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Creator:: DeBell, Dean S., Singleton, Ryan, Gartner, Barbara L., and Marshall, David D.
Abstract:: Breast-high stem sections were sampled from 56 western hemlock (Tsuga heterophylla (Raf.) Sarg.) trees growing in 15 plots representing a wide range of tree and site conditions in northwestern Oregon. Growth and wood density traits of individual rings were measured via X-ray densitometry, and relationships of ring density and its...
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Full Text:: , Barbara L. Gartner, and David D. Marshall Abstract: Breast-high stem sections were sampled from 56

Creator:: Marshall, David D., Johnson, Gregory P., and Hann, David W.
Abstract:: Crown profile equations were developed for stand-grown western hemlock (Tsuga heterophylla (Raf.) Sarg.) in northwest Oregon. The profile model uses a segmented approach, dividing the crown into an upper and lower portion at the point of the largest crown width (LCW). The model explains about 86% of the variation in...
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Full Text:: northwestern Oregon David D. Marshall, Gregory P. Johnson, and David W. Hann Abstract: Crown profile

Creator:: Hann, David W.
Abstract:: In their recent Canadian Journal of Forest Research Comment 368 article, Wilson and Oliver (2000) developed an equation for predicting the average ratio of height to diameter at breast height for the largest 250 trees/ha (H/DL250) in unthinned stands as a function of initial density and dominant height of the...
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Full Text:: -fir plantations1 David W. Hann Comment 368In their recentCanadian Journal of Forest Researcharti

Creator:: Needham, Mark D., Scott, David, and Vaske, Jerry J.
Abstract:: More than 40 years have passed since Shafer (1969) challenged the existence of the “average camper.” Recognizing that participants in recreation activities are heterogeneous in their commitments and interests, researchers have emphasized the importance of differentiating users into meaningful homogeneous subgroups. In his seminal article, Bryan (1977) coined the concept...
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Full Text:: Leisure Research Mark D. Needham 1 David Scott 2 Jerry J. Vaske 3

Creator:: Groom, Jeremiah D., Hann, David W., and Temesgen, Hailemariam
Abstract:: We examined the performance of several generalized linear fixed- and mixed-effects individual-tree mortality models for Douglas-fir stands in the Pacific Northwest. The mixed-effects models accounted for sampling and study design overdispersion. Inclusion of a random intercept term reduced model bias by 88% relative to the fixed-effects model; however, model discrimination...
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Full Text:: predicting Douglas-fir mortality 1 2 3 4 Jeremiah D. Groom 1 5 Department of Forest Engineering

Creator:: Tappeiner, John C., Huffman, David W. (William), 1962-, Marshall, David, Spies, Thomas A., and Bailey, John D.
Abstract:: We studied the ages and diameter growth rates of trees in former Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) old-growth stands on 10 sites and compared them with young-growth stands (50-70 years old, regenerated after timber harvest) in the Coast Range of western Oregon. The diameters and diameter growth rates for the...
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Full Text:: in coastal Oregon1 John C. Tappeiner, David Huffman, David Marshall, Thomas A. Spies, and John D

Creator:: Johnson, Daniel M., McCulloh, Katherine A., Woodruff, David R., and Meinzer, Frederick C.
Abstract:: Angiosperm and coniferous tree species utilize a continuum of hydraulic strategies. Hydraulic safety margins (defined as differences between naturally occurring xylem pressures and pressures that would cause hydraulic dysfunction, or differences between pressures resulting in loss of hydraulic function in adjacent organs (e.g., stems vs. leaves) tend to be much...
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Full Text:: embolism reversal in stems and leaves: Why are conifers and angiosperms so different? R H c D a b c

Creator:: Simard, Suzanne W., Molina, Randy, Smith, Jane E., Perry, David A., and Jones, Melanie D.
Abstract:: Seedlings of Pseudotsuga menziesii (Mirb.) Franco and Betula papyrifera Marsh. were grown in the greenhouse in monoculture and dual culture in soils collected from a young mixed species plantation in the southern interior of British Columbia. The objectives of the study were (i) to evaluate the ability of P. menziesii...
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Full Text:: , Randy Molina, Jane E. Smith, David A. Perry, and Melanie D. Jones Abstract: Seedlings of Pseudotsuga

Creator:: Eisenberg, Cristina, Seager, S. Trent, and Hibbs, David E.
Abstract:: Like most ecological communities, aspen (Populus tremuloides) forests are influenced by a synergy of bottom-up (resources-driven) and top-down (predator-driven) processes. Since the 1920s, ecologists have observed the decline of many aspen communities throughout the Intermountain West. The extent and possible drivers of this decline are topics of much recent scientific...
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Full Text:: , USA Ph: (541) 913-3998 e-mail: trent.seager@oregonstate.edu David E. Hibbs Department of

Creator:: Meigs, Garrett W., Campbell, John L., Zald, Harold S. J., Bailey, John D., Shaw, David C., and Kennedy, Robert E.
Abstract:: Although there is acute concern that insect-caused tree mortality increases the likelihood or severity of subsequent wildfire, previous studies have been mixed, with findings typically based on stand-scale simulations or individual events. This study investigates landscape- and regional-scale wildfire likelihood following outbreaks of the two most prevalent native insect pests...
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Full Text:: ,1 JOHN D. BAILEY,1 DAVID C. SHAW,1 AND ROBERT E. KENNEDY1,2 1College of Forestry, Oregon State

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