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36 records – page 1 of 4.

Basic wood properties of second-growth sitka spruce

https://library.fpinnovations.ca/en/permalink/fpipub5534
Author
Jozsa, Les A.
von Schilling, B.
Sen, P.
Date
January 1993
Edition
37459
Material Type
Research report
Field
Sustainable Construction
Author
Jozsa, Les A.
von Schilling, B.
Sen, P.
Contributor
British Columbia. Ministry of Forests. Queen Charlotte Forest District.
Date
January 1993
Edition
37459
Material Type
Research report
Physical Description
38 p.
Sector
Wood Products
Field
Sustainable Construction
Research Area
Advanced Wood Materials
Subject
Second growth
Picea
Physical properties
Mechanical properties
Growth
Series Number
W-1446
Location
Vancouver, British Columbia
Language
English
Abstract
The basic wood properties of 45-year-old second-growth sitka spruce were examined to determine if rapid growth produces poor wood quality. Five dominant and codominant trees were sampled from each of four stands with stocking densities of 520, 640, 1080, and 1520 stems/ha. Stem size, extent of live crown, yearly wood relative density trends, and longitudinal shrinkage were measured.
Picea sitchensis - Mechanical properties
Picea sitchensis - Physical properties
Second growth
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Basic wood properties of second-growth western hemlock

https://library.fpinnovations.ca/en/permalink/fpipub5879
Author
Jozsa, Les A.
Munro, B.D.
Gordon, J.R.
Date
March 1998
Edition
41165
Material Type
Research report
Field
Sustainable Construction
Author
Jozsa, Les A.
Munro, B.D.
Gordon, J.R.
Date
March 1998
Edition
41165
Material Type
Research report
Physical Description
51 p.
Sector
Wood Products
Field
Sustainable Construction
Research Area
Advanced Wood Materials
Subject
Tsuga Heterophylla
Tsuga
Second growth
Quality control
Qualitative analysis
Physical properties
Growth
Series Number
Special Publication ; SP-38
W-1444
Location
Victoria, British Columbia
Language
English
Abstract
This report describes some of the background and results of work done to date on second-growth western hemlock basic wood properties at Forintek Canada Corp. The B.C. Ministry of Forests (BCMOF) Research Branch, UBC Forestry Faculty and PAPRICAN were the other cooperating agencies on this project and they investigated live crown/tree growth relationships, strength properties of small clears, and pulping properties, respectively. Properties that were assessed by Forintek, both within and between trees include: relative density of wood, shrinkage, moisture content and relative proportion of heartwood-sapwood, bark thickness, content and distribution of compression wood, incidence and degree of spiral grain, incidence and severity of brown stain, and strength properties of small cleear bending samples. Naturally grown 90-year-old western hemlock stands represent much of the emerging timber supply in the B.C. coastal forest region. Information characterizing the commercial quality of this resource is needed now to support processing and marketing decisions and for product promotion. In addition, the BCMOF and industry members are making stand management decisions today which will determine the future quality of western hemlock. We can reduce the risk of making wrong investment decisions by providing information on how different growing conditions (e.g., biogeoclimatic zone, site, stand density, thinning) affect second-growth wood quality.
Second growth
Tsuga heterophylla - Physical properties
Growth - Influence on quality
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Biomass productivity and wood quality of white spruce

https://library.fpinnovations.ca/en/permalink/fpipub5456
Author
Jozsa, Les A.
Bramhall, Paul Arthur
Johnson, S.G.
Date
March 1985
Edition
36998
Material Type
Research report
Field
Sustainable Construction
Author
Jozsa, Les A.
Bramhall, Paul Arthur
Johnson, S.G.
Date
March 1985
Edition
36998
Material Type
Research report
Physical Description
43 p.
Sector
Wood Products
Field
Sustainable Construction
Research Area
Advanced Wood Materials
Subject
Picea
Growth
Series Number
CFS Contract 02-80-12-001
W-188
Location
Vancouver, British Columbia
Language
English
Abstract
Picea glauca - Density
Growth - Influence of climate
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Biomass productivity of white spruce in Alberta and Manitoba

https://library.fpinnovations.ca/en/permalink/fpipub5480
Author
Jozsa, Les A.
Bramhall, Paul Arthur
Johnson, S.G.
Date
August 1984
Edition
37101
Material Type
Research report
Field
Sustainable Construction
Author
Jozsa, Les A.
Bramhall, Paul Arthur
Johnson, S.G.
Date
August 1984
Edition
37101
Material Type
Research report
Physical Description
27 p.
Sector
Wood Products
Field
Sustainable Construction
Research Area
Advanced Wood Materials
Subject
Picea
Growth
Biomass
Alberta
Series Number
CFS No. 27
Contract No. 02-80-56-011
W-319
Location
Vancouver, British Columbia
Language
English
Abstract
Picea glauca - Growth
Biomass - Alberta
Biomass - Manitoba
Dendrochronology
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Les caractéristiques déterminant la qualité du bois: nature et conséquences pratiques

