Modelling dominant height growth of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) in Portugal

Abstract Height-age and site-index curves were developed from stem analysis of 262 Douglas-fir trees (Pseudotsuga menziesii var. glauca) from 68 plots in the Interior Douglas-fir, Interior Cedar-Hemlock, and Sub-boreal Spruce Biogeoclimatic zones in the interior of British Columbia. Plots ranged in site index from about 8 to 30 m and in age from about 60 to 350 years; however, the analyses were limited to data up to 100 years of age. A conditioned logistic function was selected for predicting height, and a linear model was selected for predicting site index. The curves are similar to those developed in comparable studies in the Inland Empire, but differ substantially from curves developed in British Columbia from temporary sample plots. This study supports previous observations that the pattern of height growth for a given site index varies among ecologically different areas. West. J. Appl. For. 7(1):20-25.

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Modeling dominant height growth of maritime pine in Portugal using GADA methodology with parameters depending on soil and climate variables

Annals of Forest Science ◽

10.1007/s13595-011-0036-8 ◽

2011 ◽

Vol 68 (2) ◽

pp. 311-323 ◽

Cited By ~ 16

Author(s):

Luís Nunes ◽

Maria Patrício ◽

José Tomé ◽

Margarida Tomé

Keyword(s):

Height Growth ◽

Maritime Pine ◽

Climate Variables ◽

Dominant Height ◽

Dominant Height Growth

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Soil texture and other site-level factors differentially affect growth of Scotch broom (Cytisus scoparius) and Douglas-fir (Pseudotsuga menziesii) seedlings in the western Pacific Northwest

Canadian Journal of Forest Research ◽

10.1139/cjfr-2021-0011 ◽

2021 ◽

Author(s):

David Carter ◽

Robert A. Slesak ◽

Timothy B. Harrington ◽

Anthony W. D’Amato

Keyword(s):

Pacific Northwest ◽

Pseudotsuga Menziesii ◽

Height Growth ◽

Douglas Fir ◽

Western Pacific ◽

Limiting Factor ◽

Cytisus Scoparius ◽

Invasive Shrub ◽

Scotch Broom ◽

The Western Pacific

The invasive shrub Scotch broom (Cytisus scoparius (L.) Link) is a pervasive threat to regenerating Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco var. menziesii) stands in the Pacific Northwest, USA. Field observations indicate that the susceptibility of areas to Scotch broom invasion and dominance can vary by site. We selected ten sites throughout the western Pacific Northwest that spanned a gradient of soil textures and other factors to test the site-specific susceptibility of Douglas-fir to overtopping by Scotch broom. We expected to find that the ability of Scotch broom to dominate a site was mediated by site-level factors, particularly those influencing soil water – the most limiting factor to growth in the region. We found Scotch broom and Douglas-fir were inversely affected by site-level factors. In general, Douglas-fir absolute height growth rates were more competitive with those of Scotch broom on fine-textured soils than on more coarsely textured soils. We also found Douglas-fir to have a more dramatic response to increasing down woody material than Scotch broom. Scotch broom height growth approached an asymptote at 3 m. Sites with fast-growing Douglas-fir were able to surpass this height six to seven years after planting and appear likely to avoid suppression by Scotch broom.

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Comparison and Development of Height Growth and Site Index urves for Douglas-Fir in the Inland Northwest

Western Journal of Applied Forestry ◽

10.1093/wjaf/4.3.85 ◽

1989 ◽

Vol 4 (3) ◽

pp. 85-88

Author(s):

James L. Vander Ploeg ◽

James A. Moore

Keyword(s):

Pseudotsuga Menziesii ◽

Model Development ◽

Analysis Data ◽

Site Index ◽

Height Growth ◽

Douglas Fir ◽

Western Montana ◽

Stem Analysis ◽

Inland Northwest ◽

Central Idaho

Abstract Stem analysis data from Douglas-fir (Pseudotsuga menziesii) collected throughout the inland Northwest were used for testing height growth and site index equations. The equations performed well in northern and central Idaho, northeast Oregon, and northeast Washington on vegetative types similar to those sampled in model development. However, if the equations were applied on drier sites outside the original geographic study area, overestimates of height growth and under-estimates of site index could result. Therefore, revised height growth and site index equations are presented for western Montana and central Washington. West. J. Appl. For. 4(3):85-88, July 1989.

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Respective importance of ecological conditions and stand composition on Abies alba Mill. dominant height growth

Forest Ecology and Management ◽

10.1016/j.foreco.2007.09.031 ◽

2008 ◽

Vol 255 (3-4) ◽

pp. 619-629 ◽

Cited By ~ 24

Author(s):

Paulina E. Pinto ◽

Jean-Claude Gégout ◽

Jean-Christophe Hervé ◽

Jean-François Dhôte

Keyword(s):

Abies Alba ◽

Height Growth ◽

Ecological Conditions ◽

Dominant Height ◽

Dominant Height Growth

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HEIGHT GROWTH LOSSES DUE TO ANIMAL FEEDING IN DOUGLAS FIR PLANTATIONS, VANCOUVER ISLAND, B.C.

The Forestry Chronicle ◽

10.5558/tfc40298-3 ◽

1964 ◽

Vol 40 (3) ◽

pp. 298-307 ◽

Cited By ~ 3

Author(s):

K. J. Mitchell

Keyword(s):

Pseudotsuga Menziesii ◽

East Coast ◽

Growth Curves ◽

Tree Height ◽

Vancouver Island ◽

Height Growth ◽

Douglas Fir ◽

Average Height ◽

Animal Feeding ◽

Rotation Age

Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) plantations on the east coast of Vancouver Island, British Columbia, were examined to determine the effect of animal feeding upon height growth.Length of internodes and evidence of past leader damage were recorded and cumulative average height-age growth curves compared for undamaged trees and for trees suffering various intensities of damage.The average reduction in tree height attributable to animal feeding in heavily browsed plantations varied from one-half to two feet over a period of 8 to 10 years. It is unlikely that either tree volume or quality at rotation age would be seriously affected.Exposed trees were browsed more heavily than those protected by vegetation or logging slash.

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