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2010 | 52 | 1 |
Tytuł artykułu

Size and localisation of knots in timber from mountain spruce stands in the Dolomites

Treść / Zawartość
Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
The aim of the study was evaluation of knots in wood of 150-year-old Norway spruce [Picea abies (L.) Karst.] in stands situated at the altitude of 1450– 1740 m above sea level in the Dolomites in Italian section of the Alps. In selected stands, spruce trees were cut down and their length, stem thickness, height to the crown base and stem diameters at every 1 m along the length of merchantable bole were measured. The diameter of knots was measured and they were classified according to their healthiness and the degree of their tightness with the surrounding wood. The relative knot diameters were calculated and the relative height of their location on stem was determined. In total on sample trees there were analysed 1070 knots, of which sound knots (close to 75%) and tight (more than 60%) prevailed. Sound and tight knots had largest diameters, relative diameters and relative heights of location on merchantable boles. The smallest diameters and relative diameters were indicated by rotten and not tight knots that were located at the lowest merchantable bole parts.
Słowa kluczowe
Wydawca
-
Rocznik
Tom
52
Numer
1
Opis fizyczny
p.13-19,fig.,ref.
Twórcy
autor
  • Department of Forest and Wood Utilization, Agricultural University, Al.29 Listopada 46, 31-425 Krakow, Poland
autor
  • IVALSA/CNR Trees and Timber Institute, 38010 San Michele all Adige, via Biasi 75, Italy
autor
  • IVALSA/CNR Trees and Timber Institute, 38010 San Michele all Adige, via Biasi 75, Italy
Bibliografia
  • Barszcz A. 1995. Ocena jakości surowca drzewnego i zmienności wad drewna w rębnych drzewostanach świerkowych na terenie Beskidów. Zesz. Nauk. AR Kraków, 199 pp.
  • Barszcz A. 1999. The variability of features and sizes of knots and their relation to location on stems in spruce timber from thinned stands. Sci. Pap. Agric. Univ. Poznań, Forestry 2, 3– 12.
  • Barszcz A., Gjerdrum P. 2008. The zonality of occurrence of knots and relations between their location and size in large-dimensioned spruce stems in south-eastern Norway. EJPAU. 11 (3), 305.
  • Gjerdrum P., Høibø O. 2008. Modelling knot size and distribution in sawn boards from large sized trees of Norway spruce. [In:] Modelling connection between forest resources and wood quality. IUFRO WP 5.01.04, Koli, Finland, 08– 14.06.2008, 37.
  • Kantola A., Mäkinen H., Mäkelä A. 2007. Stem form and branchiness of Norway spruce as a sawn timber – predicted by a process based model. For. Ecol Manag., 241, 209– 222.
  • Moberg L. 2006. Predicting knot properties of Picea abies and Pinus sylvestris from generic tree descriptors. Scand. J. For. Res., 21, 49– 62.
  • Modrzyński J. 1998. Ekologia. [In:] Ekologia świerka pospolitego (eds: A. Boratyński, W. Bugała). Wyd. Nauk. Poznań, 303– 426.
  • PN–79/D–01011.1980. Drewno okrągłe. Wady. Wyd. Normalizacyjne, Warsaw, Poland.
  • PN–93/D–02002.1993. Surowiec drzewny. Podział, terminologia i symbole. Wyd. Normalizacyjne, Warsaw, Poland.
  • PN-EN 1310. 2000. Drewno okrągłe i tarcica. Metody pomiaru cech. PKN, Warsaw, Poland.
Typ dokumentu
Bibliografia
Identyfikatory
Identyfikator YADDA
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