Fifth-year responses of Douglas-fir to crowding and nonconiferous competition

1987 ◽  
Vol 17 (2) ◽  
pp. 181-186 ◽  
Author(s):  
Elizabeth C. Cole ◽  
Michael Newton
Keyword(s):  
Basal Area ◽  
Primary Objective ◽  
Douglas Fir ◽  
Coast Range ◽  
Growth Responses ◽  
Coastal Site ◽  
Red Alder ◽  
Oregon Coast Range ◽  
Management Alternatives ◽  
Site Types

Growth responses from crowding and interspecific competition were examined in 5-year-old plantations of Douglas-fir (Pseudotsugamenziesii (Mirb.) Franco var. menziesii) spaced 17 to 123 cm apart, alone or with either grass or red alder (Alnusrubra Bong.) on three site types in the Oregon Coast Range. Grass and red alder competition and crowding adversely affected growth and standing biomass on a per tree basis. Basal area per hectare and volume per hectare were higher at high densities but these relations are expected to change with time as the larger trees at low densities form fully stocked stands. Grass competition showed greatest effects on growth at the driest site. Although the presence of red alder decreased growth on all sites, the effect was most significant at the coastal site where light is most limiting and moisture is least limiting. If the production of maximum tree size is the primary objective, then low stocking with control of competing vegetation will produce larger trees faster than will other management alternatives.

Relationship Between Occurrence of Laminated Root Rot and Site Characteristics in Douglas-Fir Forests of the Northern Oregon Coast Range

1994 ◽  
Vol 9 (1) ◽  
pp. 14-17 ◽  
Author(s):  
Walter W. Kastner ◽  
Donald J. Goheen ◽  
Robert L. Edmonds
Keyword(s):  
Root Rot ◽  
Basal Area ◽  
Douglas Fir ◽  
Slope Position ◽  
Coast Range ◽  
Plant Association ◽  
Oregon Coast Range ◽  
Oregon Coast ◽  
Disease Occurrence ◽  
Site Characteristics

Abstract In the northern Oregon Coast Range 70- to 100-yr old Douglas-fir (Pseudotsuga menziesii) stands were evaluated to determine rate of infection by laminated root rot, caused by (Phellinus weirii), whether local disease occurrence was associated with site characteristics, and impacts of P. weirii on the number of trees and basal area. Overall infection rate was 5.6%, but varied from 0.0 to 14.7% among stands. There was a significant association between occurrence of P. weirii and slope position. The rate of infection on ridges, upper slopes, middle slopes, and lower slopes was 13.0, 7.3, 4.1, and 0.0%, respectively. Occurrence of P. weirii was independent of plant association and aspect. Infected plots contained 25% less live Douglas-fir basal area and 35% fewer live Douglas-fir trees per ac than uninfected plots. West. J. Appl. For. 9(1):14-17.

Responses of Red Alder to Thinning

1995 ◽  
Vol 10 (1) ◽  
pp. 17-23 ◽  
Author(s):  
David E. Hibbs ◽  
William H. Emmingham ◽  
Michael C. Bondi
Keyword(s):  
Basal Area ◽  
Height Growth ◽  
Diameter Growth ◽  
Alnus Rubra ◽  
Coast Range ◽  
Red Alder ◽  
Oregon Coast Range ◽  
Oregon Coast ◽  
Basal Area Growth ◽  
Area Growth

Abstract Responses of red alder (Alnus rubra Bong.) to thinning were observed at two sites in the Oregon Coast Range. Five years after thinning in the 20-yr-old stand, mortality was observed only in control plots. Diameter growth of crop trees increased up to 54% with thinning. Trends toward less height growth at wider spacings and increased growth in basal area compared to controls appeared to be developing in thinned plots. Ten years after thinning in the 14-yr-old stand, the problems of flashback seen at year 5 in the chemically thinned plots had largely been overcome. Reduction in height growth in all thinned plots had been overcome. Net basal area growth was up to 60% greater in thinned treatments. Thinning appears effective for 10 to 15 yr in the narrow spacings and 15 to 20 yr in the wide spacings. West. J. Appl. For. 10(1): 17-23.