https://library.fpinnovations.ca/en/permalink/fpipub41843
Author
Jozsa, Les A.
Middleton, G.R.
Date
May 1997
Material Type
Research report
Field
Sustainable Construction
Author
Jozsa, Les A.
Middleton, G.R.
Date
May 1997
Material Type
Research report
Physical Description
42 p.
Sector
Wood Products
Field
Sustainable Construction
Research Area
Advanced Wood Materials
Subject
Trees
Quality control
Qualitative analysis
Canada
Series Number
Publication spéciale SP34F
E-3132
Location
Sainte-Foy, Québec
Language
French
ISBN
0864885261
ISSN
08250030
Abstract
Les auteurs définissent la qualité du bois en fonction de ses emplois, puis décrivent l'anatomie et la croissance du bois en regard de ses caractéristiques microscopiques et macroscopiques telles qu'observées en coupe transversale. Les exigences liées aux emplois sont énoncées selon les différentes classes de bois. Diverses caractéristiques déterminant la qualité du bois sont présentées et leurs conséquences pratiques pour la transformation du bois et les produits sont expliquées. Ces caractéristiques sont: la densité du bois, les variations de la densité, la répartition des bois juvénile et adulte, la proportion de duramen et d'aubier, la longueur des fibres, l'orientation des microfibrilles, le bois de compression, les noeuds, le grain ou la texture, le fil et les substances extractibles. Enfin, les auteurs traitent de la possibilité de modifier les paramètres de croissance de l'arbre et la qualité du bois grâce à un contrôle de la densité du peuplement. Les forestiers sont invités à prendre en considération les répercussions des travaux sylvicoles propres à chaque station.
Assessment Methods
Forest - Resource
Forintek Canada Corp. - Publications
Qualite
Quality
Resource Assessment
Trees - Physiology
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Climatic reconstruction from tree rings

https://library.fpinnovations.ca/en/permalink/fpipub701
Author
Jozsa, Les A.
Oguss Robertson, E.
Date
March 1985
Edition
36997
Material Type
Research report
Field
Sustainable Construction
Author
Jozsa, Les A.
Oguss Robertson, E.
Date
March 1985
Edition
36997
Material Type
Research report
Physical Description
1 v.
Sector
Wood Products
Field
Sustainable Construction
Research Area
Advanced Wood Materials
Subject
Rings
Growth
Canada
Series Number
CFS Contract 02-80-12-018
W-187
Location
Vancouver, British Columbia
Language
English
Abstract
Dendrochronology
Annual rings
Climate - Canada
Growth - Influence of climate
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Climatic studies based on tree-ring data

https://library.fpinnovations.ca/en/permalink/fpipub5468
Author
Jozsa, Les A.
Oguss Robertson, E.
Bramhall, Paul Arthur
Johnson, S.G.
Date
May 1983
Edition
37033
Material Type
Research report
Field
Sustainable Construction
Author
Jozsa, Les A.
Oguss Robertson, E.
Bramhall, Paul Arthur
Johnson, S.G.
Date
May 1983
Edition
37033
Material Type
Research report
Physical Description
43 p.
Sector
Wood Products
Field
Sustainable Construction
Research Area
Advanced Wood Materials
Subject
Rings
Series Number
CFS Contract 02-80-55-005
W-241
Location
Vancouver, British Columbia
Language
English
Abstract
Dendrochronology
Climate
Annual rings
Documents
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Confirmation of stand density effects on lodgepole pine wood characteristics

