Influence of climate on annual changes in Douglas-fir stem taper

Trees ◽  
2022 ◽  
Author(s):  
D. A. Jones ◽  
C. A. Harrington ◽  
J. B. St. Clair
Keyword(s):  
Douglas Fir ◽  
Stem Taper ◽  
Annual Changes

scholarly journals Heritabilities, Intertrait Genetic Correlations, G x E Interaction and Predicted Genetic Gains for Acoustic Velocity in Mid-rotation Coastal Douglas fir

2011 ◽  
Vol 60 (1-6) ◽  
pp. 8-18 ◽  
Author(s):  
K. J. S. Jayawickrama ◽  
T. Z. Ye ◽  
G. T. Howe
Keyword(s):  
First Generation ◽  
Mixed Model ◽  
Genetic Correlations ◽  
Acoustic Velocity ◽  
Douglas Fir ◽  
Volume Index ◽  
Type B ◽  
The North ◽  
Stem Taper ◽  
Oregon Cascades

AbstractAcoustic velocity (AV) data from 7,423 coastal Douglas-fir trees drawn from 347 wind-pollinated families on 14 sites, from four first-generation testing programs in the north Oregon Cascades, were analyzed. Families were measured on two or four sites at ages 23 to 41 years from seed using the Fakopp TreeSonic standingtree tool. Height (HT) and DBH data collected at ages 15 and 16 from seed, from all trees in the four programs (95,795 trees, 955 families), were used to calculate volume index (VOL = HT*DBH2) and stem taper (TAP = DBH/HT). All traits were analyzed using multivariate mixed model analyses.Across-site individual narrow-sense heritabilities for AV2ranged from 0.24 to 0.40 among first-generation programs, compared to 0.12 to 0.23 for HT, 0.10 to 0.16 for DBH, 0.11 to 0.20 for VOL and 0.14 to 0.17 for TAP.Across-site type B correlations for AV2ranged from 0.85 to 0.95, compared to 0.62 to 0.83 for HT, 0.60 to 0.74 for DBH, 0.67 to 0.78 for VOL and 0.66 to 0.79 for TAP. AV2was negatively correlated with HT in three programs (rA= 0.17 to −0.28), and negatively correlated with DBH (−0.12 to −0.46), VOL (−0.05 to −0.44) and TAP (−0.09 to −0.40) in all four programs.Selecting the top 10% of the families sampled based on AV2gave predicted gains of 4.4% to 9.6% for AV2and −9.3% to 10.6% for VOL. The adverse genetic correlations between AV2and growth, and the losses in gain in AV2from selection based on growth, may be overestimated by suppression of slower-growing families in these older tests.

Effect of Armillaria root disease on quality and value of green Douglas-fir lumber

2010 ◽  
Vol 86 (2) ◽  
pp. 263-266 ◽  
Author(s):  
M G Cruickshank
Keyword(s):  
Tree Species ◽  
Wood Quality ◽  
Douglas Fir ◽  
Root Disease ◽  
Tree Level ◽  
Stem Taper ◽  
Negative Effect ◽  
Key Words Disease ◽  
Armillaria Root Disease ◽  
The Impact

For a few tree species, scattered accounts of impact caused by root disease exist in the literature mainly at the tree level. No product quality impacts have ever been measured or properly costed. To provide some information on value impacts, green rough-sawn Douglas-fir lumber was cut from trees with and without Armillaria root disease. This produced 80 boards from six trees in two planted stands. Fewer boards came from living diseased trees compared to healthy trees of similar diameter (1.3 m) at both sites, suggesting that disease may affect stem taper or form. Lumber from diseased trees was affected most often by warp and for healthy trees by knots, but warp affected value the most. Disease appears to have at best no effect, and at worst, a negative effect on lumber value but is not likely to increase value. This is the first report of the impact of a root disease on lumber quality and value, but further work would be required to properly assess this. Key words: disease, Armillaria root disease, conifer, Douglas-fir, wood quality, lumber warping, lumber value, lumber grading

Auswirkungen der Wertastung auf das Douglasien-Wachstum: Ergebnisse aus Nordwestdeutschland

2019 ◽  
Vol 170 (4) ◽  
pp. 207-215
Author(s):  
Andreas Weller
Keyword(s):  
Wood Quality ◽  
Tree Height ◽  
Douglas Fir ◽  
Control Group ◽  
Radial Increment ◽  
Lower Saxony ◽  
Branch Diameter ◽  
Stem Taper ◽  
Positive Effect ◽  
Forest District

