renewable energy consumption, financial development and economic growth in Chile. Bus Strategy Environ2022; 31: 1123–1137.
10.
HaldarASethiN. Effect of institutional quality and renewable energy consumption on CO2 emissions−an empirical investigation for developing countries. Environ Sci Pollut Res2021; 28: 15485–15503.
11.
KircherM. Economic trends in the transition into a circular bioeconomy. J Risk Financial Manage2022; 15: 44.
12.
JakubowskiM. Cultivation potential and uses of paulownia wood: a review. Forests2022; 13: 668.
13.
HamdanHZHouriAF. CO2 sequestration by propagation of the fast-growing azolla spp. Environ Sci Pollut Res2022; 29: 16912–16924.
14.
TyśkiewiczKKonkolMKowalskiR, et al.Characterization of bioactive compounds in the biomass of black locust, poplar and willow. Trees2019; 33: 1235–1263.
15.
OlsCBontempsJ. Pure and even-aged forestry of fast-growing conifers under climate change: on the need for a silvicultural paradigm shift. Environ Res Lett2021; 16: 024030.
16.
AbreuMReisAMouraP, et al.Evaluation of the potential of biomass to energy in Portugal—conclusions from the CONVERTE project. Energies2020; 13: 37.
17.
AbbasiMPishvaeeMSBairamzadehS. Land suitability assessment for paulownia cultivation using combined GIS and Z-number DEA: a case study. Comput Electron Agric2020; 176: 105666.
18.
BarbuMCBuresovaKTudorEM,et al.Physical and mechanical properties of paulownia tomentosa x elongata sawn wood from Spanish, Bulgarian and Serbian plantations. Forests2022; 13: 1543.
19.
EstevesBCruz-LopesLVianaH, et al.The influence of age on the wood properties of Paulownia tomentosa (thunb.) steud. Forests2022; 13: 00.
20.
ŚwiechowskiKStegenta-DąbrowskaSLiszewskiM, et al.Oxytree pruned biomass torrefaction: process kinetics. Materials2019; 12: 3334.
21.
YorgunSYıldızDŞimşekYE. Activated carbon from paulownia wood: yields of chemical activation stages. Energy Sources Part A2016; 38: 2035–2042.
22.
CaoYSunGZhaiX, et al.Genomic insights into the fast growth of paulownias and the formation of paulownia witches’ broom. Mol Plant2021; 14: 1668–1682.
23.
SnowWA. Ornamental, crop, or invasive. The history of the Empress tree (Paulownia) in the USA. For Trees Livelihoods2015; 24: 85–96.
24.
EsslF. From ornamental to detrimental. The incipient invasion of Central Europe by Paulownia tomentosa. Preslia2007; 79: 377–389.
25.
ZhuZHChaoCJLuXY,et al.Paulownia in China: Cultivation and Utilization. Beijing, China: Asian Network for Biological Sciences and International Development Research Centre, 1986.
26.
MantanisG. Structure and properties of wood, part II: Properties. Technological Educational Institute (T.E.I.) of Larissa, Department of Wood and Furniture Design and Technology, 2003.
27.
TsoumisG. Science and technology of wood, Vol. A'-Structure and properties. Thessaloniki, Greece: Publ. Gartaganis, 2009, ISBN13: 9789606859021.
28.
MantanisG. Wood structure. Teaching textbook. Karditsa, Thessaly, Greece: University of Thessaly, Department of Forestry, Wood Sciences & Design, 2019.
29.
TurnerIM. The ecology of trees in the tropical rain forest. Cambridge, England, United Kingdom: Cambridge University Press, 2001.
30.
NockCAGeihoferDGrabnerM, et al.Wood density and its radial variation in six canopy tree species differing in shade-tolerance in western Thailand. Ann Bot2009; 104: 297–306.
31.
PlourdeBTBoukiliVKChazdonRL. Radial changes in wood specific gravity of tropical trees: inter- and intraspecific variation during secondary succession. Funct Ecol2015; 29: 111–120.
32.
Osazuwa-PetersOLWrightSJZanneAE. Radial variation in wood specific gravity of tropical tree species differing in growth-mortality strategies. Am J Bot2014; 101: 803–811.