https://library.fpinnovations.ca/en/permalink/fpipub5514
Author
Middleton, G.R.
Jozsa, Les A.
Munro, B.D.
Sen, P.
Date
July 1995
Edition
37389
Material Type
Research report
Field
Sustainable Construction
Author
Middleton, G.R.
Jozsa, Les A.
Munro, B.D.
Sen, P.
Contributor
British Columbia Ministry of Forests. Silviculture
Date
July 1995
Edition
37389
Material Type
Research report
Physical Description
34 p.
Sector
Wood Products
Field
Sustainable Construction
Research Area
Advanced Wood Materials
Subject
Stands
Quality control
Qualitative analysis
Pinus contorta
Pinus
Physical properties
Growth
Series Number
W-1234
Location
Vancouver, British Columbia
Language
English
Abstract
In a previously completed study, lumber obtained from a 95-year old lodgepole pine sample representing a final stand density of 700 live stems/hectare (s/ha) was found to have relatively low modulus- of-rupture (MOR) and modulus of elasticity (MOE). It was determined that this resulted from lower than average basic wood density, and larger than average knot size particularly in large diameter trees. It was also determined that average MOR and MOE could be predicted to some extent (R2 > .60) on the basis of tree diameter-at-breast height (d.b.h.) and breast-height average basic wood density. Before accepting the above results as typical of lodgepole pine of similar age and final stand density, it was considered important to compare the relationships between d.b.h. and breast-height wood density observed in this 700 s/ha sample with that of trees in open-stand-densities in other regions. Average branch size added only marginally to explained variation in the predictive equation, but knot size is known to effect lumber strength. Thus a measure of branch size was included in the current study plan. Biogeoclimatic zones were chosen as the basis for regional comparisons. A minimum of 30 trees were selected from open-stand sites in each of the following five biogeoclimatic zones: Montane Spruce (MS), Engelmann Spruce-Subalpine Fir (ESSF), Interior Douglas-Fir (IDF), Interior Cedar-Hemlock (ICH) and Sub-Boreal Spruce (SBS). Sampling was systematic by d.b.h. to ensure representation of small, medium and large diameter trees. Stem counts were made in 1/200 ha plots around each sample tree to ensure that samples were indicative of a relatively open stand density. Average basic wood density at breast height was determined from two pith-to-bark increment cores obtained from each sample tree. The size and height of the largest branch in the first 5 m of tree height was measured and recorded. Average basic wood density values and estimates of branch size obtained for the five samples in this study were compared to the values and estimates obtained from the original 700 s/ha sample site. Basic wood density obtained from three of the sites was not significantly different from that of the 700 s/ha sample. It was significantly higher in one site (ICH) and significantly lower in another (ESSF). The higher wood density was possibly the result of a slower growth rate to 30 years combined with older average tree age. The significantly lower wood density was attributed to a younger average stand age (80 years). Basic wood density showed a consistent relationship with d.b.h. in all of the tree samples, tending down as d.b.h. increased. There was a less consistent relationship between knot size and d.b.h. but what relationship there was would serve to reinforce the effect of differences in wood density on lumber strength and stiffness. Average size of the largest knots was smallest in the tree sample where wood density was highest, and largest in the sample where wood density was lowest. Important lumber strength determining tree characteristics (wood density and knot size) that resulted in the low MOE and MOR at the original 700 s/ha sample site were found to be unexceptional when compared to trees of similar age and final stand densities in other biogeoclimatic zones. Although a slower than average growth rate to 30 years offers a plausible explanation for the higher than expected wood density in the ICH sample, further investigation is recommended.
Pinus contorta Dougl. var. latifolia - Density
Density - Influence on physical properties
Stand density
Growth - Influence on quality
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Density of 50-year old western hemlock and amabilis fir : commercial thinnings from North Vancouver Island

https://library.fpinnovations.ca/en/permalink/fpipub5533
Author
Jozsa, Les A.
Gordon, J.R.
Date
November 1997
Edition
37457
Material Type
Research report
Field
Sustainable Construction
Author
Jozsa, Les A.
Gordon, J.R.
Date
November 1997
Edition
37457
Material Type
Research report
Physical Description
26 p.
Sector
Wood Products
Field
Sustainable Construction
Research Area
Advanced Wood Materials
Subject
Tsuga Heterophylla
Tsuga
Balsam
Fir
Series Number
W-1440
Location
Vancouver, British Columbia
Language
English
Abstract
Commercial thinning at a relatively young age will result in changes not only to log size but to wood quality as well. One important change in the thinnings will be the increased proportion of juvenile wood relative to mature wood. In western hemlock (Tsuga heterophylla (Raf.) Sarg.), where the difference in wood density between juvenile wood and mature wood is relatively large, a higher proportion of juvenile wood can result in reduced lumber strength and lower pulp yields. Another change will be seen after thinning in the remaining standing trees; late-release growth pattern changes in terms of grain. The present report summarizes the results of X-ray densitometric analysis of 50-year-old western hemlock trees thinned from 1656 and 956 stems/ha plots, and amabilis fir (Abies amabilis (Dougl.) Forbes) from the 956 stems/ha plot. Results were compared to old-growth reference data, and to a recently completed basic wood properties study of 90-year-old western hemlock (Jozsa et. al., 1997).
Density
Tsuga heterophylla - Density
Abies amabilis - Density
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Direct reading X-ray densitometer

https://library.fpinnovations.ca/en/permalink/fpipub41017
Author
Jozsa, Les A.
Myronuk, R.S.
Date
March 1986
Material Type
Research report
Field
Sustainable Construction
Author
Jozsa, Les A.
Myronuk, R.S.
Date
March 1986
Material Type
Research report
Physical Description
15 p.
Sector
Wood Products
Field
Sustainable Construction
Research Area
Advanced Wood Materials
Subject
Density
Rings
Measurement
X ray analysis
Series Number
CFS No. 21;04-55-12-001
W-391
Location
Vancouver, British Columbia
Language
English
Abstract
Densitometers
Documents
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36 records – page 1 of 4.