Nutrient, moisture, and light relations in 5-year-old Douglas-fir plantations under variable competition

1986 ◽  
Vol 16 (4) ◽  
pp. 727-732 ◽  
Author(s):  
Elizabeth C. Cole ◽  
Michael Newton
Keyword(s):  
Nitrogen Concentration ◽  
Moisture Stress ◽  
Douglas Fir ◽  
Coast Range ◽  
Nitrogen And Phosphorus ◽  
Red Alder ◽  
Oregon Coast Range ◽  
Foliar Nitrogen ◽  
Foliar Phosphorus ◽  
Crown Closure

Competition for soil nutrients, moisture, and light was examined in 5-year-old plantations of young coastal Douglas-fir (Pseudotsugamenziesii (Mirb.) Franco var. menziesii) growing at 17- to 123-cm spacings, alone or with either of two competitors, grass (Elymus spp. and Agrostistenuis L.) or red alder (Alnusrubra Bong.), on three different site types in the Oregon Coast Range. Douglas-fir foliar nitrogen concentration and total and available soil nitrogen did not differ significantly by competitor species; however, foliar phosphorus was higher in the grass treatments. Both foliar nitrogen and phosphorus concentrations were significantly lower at high planting densities. Predawn moisture stress varied with site, competitor, and density, the lowest stresses occurring at low densities where Douglas-fir was growing alone. Canopy light penetration varied with competitor, density, and height above ground, the lowest values occurring under the red alder canopy. Grass competed with Douglas-fir seedlings primarily for moisture until crown closure eliminated the grass. Nodulated red alder did not increase soil or Douglas-fir foliar nitrogen on any site or at any density, but competition from red alder trees reduced available light and moisture for Douglas-fir. Regardless of competitor type, high density resulted in increased demands on resources.

Stand growth responses after fertilization for thinned lodgepole pine, Douglas-fir, and spruce in forests of interior British Columbia, Canada

2019 ◽  
Vol 49 (11) ◽  
pp. 1471-1482
Author(s):  
Woongsoon Jang ◽  
Bianca N.I. Eskelson ◽  
Louise de Montigny ◽  
Catherine A. Bealle Statland ◽  
Derek F. Sattler ◽  
...  
Keyword(s):  
British Columbia ◽  
Picea Glauca ◽  
Lodgepole Pine ◽  
Basal Area ◽  
Stand Density ◽  
Site Index ◽  
Douglas Fir ◽  
Picea Sitchensis ◽  
Growth And Yield ◽  
Growth Responses

This study was conducted to quantify growth responses of three major commercial conifer species (lodgepole pine (Pinus contorta Douglas ex Loudon var. latifolia Engelm. ex S. Watson), interior Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco var. glauca (Beissn.) Franco), and spruce (white spruce (Picea glauca (Moench) Voss) and hybrid spruce (Picea engelmannii Parry ex. Engelm. × Picea glauca (Moench) Voss × Picea sitchensis (Bong.) Carrière))) to various fertilizer blends in interior British Columbia, Canada. Over 25 years, growth-response data were repeatedly collected across 46 installations. The fertilizer blends were classified into three groups: nitrogen only; nitrogen and sulfur combined; and nitrogen, sulfur, and boron combined. The growth responses for stand volume, basal area, and top height were calculated through absolute and relative growth rate ratios relative to a controlled group. Fertilizer blend, inverse years since fertilization, site index, stand density at fertilization, and their interactions with the fertilizer blend were used as explanatory variables. The magnitude and significance of volume and basal area growth responses to fertilization differed by species, fertilizer-blend groups, and stand-condition variables (i.e., site index and stand density). In contrast, the response in top height growth did not differ among fertilization blends, with the exception of the nitrogen and sulfur fertilizer subgroup for lodgepole pine. The models developed in this study will be incorporated into the current growth and yield fertilization module (i.e., Table Interpolation Program for Stand Yields (TIPSY)), thereby supporting guidance of fertilization applications in interior forests in British Columbia.

