Growth of Thuja plicata seedlings along a light gradient

1994 ◽  
Vol 72 (12) ◽  
pp. 1749-1757 ◽  
Author(s):  
G. G. Wang ◽  
H. Qian ◽  
K. Klinka
Keyword(s):  
Leaf Area ◽  
Specific Leaf Area ◽  
Root Biomass ◽  
Growth Response ◽  
Thuja Plicata ◽  
Red Cedar ◽  
Light Gradient ◽  
Biomass Ratio ◽  
Western Red Cedar ◽  
Growth Characters

To improve understanding of light – growth response relationships in western red cedar, seedlings were grown on three environmentally comparable sites representing nearly optimum growth conditions for the species in coastal British Columbia. On each site, the seedlings were planted on transects extending from a clearcut to the interior of an adjacent old-growth stand. After three growing seasons, seedling mortality, vigour, growth characters, and foliar nutrients were compared across five light classes and between study sites using analysis of variance and related to the percentage of above-canopy light available to each seedling using regression analysis. Three-year mortality was ≤ 27%, and most mortality (≥ 85%) occurred at ≤ 20% of above-canopy light. Seedling growth improved consistently with increasing light; however, the actual growth response at > 40% of above-canopy light varied with study site. The pattern of variation in the growth characters suggested that planted seedlings were able to acclimate morphologically to varying light conditions in three structural traits typically associated with shade adaptation: specific leaf area, height to caliper ratio, and aboveground to root biomass ratio. Specific leaf area and height to caliper ratio decreased and aboveground to root biomass ratio increased with increasing light. This study does not support the contention that under optimal moisture and nutrient conditions carbohydrate deficiency increases the allocation of net biomass production to aboveground structures. We consider western red cedar in the study area to be a. very shade-and exposure-tolerant species but not one that is specifically adapted to an understory environment. Key words: Thuja plicata seedlings, light – growth response relationships, specific leaf area, height to caliper ratio, aboveground to root biomass ratio, shade tolerance.

Characterization of the complete plastome of western red cedar, Thuja plicata (Cupressaceae)

2017 ◽  
Vol 11 (1) ◽  
pp. 79-81
Author(s):  
Kole F. Adelalu ◽  
Xiao-Jian Qu ◽  
Yan-Xia Sun ◽  
Tao Deng ◽  
Hang Sun ◽  
...  
Keyword(s):  
Thuja Plicata ◽  
Red Cedar ◽  
Western Red Cedar

THE BEHAVIOUR OF FIVE WOOD SPECIES IN COMPRESSION

IAWA Journal ◽  
2002 ◽  
Vol 23 (2) ◽  
pp. 201-211 ◽  
Author(s):  
Simon Ellis ◽  
Paul Steiner
Keyword(s):  
Young’S Modulus ◽  
Populus Tremuloides ◽  
Wood Species ◽  
Young's Modulus ◽  
Douglas Fir ◽  
Thuja Plicata ◽  
Trembling Aspen ◽  
Moisture Contents ◽  
Red Cedar ◽  
Western Red Cedar

Five wood species, Oregon ash (Fraxinus latifolia Benth.), Balau (Shorea spp.), Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco), Western red cedar (Thuja plicata Donn ex D. Don), and Trembling aspen (Populus tremuloides Michx.) were loaded in compression longitudinally, radially and tangentially. The wood cubes were conditioned to one of four moisture contents prior to loading. Small cubes were loaded until no void space remained after which samples were released and soaked in water. Stress /strain curves were recorded over the whole range of strain and cube thicknesses were recorded at the end of the compression, after release from the testing apparatus, and after soaking in water. Denser woods resulted in a greater Young’s modulus, higher levels of stress and shorter time to densification than did less dense woods. Higher initial moisture contents apparently increased the plasticity of the wood leading to a lower Young’s modulus and lower levels of stress during compression, greater springback after release of stress and greater recovery after swelling in water. Differences observed in the radial and tangential behaviours were believed to be due to the supporting action of the rays when the wood was compressed in the radial direction in balau and trembling aspen and to the relative difference between the lower density earlywood and higher density latewood regions in ash, Douglas-fir and western red cedar.

