WOOD RESEARCH Volume 65, Number 6, 2020
Rudolf Petráš, Julian Mecko, Danica Krupová, and Pažitný Andrej

Aboveground biomass basic density of hardwoods tree species

The influence of tree species on basic density of wood, bark and small-wood was investigated here. Experimental material was obtained from 73 trees of 7 tree species, namely alder (Alnus glutinosa (L.) Gaertn.), beech (Fagus sylvatica L.), birch (Betula pendula Roth.), hornbeam (Carpinus betulus L.), Black locust (Robinia pseudoacacia L.), Sessile oak (Quercus petraea (Matt.) Liebl.) and Turkey oak (Quercus cerris L.) from the territory of Slovakia. Wood and bark samples were taken from discs cut from three trunk sections and from small-wood and branch parts coming from tree crowns. The volume of green samples was measured in graduated cylinders with a precision of 1 ml; a dry matter was measured with a precision of 0.01 g. The statistically significant effect has been shown in tree species, biomass fractions and locations on the tree. The average basic density of all species varies from 440 to 650 kg.m-3 for wood, for bark it is 380-670 kg.m-3 and for small-wood outside bark it reaches 490-650 kg.m-3. Alder and Black locust tree species have the lowest and highest wood density, Black locust and Turkey oak of bark and alder and Turkey oak of small-wood.

WOOD RESEARCH Volume 64, Number 2, 2019
Rudolf Petráš, Julian Mecko, Danica Krupová, Marián Slamka, and Pažitný Andrej

Aboveground biomass basic density of softwoods tree species

Experimental material was obtained from 43 trees of four tree species, namely pine, fir, larch and spruce from the territory of Slovakia. Wood and bark samples were taken from the discs in three locations on a stem and from small-wood, branches coming from tree crowns. The volume of fresh samples was measured in calibrated graduated cylinders with a precision of 1 ml; a dry matter was measured with a precision of 0.01 g. The statistically significant effect has been shown in tree species, fractions of biomass and locations on the tree using a special software based on ANOVA. The average basic density of wood for all species ranges from 373 to 508 kg. m-3. For bark it is 333-551 kg. m-3 and for small-wood outside bark it reaches 406-535 kg. m-3. The fir and larch have the lowest and highest values for wood density; pine and fir for bark density and pine and spruce species for small-wood density.