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Titolo:
Second-growth western hemlock product yields and attributes related to stand density
Autore:
Middleton, G; Munro, D; Dai, CP; Morris, P; Lum, C; Williams, D; Watson, P; Gee, W; Johal, S; Reath, S; Yuen, B; Hussein, A;
Indirizzi:
Forintek Canada Corp, Western Lab, Vancouver, BC V6T 1W5, Canada Forintek Canada Corp Vancouver BC Canada V6T 1W5 uver, BC V6T 1W5, Canada
Titolo Testata:
SUSTAINABLE PRODUCTION OF FOREST PRODUCTS 2000, PROCEEDINGS
, volume: 520, anno: 2000,
pagine: 43 - 47
Fonte:
ISI
Lingua:
ENG
Keywords:
second-growth; western hemlock; Tsuga heterophylla; stand density; growth rate; juvenile wood; lumber; veneer; LVL; pulp; machining; treated wood; mechanical properties;
Tipo documento:
Article
Natura:
Collana
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
3
Recensione:
Indirizzi per estratti:
Indirizzo: Middleton, G Forintek Canada Corp, Western Lab, 2665 E Mall, Vancouver, BCV6T 1W5, Canada Forintek Canada Corp 2665 E Mall Vancouver BC Canada V6T 1W5
Citazione:
G. Middleton et al., "Second-growth western hemlock product yields and attributes related to stand density", USDA PAC NW, 520, 2000, pp. 43-47

Abstract

The effect of stand density on 90-year old western hemlock tree and wood characteristics was determined to assist foresters with stand density management. Trees were selected from three Vancouver Island stands. Stand densities were 580 and 930 stems per hectare (sph) at two northern locations, and 930 sph at a stand 500 km south. Mean breast-height wood densities were .42, .45 and .47 respectively. The 580 sph stand trees had fastest early growth rate, were taller, larger in diameter, had largest branches, and highest taper. The southern 930 sph stand had the slowest early rate-of growth. Tested in bending, lumber mean modulus-of-elasticity (MOE) and mean modulus-of-rupture (MOR) differed significantly by stand density, and average early growth rate. The 580 sph stand had the lowest proportions of high grade structural lumber and the lowest MOE and MOR values. Structural properties of veneer, LVL, and small clears were consistent by stand with those of lumber. Lumber machined as well, and treated more easily than old growth hemlock. Kraft and TMP pulp properties did not differ significantly by stand. Kraft pulp yields were 1 to 3 percent higher than those published for western hemlock.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/06/20 alle ore 02:32:35