Selfing and correlated paternity in relation to pollen management in western red cedar seed orchards

Botany ◽  
2020 ◽  
Vol 98 (7) ◽  
pp. 353-359
Author(s):  
Kermit Ritland ◽  
Allyson Miscampbell ◽  
Annette Van Niejenhuis ◽  
Patti Brown ◽  
John Russell
Keyword(s):  
Mating System ◽  
Seed Orchard ◽  
Paternity Analysis ◽  
Thuja Plicata ◽  
Red Cedar ◽  
Management Schemes ◽  
Unbiased Estimates ◽  
Western Red Cedar ◽  
New Feature ◽  
Thuja Plicata Donn

We used microsatellite genetic markers to evaluate the mating system of western red cedar (Thuja plicata Donn ex D. Don) under various seed orchard pollen management schemes. We primarily examined whether supplemental mass pollination (SMP) can reduce the observed selfing rates. Pollen blowing and “hooding” were also examined in smaller tests. Only SMP was consistently effective in reducing the selfing rate, from 30% to 20%. The correlation of paternity was quite high (60%–90%) in two of three orchards, and in these two orchards the application of SMP reduced this correlation by about 10% as well. The correlation of paternity is the fraction of full-sibling vs. half-sibling progeny, and unbiased estimates can be obtained with few loci, even single loci, in contrast to other types of paternity analysis. We also find the microsatellite amplicon sizes should be pooled into “bins” of 2–4 nucleotides, owing to unintended errors of assay; otherwise the estimates are biased. This new feature of mating system estimation was incorporated into the computer program MLTR.

Equations for Estimating Browse Biomass of Red Huckleberry, Western Red-Cedar, and Deer Fern by Vertical Profile

1992 ◽  
Vol 7 (2) ◽  
pp. 48-50 ◽  
Author(s):  
Nicholas J. Smith ◽  
Alan McLeod
Keyword(s):  
Odocoileus Hemionus ◽  
Thuja Plicata ◽  
Regression Equations ◽  
Odocoileus Hemionus Columbianus ◽  
Height Profile ◽  
Winter Range ◽  
Red Cedar ◽  
Blechnum Spicant ◽  
Second Growth ◽  
Western Red Cedar

Abstract Edible biomass estimating regression equations were developed for red huckleberry (Vaccinium parvifolium), understory western red-cedar (Thuja plicata) and deer fern (Blechnum spicant) growing in potential second-growth Columbian black-tailed deer (Odocoileus hemionus columbianus) winter range on Vancouver Island, B.C. Vertical edible biomass height profile equations were also developed for red huckleberry and western red-cedar. These models may be used to objectively and conveniently help assess the amount of forage available to deer during severe winters. West. J. Appl. For. 7(2):48-50.

Light-growth response relationships in Pacific silver fir (Abies amabilis) and subalpine fir (Abies lasiocarpd)

1992 ◽  
Vol 70 (10) ◽  
pp. 1919-1930 ◽  
Author(s):  
K. Klinka ◽  
Q. Wang ◽  
G. J. Kayahara ◽  
R. E. Carter ◽  
B. A. Blackwell
Keyword(s):  
Growth Performance ◽  
Leaf Area ◽  
Specific Leaf Area ◽  
Shade Tolerance ◽  
High Elevation ◽  
Silver Fir ◽  
Subalpine Fir ◽  
Light Gradient ◽  
Advance Regeneration ◽  
Study Sites

Pacific silver fir and subalpine fir, both typically inhabiting high-elevation forests in northwestern North America, were considered shade-tolerant species, the former more tolerant than the latter. To determine their relative shade tolerance, established advance regeneration was sampled along a light gradient ranging from open areas to inside a forest stand, and analysis of irradiance, growth, and leaf measures was obtained. Relationships between the percentage of above-canopy light (in the photosynthetically active wavelengths) associated with each study tree and its 1991 height increment, 1991 lateral increment, caliper at the base of the 1991 leader, and specific leaf area were examined for individual sites, and sites were grouped according to soil moisture. There were strong, consistent, and similar relationships between irradiance, growth performance, and specific leaf area for both species. As irradiance decreased, growth performance decreased and specific leaf area increased. In spite of ecological differences between the study sites for each species, it was concluded that on fresh sites, Pacific silver fir and subalpine fir are very tolerant of shade. Both are equally well adapted to survive under high shade and snowpack by allocating more resources to caliper and lateral growth than to height growth and by increasing specific leaf area. Key words: shade tolerance, advance regeneration, irradiance, growth performance, specific leaf area, Pacific silver fir, subalpine fir.

