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Titre du document / Document title

Effect of extraction on wood density of western hemlock (Tsuga heterophylla (Raf.) Sarg.)

Auteur(s) / Author(s)

SINGLETON Ryan (1) ; DEBELL Dean S. (2) ; GARTNERT Barbara L. (1) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) Department of Wood Science and Engineering, Oregon State University, Corvallis, OR 97331, ETATS-UNIS
(2) Pacific Northwest Research Station, 3625-93rd Avenue SW, Olympia, WA 98512, ETATS-UNIS

Résumé / Abstract

Extractives can account for between 1 to 20% of the oven-dry weight of wood of various tree species and can influence wood density values appreciably. Removing these chemical deposits (extraction) in wood samples can help establish a consistent baseline for comparing wood densities where extractives are expected to differ between sample parameters. Although western hemlock is a very important timber species in the Pacific Northwest, laboratories that determine wood density may or may not remove extractives prior to density assessment. Wood density values were compared before and after extraction for 19 young-growth western hemlock samples. Extraction was performed using 95% ethyl alcohol-toluene solutions. Ring density values averaged 0.045 g/cm3 lower for extracted samples compared to unextracted samples across rings. Slightly higher amounts of extractives were found at rings near the pith; however, a general consistency in extractive content existed among samples and along the radial profile.

Revue / Journal Title

Wood and fiber science    ISSN  0735-6161   CODEN WFSCD4 

Source / Source

2003, vol. 35, no3, pp. 363-369 [7 page(s) (article)] (16 ref.)

Langue / Language

Anglais

Editeur / Publisher

Society of Wood Science and Technology, Madison, WI, ETATS-UNIS  (1983) (Revue)

Mots-clés anglais / English Keywords

Spermatophyta

;

Gymnospermae

;

Coniferales

;

Physical properties

;

Densitometry

;

Extraction

;

Softwood

;

Tsuga heterophylla

;

Experimental study

;

Mots-clés français / French Keywords

Spermatophyta

;

Gymnospermae

;

Coniferales

;

Propriété physique

;

Densitométrie

;

Extraction

;

Bois résineux

;

Tsuga heterophylla

;

Etude expérimentale

;

Mots-clés espagnols / Spanish Keywords

Spermatophyta

;

Gymnospermae

;

Coniferales

;

Propiedad física

;

Densitometría

;

Extracción

;

Madera de coníferas

;

Tsuga heterophylla

;

Estudio experimental

;

Localisation / Location

INIST-CNRS, Cote INIST : 17125, 35400011260065.0050

Nº notice refdoc (ud4) : 15037762



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