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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...
Resource Type:: Article
Full Text:: northwestern Oregon David D. Marshall, Gregory P. Johnson, and David W. Hann Abstract: Crown profile

Creator:: Johnson, G. R., Wheeler, N. C., and Strauss, S. H.
Abstract:: The land area required for a marker-aided selection (MAS) program to break-even (i.e., have equal costs and benefits) was estimated using computer simulation for coastal Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) in the Pacific Northwestern United States. We compared the selection efficiency obtained when using an index that included the phenotype...
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Full Text:: -fir G.R. Johnson, N.C. Wheeler, and S.H. Strauss Abstract: The land area required for a marker-aided

Creator:: Homann, Peter S., Caldwell, Bruce A., Chappell, H. N., Sollins, Phillip, and Swanston, Chris W.
Abstract:: Chemical and microbial soil properties were assessed in paired unfertilized and urea fertilized (>89 g N·m–2) plots in 13 second-growth Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) stands distributed throughout western Washington and Oregon. A decade following the termination of fertilization, fertilized plots averaged 28% higher total N in the O layer...
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Full Text:: forest-management practices that change soil C stores (Johnson 1992a), which may be important in terres

Creator:: Gartner, Barbara L., North, Eric M., Johnson, G. R., and Singleton, Ryan
Abstract:: It would be valuable economically to know what are the biological triggers for formation of mature wood (currently of high value) and (or) what maintains production of juvenile wood (currently of low value), to develop silvicultural regimes that control the relative production of the two types of wood. Foresters commonly...
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Full Text:: density and growth in Douglas-fir Barbara L. Gartner, Eric M. North, G.R. Johnson, and Ryan Singleton

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:: Lee, E. Henry, Beedlow, Peter A., Waschmann, Ronald S., Burdick, Connie A., and Shaw, David C.
Abstract:: Swiss needle cast (SNC), an important fungal disease of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco), has increased in severity throughout its natural and introduced range over the last half century. The role of climate change and forest management practices in the increase is unclear. We analyzed tree-ring chronologies from six late-successional...
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Full Text:: . Burdick, and David C. Shaw Abstract: Swiss needle cast (SNC), an important fungal disease of Douglas-fir

Creator:: Huffman, David W. (William), 1962- and Tappeiner, John C.
Abstract:: Seedling regeneration and morphology of Oregon grape (Berberis nervosa Pursh) and salal (Gaultheria shallon Pursh) were studied in thinned and unthinned Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) stands in the central Coast Range, Oregon. Above- and below-ground growth of both species were significantly and negatively correlated with stand density. Oregon grape...
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Full Text:: shallon)1 David W. Huffman and John C. Tappeiner II Abstract: Seedling regeneration and morphology of

Creator:: Gartner, Barbara L. and Johnson, G. R.
Abstract:: Stem sinuosity is a highly visible stem-form trait in the leaders of fast-growing Douglas-fir (Pseudotsuga menziesii var. (Mirb.) Franco) trees, yet its cause is unknown. We tested the hypotheses that sinuous stems have longer expanses of primary growth than nonsinuous stems (putting the leader at higher risk curvature, induction of...
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Full Text:: in Douglas-fir? Barbara L. Gartner and G.R. Johnson Abstract: Stem sinuosity is a highly visible

Creator:: Swanston, Christopher W. and Myrold, David Douglas
Abstract:: Nitrogen incorporation from red alder (Alnus rubra Bong.) into an Oregon upland mesic forest soil was studied by tracing the fate of 15N added as 15N-labeled alder leaf litter. The recovery of 15N in vegetation, litter, light- and heavy-fractions of the soil, the chloroform-labile (microbial biomass) pool, and the whole...
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Full Text:: plants and soil of a recent clearcut in Oregon1 Christopher W. Swanston and David D. Myrold Abstract

Creator:: Hann, David W. and Hanus, Mark L.
Abstract:: Two nonspatial approaches for modeling tree crown recession (ΔHCB) were evaluated by using 5341 observations from Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco). The first approach applies a static height-to-crown-base (HCB) equation at the start and end of the growth period and uses the difference in these predictions as an estimate of...
Resource Type:: Article
Full Text:: predict tree crown recession David W. Hann and Mark L. Hanus Abstract: Two nonspatial approaches for

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