scholarly journals Basal area growth, carbon isotope discrimination, and intrinsic water use efficiency after fertilization of Douglas-fir in the Oregon Coast Range

2017 ◽  
Vol 389 ◽  
pp. 285-295 ◽  
Author(s):  
Eladio H. Cornejo-Oviedo ◽  
Steven L. Voelker ◽  
Douglas B. Mainwaring ◽  
Douglas A. Maguire ◽  
Frederick C. Meinzer ◽  
...  
Keyword(s):  
Water Use Efficiency ◽  
Water Use ◽  
Carbon Isotope Discrimination ◽  
Basal Area ◽  
Coast Range ◽  
Oregon Coast Range ◽  
Oregon Coast ◽  
Intrinsic Water Use Efficiency ◽  
Area Growth ◽  
Use Efficiency

Correlations Between Overtopping Vegetation and Development of Douglas-Fir Saplings in the Oregon Coast Range

1987 ◽  
Vol 2 (4) ◽  
pp. 117-119 ◽  
Author(s):  
Samuel S. Chan ◽  
John D. Walstad
Keyword(s):  
Pseudotsuga Menziesii ◽  
Tree Height ◽  
Douglas Fir ◽  
Morphological Features ◽  
Diameter Growth ◽  
Coast Range ◽  
Oregon Coast Range ◽  
Oregon Coast ◽  
Sapling Growth ◽  
Stem Diameter Growth

Abstract The response of Douglas-fir (Pseudotsuga menziesii) saplings to overtopping vegetation on three northeast-facing sites in the Oregon Coast Range was studied for two years. As amount of overtopping brush increased, sapling growth (as indicated by size) generally decreased. Basal stem diameter growth was most reduced, but similar reductions in growth occurred for tree height and other morphological features. West. J. Appl. For. 2(4):117-119, October 1987.

scholarly journals Douglas-Fir Beetle Response to Artificial Creation of Down Wood in the Oregon Coast Range

2006 ◽  
Vol 21 (3) ◽  
pp. 117-122 ◽  
Author(s):  
Darrell W. Ross ◽  
Bruce B. Hostetler ◽  
John Johansen
Keyword(s):  
Tree Mortality ◽  
Large Diameter ◽  
Douglas Fir ◽  
Coast Range ◽  
Managed Forests ◽  
Oregon Coast Range ◽  
Oregon Coast ◽  
Management Objectives ◽  
Baited Traps ◽  
Before And After

Abstract Douglas-fir beetle populations were monitored before and after thinning and felling of trees to create down wood in an 88-year-old Douglas-fir plantation in the Oregon Coast Range. Treatments included an unthinned control, thinning to a target of 75 trees/ha, and thinning to a target of 150 trees/ha. Actual mean tree densities on the plots after thinning were 406, 102, and 154, for the control, 75 trees/ha, and 150 trees/ha treatments, respectively. Fifty trees/ha were felled and left on all thinned plots to create down wood for ecological values. Catches in pheromone-baited traps indicated that the local beetle population increased for 1 year in response to felling and leaving large diameter trees in partial shade. Douglas-fir beetle entrance holes and brood were significantly more abundant on the sides of felled trees and wood borers were significantly more abundant on the upper surface suggesting that treatments that provide maximum exposure of felled trees will create the least favorable habitat for Douglas-fir beetles. However, there were no differences in Douglas-fir beetle entrance holes or brood densities in felled trees between the two thinning intensities. Douglas-fir beetle-caused tree mortality was significantly higher on thinned plots with residual felled trees compared with unthinned controls, although infestation levels were low on all plots (<2 trees/ha). The small increase in beetle-caused tree mortality associated with leaving felled trees would be unlikely to interfere with resource management objectives. These results are applicable to mature, managed forests west of the Cascades with relatively low Douglas-fir beetle populations. In different regions and stand types, or under different environmental conditions, beetle populations could increase to higher densities, remain at high densities longer, and cause higher levels of tree mortality. West. J. Appl. For. 21(3):117–122.

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