Respiratory Tract Reactions to Western Red Cedar

1981 ◽  
Vol 1 (1) ◽  
pp. 41-51 ◽  
Author(s):  
A.D. Blainey ◽  
V.A.L. Graham ◽  
M.J. Phillips ◽  
R.J. Davies
Keyword(s):  
Respiratory Tract ◽  
Time Course ◽  
Thuja Plicata ◽  
Similar Time ◽  
Bronchial Challenge ◽  
Red Cedar ◽  
Western Red Cedar ◽  
The Uk ◽  
Dust Extract ◽  
Occupational Contact

1 Asthma due to western red cedar (Thuja plicata) is well recognized, but has not been described frequently in the UK. Two patients who developed asthma and rhinitis due to occupational contact with western red cedar were studied. Both patients developed late asthmatic responses following bronchial challenge with western red cedar. 2 The challenge technique and the results of comparison between different wood dusts and dust extract are described. 3 The technique of anterior rhinometry was used to follow the nasal response to challenge in one patient, and demonstrated a late nasal reaction which followed a similar time course to the bronchial response.

OCCURRENCE OF β-DOLABRIN (4-ISOPROPENYLTROPOLONE) IN WESTERN RED CEDAR (THUJA PLICATA DONN.)

1958 ◽  
Vol 36 (12) ◽  
pp. 1612-1615 ◽  
Author(s):  
J. A. F. Gardner ◽  
G. M. Barton
Keyword(s):  
Fractional Crystallization ◽  
Paper Chromatography ◽  
Sodium Salt ◽  
Volatile Oil ◽  
Thuja Plicata ◽  
Salt Precipitation ◽  
Red Cedar ◽  
Approximate Composition ◽  
Western Red Cedar ◽  
Thuja Plicata Donn

The steam-volatile oil of western red cedar contains traces of a fifth tropolone, β-dolabrin (4-isopropenyltropolone), in addition to α-, β-, and γ-thujaplicin and 7-hydroxy-4-isopropyltropolone. The presence of β-dolabrin, previously obtained from Japanese "Hiba" wood by Nozoe, was detected by paper chromatography and proved by isolation of a sample from the steam-volatile oil by a combination of sodium salt precipitation, fractional crystallization, and preparative paper chromatography. The approximate composition of the steam-volatile oil from butt heartwood is given.

Attraction of male Mayetiola thujae (Diptera: Cecidomyiidae) to the sex-pheromone blend of (2S,12S)-, (2S,13S)-, and (2S,14S)-diacetoxyheptadecane is reduced in the presence of the SR- or RR-stereoisomers

2007 ◽  
Vol 139 (5) ◽  
pp. 685-689
Author(s):  
Regine Gries ◽  
Robb G. Bennett ◽  
Grigori Khaskin ◽  
Gerhard Gries
Keyword(s):  
British Columbia ◽  
Sex Pheromone ◽  
Seed Orchard ◽  
Field Trapping ◽  
Thuja Plicata ◽  
Red Cedar ◽  
Synthetic Pheromone ◽  
Western Red Cedar ◽  
Sex Pheromone Blend ◽  
Pheromone Blend

AbstractIn a field trapping experiment in an abandoned seed orchard of western red-cedar, Thuja plicata Donn × D. Don, in British Columbia, we show that attraction of male red-cedar cone midges, Mayetiola thujae (Hedlin), to the pheromone blend (2S,12S)-, (2S,13S)-, and (2S,14S)-diacetoxyheptadecane is reduced in the presence of a blend of all other stereoisomers, or of the three SR- or RR-stereoisomers. The three RS-stereoisomers, in contrast, had no significant effect. Thus, synthetic pheromone for monitoring M. thujae populations must not contain the SR- or RR-stereoisomers of 2,12-, 2,13-, and 2,14-diacetoxyheptadecane. This result will allow development of a less expensive design for synthesizing the pheromone.

Lignans of western red cedar (Thuja plicata Donn). VII. Dihydroxythujaplicatin

1967 ◽  
Vol 45 (7) ◽  
pp. 739-740 ◽  
Author(s):  
Harold MacLean ◽  
B. F. MacDonald
Keyword(s):  
Hot Water ◽  
Thuja Plicata ◽  
Red Cedar ◽  
Degradation Studies ◽  
Western Red Cedar ◽  
Thuja Plicata Donn

The structure of a seventh lignan from the hot-water extractive of western red cedar, which was partially separated in a previous paper, has been determined as 2,3-dihydroxy-2-(3″,4″-dihydroxy-5″-methoxybenzyl)-3-(4′-hydroxy-3′-methoxybenzyl)-butyrolactone (I). This lignan is the fifth member of the thujaplicatin series and is trivially named dihydroxythujaplicatin. Methylation, ethylation, and degradation studies provide proof of structure by comparison with known compounds.

Sign in / Sign up

Export Citation Format

Share Document