Between- and Within-Tree Variation in the Anatomy and Specific Gravity of Wood in Oregon White Oak (Quercus Garryana Dougl.)

IAWA Journal ◽  
1996 ◽  
Vol 17 (4) ◽  
pp. 445-461 ◽  
Author(s):  
Hua Lei ◽  
Michael R. Milota ◽  
Barbara L. Gartner
Keyword(s):  
Specific Gravity ◽  
Pseudotsuga Menziesii ◽  
Fibre Length ◽  
Wood Properties ◽  
Vessel Diameter ◽  
Coast Range ◽  
Quercus Garryana ◽  
White Oak ◽  
Earlywood Vessel ◽  
Oregon White Oak

In order to analyze the variation in wood properties within and between trees of an underutilized tree species, we sampled six Oregon white oak (Quercus garryana Dougl.) trees from an 80-year old mixed stand of Q. garryana and Douglas-fir (Pseudotsuga menziesii [Mirb.] Franco) in the Coast Range of Western Oregon, USA. Fibre length, earlywood vessel diameter, tissue proportions, and specific gravity were measured on samples across the diameter at two heights. Trees had a slight lean (2-12°), so we sampled separately both radii of a diametric strip that ran from the lower to upper side of lean.

scholarly journals Stand Structure and Composition Affect the Drought Sensitivity of Oregon White Oak (Quercus garryana Douglas ex Hook.) and Douglas-Fir (Pseudotsuga menziesii (Mirb.) Franco)

Forests ◽  
2019 ◽  
Vol 10 (5) ◽  
pp. 381 ◽  
Author(s):  
Ze’ev Gedalof ◽  
Jennifer Franks
Keyword(s):  
Pseudotsuga Menziesii ◽  
Environmental Changes ◽  
Stand Structure ◽  
Mixed Forest ◽  
Douglas Fir ◽  
Quercus Garryana ◽  
White Oak ◽  
Canopy Position ◽  
Oregon White Oak ◽  
Species Specific

Due to a suite of environmental changes, Oregon white oak (Quercus garryana Douglas ex Hook; called Gary oak in Canada) associated ecosystems at many North American sites are being encroached upon by Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco var. menziesii) and other conifer species. Alteration of stand structure and composition is causing substantial changes in the dynamics of these ecosystems, creating an environment in which Oregon white oak is not thriving. In this study we used dendrochronology to investigate the competitive dynamics between Oregon white oak and Douglas-fir in a mixed forest stand on Southern Vancouver Island. Significant species-specific differences in radial growth sensitivity to drought were found between Oregon white oak and Douglas-fir. Oregon white oak trees growing at high densities, or competing with Douglas-fir for moisture were found to be more sensitive to drought and more sensitive to growing conditions during the prior year. The response of Douglas-fir to drought was less variable, possibly due to the relatively low conifer densities at our study site, as well as the species’ ability to root graft, its higher shade tolerance than Oregon white oak, and its rapid growth rates that allow it to achieve a more dominant canopy position. The non-stationary response to climate exhibited by Oregon white oak provides insights into the mechanisms by which Oregon white oak savannas are being converted to coniferous woodland, but also suggest that tree-ring reconstructions of climate need to explicitly address changes in stand dynamics that could influence the growth–climate relationship

A Multi-Proxy Environmental Narrative of Oregon White Oak (Quercus garryana) Habitat in the Willamette Valley, Oregon

2017 ◽  
Vol 91 (2) ◽  
pp. 160-185 ◽  
Author(s):  
Kelsey Copes-Gerbitz ◽  
Karen Arabas ◽  
Evan Larson ◽  
Stevie Gildehaus
Keyword(s):  
Willamette Valley ◽  
Quercus Garryana ◽  
White Oak ◽  
Oregon White Oak

scholarly journals Growth of Oregon White Oak (Quercus garryana)

2011 ◽  
Vol 85 (2) ◽  
pp. 159-171 ◽  
Author(s):  
Peter J. Gould ◽  
Constance A. Harrington ◽  
Warren D. Devine
Keyword(s):  
Quercus Garryana ◽  
White Oak ◽  
Oregon White Oak

Changes in Oregon white oak (Quercus garryana Dougl. ex Hook.) following release from overtopping conifers

Trees ◽  
2006 ◽  
Vol 20 (6) ◽  
pp. 747-756 ◽  
Author(s):  
Warren D. Devine ◽  
Constance A. Harrington
Keyword(s):  
Quercus Garryana ◽  
White Oak ◽  
Oregon White Oak

Post-Planting Treatments Increase Growth of Oregon White Oak (Quercus garryana Dougl. ex Hook.) Seedlings

