scholarly journals Wood quality of Douglas fir (Pseudotsuga menziesii (Mirb) Franco) from three stands in the Netherlands

1996 ◽  
Vol 53 (6) ◽  
pp. 1127-1136 ◽  
Author(s):  
JE Polman ◽  
H Militz
Keyword(s):  
The Netherlands ◽  
Pseudotsuga Menziesii ◽  
Wood Quality ◽  
Douglas Fir

Heritability and phenotypic and genetic correlations of coastal Douglas-fir (Pseudotsuga menziesii) wood quality traits

2008 ◽  
Vol 38 (6) ◽  
pp. 1536-1546 ◽  
Author(s):  
Nicholas K. Ukrainetz ◽  
Kyu-Young Kang ◽  
Sally N. Aitken ◽  
Michael Stoehr ◽  
Shawn D. Mansfield
Keyword(s):  
Cell Wall ◽  
Genetic Control ◽  
Pseudotsuga Menziesii ◽  
Wood Quality ◽  
Genetic Correlations ◽  
Douglas Fir ◽  
Correlated Response ◽  
Sample Population ◽  
Quality Traits ◽  
Glucose Content

Genetic control and relationships among coastal Douglas-fir ( Pseudotsuga menziesii (Mirb.) Franco var. menziesii) growth and wood quality traits were assessed by estimating heritability and phenotypic and genetic correlations using 600 trees representing 15 full-sib families sampled from four progeny test sites. Heritability estimates ranged from 0.23 to 0.30 for growth traits, 0.19 for fibre coarseness, from 0.21 to 0.54 for wood density, from 0.16 to 0.97 for cell wall carbohydrates, and 0.79 and 0.91 for lignin content at two sites, Squamish River and Gold River, respectively. Glucose content, indicative of cell wall cellulose composition, and lignin were shown to be under strong genetic control, whereas fibre coarseness was shown to be under weak genetic control. Phenotypic correlations revealed that larger trees generally have longer fibres with higher fibre coarseness, lower density, lower carbohydrate content, a greater proportion of cell wall lignin, and higher microfibril angle. Genetic correlations and correlated response to selection suggest that breeding for height growth would result in a reduction in wood quality, whereas breeding for improved earlywood density in Douglas-fir would result in negligible reductions in volume and appears to be an ideal target for selecting for improved wood quality (density) while maintaining growth in the sample population.

Energy Input and Quality of Pellets Made from Steam-Exploded Douglas Fir (Pseudotsuga menziesii)

2011 ◽  
Vol 25 (4) ◽  
pp. 1521-1528 ◽  
Author(s):  
Pak Sui Lam ◽  
Shahab Sokhansanj ◽  
Xiaotao Bi ◽  
C. Jim Lim ◽  
Staffan Melin
Keyword(s):  
Pseudotsuga Menziesii ◽  
Energy Input ◽  
Douglas Fir

Relationships Between Sapwood Amount, Latewood Percentage, Moisture Content and Crown Vitality of Douglas Fir, Pseudotsuga Menziesii

IAWA Journal ◽  
1993 ◽  
Vol 14 (4) ◽  
pp. 413-427 ◽  
Author(s):  
Ingrid de Kort
Keyword(s):  
The Netherlands ◽  
Moisture Content ◽  
Pseudotsuga Menziesii ◽  
Douglas Fir

Relationships between sapwood amount, latewood percentage, moisture content and crown vitality were studied in 171 Douglas firs [Pseudotsuga menziesii (Mirb.) Franco] belonging to different vitality classes. The trees originated from 10 stands in the Netherlands varying in age from 25-70 years.

Sinuous stem growth in a Douglas-fir (Pseudotsuga menziesii) plantation: growth patterns and wood-quality effects

2000 ◽  
Vol 30 (5) ◽  
pp. 761-768 ◽  
Author(s):  
R Spicer ◽  
B L Gartner ◽  
R L Darbyshire
Keyword(s):  
Pseudotsuga Menziesii ◽  
Compression Wood ◽  
Wood Quality ◽  
Radial Distance ◽  
Wood Properties ◽  
Wood Formation ◽  
Douglas Fir ◽  
Growth Patterns ◽  
Internode Length ◽  
Tree Biomechanics

Stem sinuosity is thought to negatively impact wood quality, but no studies have characterized its vertical and radial effects on wood properties. Here we study wood quality along the entire stem in 25-year-old plantation-grown Douglas-fir (Pseudotsuga menziesii var. menziesii (Mirb.) Franco) trees (32 trees total) that had been scored for sinuosity at age 12. We also study compression wood formation in the radial direction for one internode that had been scored for sinuosity at age 12 and subsequently produced 13 more annual rings. Trees with highly sinuous leaders at age 12 were more likely to be sinuous in other years, and developed more slope of grain defect (approximately 15% log volume) than less sinuous trees, but did not differ in the size of the pith-containing core. Leaders originally scored as highly sinuous developed more compression wood than control trees but only near the pith. Internode length did not differ among sinuosity classes. The size of the pith deviations (radial distance from centreline) remained constant up the stem despite a decline in internode length. However, the frequency of pith deviations was highest at 10-15 years, when internode length reached a peak. The relationship between temporal patterns of growth rate, sinuosity, and tree biomechanics deserves further attention.