33.
CahnRW.Encyclopedia of materials science and engineering, 1988. Supplementary.
34.
WichmannHESugiriDMohammed Serajul Islam HaakeD,et al.Lungenfunktion und Carboxyhämoglobin in der Smogsituation des Januar 1987. Zentbl Bakt Parasit Kde II1988; 187: 31–43.
35.
SilkJWFPaoliGMcGuireK, et al.Large trees drive forest aboveground biomass variation in moist lowland forests across the tropics. Global Ecol Biogeogr2013; 22: 1261–1271.
36.
BastinJBarbierNCouteronP, et al.Aboveground biomass mapping of African forest mosaics using canopy texture analysis: toward a regional approach. Ecol Appl2014; 24: 1984–2001.
37.
RamananantoandroTRafidimanantsoaHPRamanakotoMF. Forest aboveground biomass estimates in a tropical rainforest in Madagascar: new insights from the use of wood specific gravity data. J For Res2015; 26: 47–55.
38.
BastinJFFayolleATarelkinY, et al.Wood specific gravity variations and biomass of central African tree species: the simple choice of the outer wood. PLoS ONE2015; 10: e0142146.
39.
DibdiakovaJVadlaK. Basic density and moisture content of coniferous branches and wood in northern Norway. EPJ Web Conf2012; 33: 02005.
40.
ISO 13061-2:2014 Physical and mechanical properties of wood — Test methods for small clear wood specimens — Part 2: Determination of density for physical and mechanical tests.
41.
González-RodrigoBEstebanLGPalaciosP, et al.Variation throughout the tree stem in the physical-mechanical properties of the wood. Madera y Bosques2013; 19(2): 87–107. https://doi.org/10.21829/myb.2013.192342
AkyildizMHKolHS. Some technological properties and uses of paulownia (Paulownia tomentosa steud.) wood. J Environ Biol2010; 31: 351–355.
44.
KomanSFeherSVityiA. Physical and mechanical properties of Paulownia tomentosa wood planted in Hungaria. Wood Res2017; 62: 335–340.
45.
BardarovNPopovskaT. Examination of the properties of local origin Paulownia wood (Paulownia sp. Siebold & Zucc.). Manage Sustainable Dev2017; 69: 75–78.
46.
SedlarTŠefcBDrvodelićD, et al.Physical properties of juvenile wood of two Paulownia hybrids. Drv Ind2020; 71: 179–184.
47.
TomczakKManiaPJakubowskiM,et al.Radial variability of selected physical and mechanical parameters of juvenile paulownia wood from extensive cultivation in central Europe—case study. Materials2023; 16: 2615.
48.
Sánchez-MachadoJDMoyaR. Characterization of paulownia tomentosa steud trees grown in a 5-year-old plantation in Costa Rica. Cellul Chem Technol2021; 55: 743–753.
MoyaRMuñozF. Physical and mechanical properties of eight fast-growing plantation species in Costa Rica. J Trop For Sci2010; 22,(3): 317–328. https://www.jstor.org/stable/23616661
52.
TenorioCMoyaRSalasC,et al.Evaluation of wood properties from six native species of forest plantations in Costa Rica. Bosque (Valdivia)2016; 37(1): 71–84. https://doi.org/10.4067/S0717-92002016000100008
53.
PfautschSAspinwallMJDrakeJE, et al.Traits and trade-offs in whole-tree hydraulic architecture along the vertical axis of Eucalyptus grandis. Ann Bot2018; 121: 129–141.
54.
KaymakciABektasIBalB.Some mechanical properties of Paulownia (Paulownia elongata) Wood. In: Conference: International Caucasion forestry symposium, 2013.
55.
KollmannFFCôteWA. Principles of wood science and technology. Berlin, Germany: Springer, 1968.
56.
PernestalKJonssonBLarssonB. A simple model for density of annual rings. Wood Sci Technol1995; 29: 441–449.https://doi.org/10.1007/bf00194202
57.
HernándezRE. Influence of accessory substances, wood density and interlocked grain on the compressive properties of hardwoods. Wood Sci Technol2007; 41: 249–265.https://doi.org/10.1007/s00226-006-0114-5
