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Multivariate analysis of the variability in the density of oven-dry wood of silver birch (Betula pendula Roth.) in Poland

Lachowicz H., Paschalis-Jakubowicz P., Wojtan R.

Drewno : prace naukowe, doniesienia, komunikaty

2018

vol. 61, nr 201

39--56

This work presents the findings of a study concerning the variability in the density of oven-dry silver birch wood, depending on the geographical placement of tree stands, of the age and thickness of the trees, the influence of the forest habitat type and interactions occurring between chosen factors. The study was carried out on wood from trees aged approx. 30, 50 and 70 years old in 12 forest districts located throughout Poland. Altogether 4777 wood samples taken from 306 trees acquired on 51 test plots were measured. A significant influence of all the examined factors on the variability of the density of the oven-dry wood of the silver birch was proven. The highest mean values of the density of the birch wood in an oven-dry state were found in the Forest District of Giżycko in fresh mixed broadleaved forests – 669,85 kg/m3 and in the Forest District of Sokołów in fresh broadleaved forests – 662,04 kg/m3. For the entire examined material, mean values of the density of oven-dry wood are increasing along with age. In all three of the examined tree ages, the highest mean values were noted in the thinnest trees.