Wood properties of juvenile and mature heartwood in Robinia pseudoacacia L. |
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| Authors: | Oliver Dünisch Hans-Georg Richter Gerald Koch |
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| Institution: | (1) Master School for Carpentry, Ebern, Gleusdorfer Str. 14, Ebern, 96106, Germany;(2) Institute for Wood Technology and Wood Biology, Federal Research Institute of Rural Areas, Forestry and Fisheries (VTI), Leuschnerstr. 91, Hamburg, 21031, Germany |
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| Abstract: | The aim of this study is to characterise the properties of juvenile and mature heartwood of black locust (Robinia pseudoacacia L.). Content, composition and the subcellular distribution of heartwood extractives were studied in 14 old-growth trees from
forest sites in Germany and Hungary as well as in 16 younger trees of four clone types. Heartwood extractives (methanol and
acetone extraction) were analysed by HPLC-chromatography. UV microspectrophotometry was used to topochemically localise the
extractives in the cell walls. The natural durability of the juvenile and mature heartwood was analysed according to the European
standard EN 350-1. Growth as well as chemical analyses showed that, based on extractives content, the formation of juvenile
wood in black locust is restricted to the first 10–20 years of cambial growth. In mature heartwood, high contents of phenolic
compounds and flavonoids were present, localised in high concentrations in the cell walls and cell lumen of axial parenchyma
and vessels. In juvenile wood, the content of these extractives is significantly lower. Juvenile wood had a correspondingly
lower resistance to decay by Coniophora puteana (brown rot fungus) and Coriolus versicolor (white rot fungus) than mature heartwood. |
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