Tracheid Length in Vital and Non Vital Douglas Fir (Pseudotsuga Menziesii) in the Netherlands

IAWA Journal ◽  
1990 ◽  
Vol 11 (2) ◽  
pp. 203-209 ◽  
Author(s):  
Ingrid de Kort
Keyword(s):  
The Netherlands ◽  
Pseudotsuga Menziesii ◽  
Growth Ring ◽  
Ring Width ◽  
Douglas Fir ◽  
Growth Reduction ◽  
Tracheid Length ◽  
Growth Ring Width ◽  
Temporary Growth

Tracheid length in relation to growth ring width is recorded for five Douglas firs from different sites in the Netherlands. The investigated trees differed in vitality assessed by crown appearance. Non vital trees showed a growth reduction which coincides with a decrease in tracheid length. Temporary growth reductions in vital trees did not result in a decrease of tracheid length. The relations hip between tracheid length and ring width is discussed.

scholarly journals Growth of Residual Branches on Pruned Coastal Douglas-Fir

2003 ◽  
Vol 18 (3) ◽  
pp. 185-188 ◽  
Author(s):  
Eric C. Turnblom ◽  
Randol L. Collier
Keyword(s):  
Pseudotsuga Menziesii ◽  
Branch Length ◽  
Douglas Fir ◽  
Anecdotal Evidence ◽  
Modest Increase ◽  
Branch Growth ◽  
Real Risk ◽  
Branch Size

Abstract Anecdotal evidence gathered from pruning crew observations indicates that there may be enhanced branch growth at the new crown base in young pruned coastal Douglas-fir (Pseudotsuga menziesii var. menziesii) trees compared to unpruned trees. This has the potential to reduce the quality and value of the stem above the pruned portion of the bole. An analysis of the size of branches in the remaining crown on pruned trees and matched unpruned trees of the same size at the time of pruning indicates that residual branches do not increase in diameter or length in response to light and moderate pruning. However, with a severe pruning there was a modest increase in branch length. Residual branch size in response to pruning 4 yr after treatment appears to offer no real risk in degrading quality of the unpruned portion of the stem as a cost for increasing the quality of the pruned stem. West. J. Appl. For. 18(3):185–188.

scholarly journals Stand development and stem form of the Douglas Fir (Pseudotsuga taxifolia Britt.) in the Netherlands.

1954 ◽  
Vol 2 (4) ◽  
pp. 265-272
Author(s):  
A. van Laar
Keyword(s):  
The Netherlands ◽  
Pseudotsuga Menziesii ◽  
Douglas Fir ◽  
Japanese Larch ◽  
Stand Development ◽  
Stem Form

Increment measurements on 65 heavily thinned trial plantations are used to show the development of stands in the Netherlands up to 30 years. Yields compare satisfactorily with Kanzow's yield tables for Prussia (1937), but are considerably below those of Grandjean and Soest [cf. F.A. 15 No. 567]. A taper table was derived from 801 trees measured after felling. At heights below 20 m. the stem forms of Douglas Fir and Japanese Larch, as shown in figures obtained by Schober [cf. F.A. 15 No. 1656], correspond closely with each other, but above 20 m. the former tapers more rapidly. KEYWORDS: Increment \ mensuration \ forests \ Pseudotsuga taxifolia \ Pseudotsuga menziesii \ aggr. form \ stem \ Pseudotsuga taxifolia \ Pseudotsuga menziesii \ aggr. yield \ taper \ tables \ stem form \ s \ yield tables (Abstract retrieved from CAB Abstracts by CABI’s permission)

The effects of fertilization and thinning on wood quality of a 24-year-old Douglas-fir stand

1989 ◽  
Vol 19 (9) ◽  
pp. 1137-1145 ◽  
Author(s):  
L. A. Jozsa ◽  
H. Brix
Keyword(s):  
Wood Quality ◽  
Ring Width ◽  
Douglas Fir ◽  
Ring Density ◽  
Beneficial Effects ◽  
Reduced Ring ◽  
Increasing Trend ◽  
Poor Site ◽  
Intermediate Effect

This report describes the growth and wood density response of a coastal Douglas-fir (Pseudotsugamenziesii (Mirb.) Franco) stand on a poor site to thinning and nitrogen fertilization. The treatment plots were established in 1971 and 1972 at about 24 years of age. The effects of fertilization and thinning were evaluated 12 and 13 years after the initial treatments of the 1972 and 1971 plots, respectively, and 3 years after refertilization of the 1972 plots in 1981. Ring-width and ring-density data were obtained from pith to bark for all trees and were derived from computerized X-ray densitometry. Fertilization reduced ring density at breast height and 25% stem height by an average of 16% for a 3- to 4-year period after treatment, but not thereafter. Reductions in ring density resulted from decreases in the density of early wood and latewood, as well as from decreases in the percent of latewood. Effects were only pronounced in the lower half of the stem. Thinning resulted in a slight ring-density gain in the lower bole and a reduction in the top. The combined treatments had an intermediate effect on ring density. Ring density showed an increasing trend from pith to bark at all heights, except at the 75% height, and a decrease with increasing height in the bole. Fertilization and thinning both increased diameter growth, and their beneficial effects were still evident 13 years after treatments.

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