Effects of pruning on the growth of Douglas-fir: findings from northwestern Germany Owing to Douglas-firs' insufficient self-pruning ability, for the production of high-grade wood, manual pruning is mandatory. Pruning of live branches increases the branch-free tree volume considerably. Branchiness is important for grading wood quality, but with pruning this detrimental characteristic loses its significance for the value of the Douglas-fir asset. In 1980, trials were conducted in the forest district of Ahlhorn (Lower Saxony, Germany) with three-year-old Douglas- firs to test the effects of live pruning on tree growth. The sample material consists of 93 trees which were periodically pruned beginning from a height of 6 to 8 m up to 20, 40 and 60% of tree height, as well as of 9 Douglas-firs of the unpruned control group. However, only specimens with a pruning height of 60% had live branches removed at each pruning. By means of a multivariate linear regression model the effects of pruning on the dependent variates diameter at breast height (dbh), tree height, stem taper of the butt log and maximum branch diameter approximately at a whorl's height of 5 m were studied up to the age of 39 years. Pruning of live branches had a significant effect on periodic radial growth as well as on bottom log allocation, though not on tree height or branch diameter. Live prune led to moderate reduction of radial increment and had a positive effect on stem taper. The results of the study largely agree with earlier studies on the effects of pruning on Douglas-fir growth.

Assessment of Carbon Stock and Uptake by Estimation of Stem Taper Equation for Pinus densiflora in Korea

2017 ◽  
Vol 8 (4) ◽  
pp. 415-424 ◽  
Author(s):  
Jin-Taek Kang ◽  
Yeong-Mo Son ◽  
Ju-Hyeon Jeon ◽  
Sun-Jeoung Lee
Keyword(s):  
Carbon Stock ◽  
Pinus Densiflora ◽  
Stem Taper ◽  
Taper Equation

UNIFICATION OF STANDS SELECTION FOR FINAL FELLING IN STRATEGIC AND TACTICAL PLANNING

2015 ◽  
Author(s):  
Ainārs GRĪNVALDS
Keyword(s):  
Strategic Planning ◽  
Net Present Value ◽  
Strategic Plan ◽  
Regression Function ◽  
Tactical Planning ◽  
Present Value ◽  
Black Alder ◽  
Value Maximization ◽  
Annual Changes ◽  
Selection For

The stand selection for cutting in tactical planning should be done according to the same principles like in strategic planning – to maximize net present value. The simple way of how to transfer the net present value maximization principle from strategic planning to tactical planning was created in Sweden. The method is based on annual changes in the net present value by postponing final felling. Forest inventory data and forestry modelling system was used for calculation of changes in net present value for pine, spruce, birch, aspen and black alder stands. And changes in net present value were described by regression function with factors from stand parameters. The regression function allows calculating annual changes in net present value for each stand. And stands with higher decrease in net present value have higher cutting priority. Stands selected for the final felling in strategic plan were compared with the stands selected in tactical plan with two methods, first, by using annual changes in the net present value, second, by traditional planning principles. Stands selected by annual changes in the net present value were similar to stands that were selected for cutting in strategic plan, but stands selected by traditional planning principles – not.

Catastrophic Stem Taper Wear in Ceramic on Polyethylene Bearing Couple: A Case Report

2014 ◽  
Vol 24 (2-3) ◽  
pp. 185-188 ◽  
Author(s):  
Atsushi Kusaba ◽  
Mariko Katsui ◽  
Naoyuki Hakuta ◽  
Masashi Tsuchida ◽  
Akihiko Maeda ◽  
...  
Keyword(s):  
Case Report ◽  
Stem Taper ◽  
Bearing Couple

The Estimation of Stem Volume for Pinus thunbergii by Coast using Kozak’s Stem Taper Model in Korea

2017 ◽  
Vol 29 (4) ◽  
pp. 225-244 ◽  
Author(s):  
Yeongmo Son ◽  
Jinteak Kang ◽  
Juhyeon Jeon ◽  
Chiung Ko
Keyword(s):  
Pinus Thunbergii ◽  
Stem Volume ◽  
Stem Taper ◽  
Taper Model
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