Physical Properties of Juvenile Wood of Two Paulownia Hybrids/Fizicka svojstva juvenilnog drva dvaju hibrida paulovnije

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 ofjuvenile 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 x Paulownia elongata) x (Paulownia fortunei x Paulownia tomentosa)) and the other hybrid is Shan Tong (Paulownia fortunei x Paulownia tomen-tosa). The aim of this study was to investigate physical properties ofjuvenile 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. Keywords: hybrid 9501; hybrid Shan Tong; juvenile wood; Paulownia wood; physical properties U današnje je vrijeme zamjetan sve cešci trend sadnje brzorastucih vrsta drveca (ophodnje od 5 do 10 godina). Te su vrste primarno namijenjene proizvodnji drvnih vlakana i biomase, ali svakako je vidljiv i njihov potencijal u proizvodima od cjelovitog drva. Jedna od brzorastucih vrsta je Paulownia sp., koju odlikuje izrazito brz rast. Iako se malo zna o tehnickim svojstvima drva paulovnije, a njegova je krajnja upotreba upitna, u Hrvatskoj je u porastu plantažni uzgoj paulovnije. U ovom su radu prikazani preliminarni rezultati istraživanja nekih fizickih svojstava juvenilnog drva hibrida paulovnije s lokaliteta u blizini grada Gline u Hrvatskoj. Prvi je hibrid 9501 ((Paulownia fortunei x Paulownia elongata) x (Paulownia fortunei x Paulownia tomentosa)), a drugi Shan Tong (Paulownia fortunei x Paulownia tomentosa). Cilj rada bio je istražiti fizicka svojstva juvenilnog drva hibrida paulovnije s lokaliteta u Hrvatskoj, utvrditi razlike u fizickim svojstvima drv