Decay resistance, extractive content, and water sorption capacity of Siberian larch (Larix sibirica Lebed.) heartwood timber

Sammanfattning

The aim of this study was to find chemical or physical properties of Siberian larch heartwood timber that correlate with the variation in decay resistance. Juvenile heartwood from 24-year-old grafts of 15 clones was exposed to three brown-rot fungi according to the standard in vitro decay test ( European standard EN 113). The mass losses caused by the brown rot fungi Coniophora puteana, Poria placenta, and Gloeophyllum trabeum were 20%, 28% and 17% of the dry mass, respectively. The average mass loss over the three fungi had a strong negative correlation with the concentration of taxifolin (r = -0.673, P = 0.006), as well as with the concentration of total phenolics determined by the Folin-Ciocalteu assay (r = -0.677, P = 0.006). Thus, the concentration of flavonoids is a promising property for indirect measurement of the decay resistance of Siberian larch timber. The most abundant heartwood extractives, arabinogalactans, had a non-significant relationship with the decay resistance, but their concentration correlated positively with the capacity of the wood to adsorb water (r = 0.736, P = 0.002). The hygroscopic properties of the wood or the wood density were not associated with the decay resistance

Publicerad i

Holzforschung
2006, volym: 60, nummer: 1, sidor: 99-103
Utgivare: WALTER DE GRUYTER & CO

SLU författare

• Terziev, Nasko

  • Institutionen för skogens produkter, Sveriges lantbruksuniversitet
    

UKÄ forskningsämne

Skogsvetenskap

Publikationens identifierare

• DOI: https://doi.org/10.1515/HF.2006.017

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/9603