2007 ◽  
Vol 15 (2) ◽  
pp. 212-222 ◽  
Author(s):  
Warren D. Devine ◽  
Constance A. Harrington ◽  
Lathrop P. Leonard
Keyword(s):  
Quercus Garryana ◽  
White Oak ◽  
Oregon White Oak

scholarly journals Prediction of Growth and Mortality of Oregon White Oak in the Pacific Northwest

2008 ◽  
Vol 23 (1) ◽  
pp. 26-33 ◽  
Author(s):  
Peter J. Gould ◽  
David D. Marshall ◽  
Constance A. Harrington
Keyword(s):  
Pacific Northwest ◽  
Development Model ◽  
Diameter Growth ◽  
Stand Development ◽  
Quercus Garryana ◽  
White Oak ◽  
Silvicultural Treatments ◽  
The Pacific ◽  
Oregon White Oak ◽  
Forest Managers

Abstract We developed new equations to predict Oregon white oak (Quercus garryana Dougl. ex Hook.) development within ORGANON, a stand-development model that is widely used in the Pacific Northwest. Tree size, competitive status, crown ratio, and site productivity were statistically significant predictors of growth and mortality. Three scenarios were projected with the new equations, the previous ORGANON model, and the Forest Vegetation Simulator. Compared with the two other models, the new equations predicted greater diameter growth in oak woodland and a greater effect of conifer removal in a conifer-oak stand. The new equations, which are based on considerably more information than previous equations, should give forest managers greater confidence in the ability of ORGANON to estimate the impacts of silvicultural treatments on oaks.

Raw Material Quality of Short-Rotation, Intensively Cultured Populus Clones. II. Wood and Bark from First-Rotation Stems and Stems Grown from Coppice

IAWA Journal ◽  
1987 ◽  
Vol 8 (2) ◽  
pp. 182-186
Author(s):  
J.E. Phelps ◽  
J.G. Isebrands ◽  
R.M. Teclaw
Keyword(s):  
Specific Gravity ◽  
Fibre Length ◽  
Wood Properties ◽  
Raw Material ◽  
Short Rotation ◽  
Growth System ◽  
Basal Portion ◽  
Dormant Season ◽  
Hybrid Clones

The coppicing ability of Populus hybrid clones after dormant season harvesting is weil suited to a short-rotation, intensively cultured (SRIC) growth system. stems formed from coppice exhibit a greater amount of growth than first-rotation trees during the juvenile stage. This research examines and compares properties, including specific gravity and fibre length of the wood and bark, of 3-year-old firstrotation stems (from cuttings) and 3-year-old coppiced stems of three hybrid Populus clones grown und er SRIC. Trees produced from coppiced stumps were 1.5 to 2.5 times larger (in height and diameter at the base) than first-rotation trees after 3 years of growth. Some of the wood properties of the first-rotation trees differed from those of the coppiced trees. For example, wood specific gravity was higher and wood fibres were longer in the sampies removed from the basal portion of the first-rotation trees. Although significant, these differences were small and not important from an industrial standpoint. The increase in woody biom ass after coppicing is likely to be more important to industry than any decreases in wood properties expected during short-rotation, intensive culture of Populus trees.

Oak mistletoe (Phoradendron villosum) is linked to microhabitat availability and avian diversity in Oregon white oak (Quercus garryana) woodlands

Botany ◽  
2017 ◽  
Vol 95 (3) ◽  
pp. 283-294 ◽  
Author(s):  
Kyle R. Pritchard ◽  
Joan C. Hagar ◽  
David C. Shaw
Keyword(s):  
Bird Species ◽  
Positive Association ◽  
Structural Heterogeneity ◽  
Wildlife Habitat ◽  
Avian Species ◽  
Important Food ◽  
Quercus Garryana ◽  
White Oak ◽  
Species Of Conservation Concern ◽  
Oregon White Oak

Mistletoes are parasitic or hemiparasitic flowering plants that parasitize woody plants around the globe. Important food and cover resources provided by mistletoes have been related to strong patterns of positive association between wildlife diversity and mistletoe density. Mistletoes also create microhabitat features known to be important to wildlife by causing deformations in their host trees. However, links between availability of mistletoe-formed microhabitat and wildlife diversity has not been well-studied. We investigated this relationship by quantifying microhabitat features and avian abundance and diversity related to infection by oak mistletoe (Phoradendron villosum (Nutt.) Nutt. ex Engelm.) in Oregon white oak (Quercus garryana Douglas ex Hook.). Quercus garryana woodlands support several avian species of conservation concern, so understanding the influence of mistletoe on wildlife habitat is critical. Our results suggest that (i) structural heterogeneity within tree crowns is positively associated with mistletoe load; (ii) avian species richness and abundance are positively associated with mistletoe load; and (iii) the fruit of P. villosum is an important food for Western Bluebird (Sialia mexicana) and other wildlife in late autumn and early winter. If a goal of restoration is to maintain habitat for oak-associated bird species, managers should consider the retention of some oaks hosting mistletoe.

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