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Articles de revues sur le sujet « Douglas fir. Forest products »

Auteur : Grafiati

Publié le 4 juin 2021

Mis à jour le 1 février 2022

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1

Littke, K. M., T. B. Harrington, S. M. Holub, W. R. Littke, R. B. Harrison, and E. C. Turnblom. "Douglas-Fir Biomass Allocation and Net Nutrient Pools 15–20 Years after Organic Matter Removal and Vegetation Control." Forests 11, no. 9 (2020): 1022. http://dx.doi.org/10.3390/f11091022.

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Douglas-fir (Pseudotsuga menziesiivar. menziesii (Mirbel) Franco) plantation forests of the coastal Pacific Northwest have been intensively managed to improve the yield of forest products. However, the long-term effects of these management techniques have received limited research attention in this region. Three affiliate Long-Term Soil Productivity study sites were installed in Douglas-fir forests to understand the impacts of organic matter removals and vegetation control on soil productivity over time. Matlock and Fall River are located in Washington, USA and Molalla is located in Oregon. Or

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Diaz, David, Sara Loreno, Gregory Ettl, and Brent Davies. "Tradeoffs in Timber, Carbon, and Cash Flow under Alternative Management Systems for Douglas-Fir in the Pacific Northwest." Forests 9, no. 8 (2018): 447. http://dx.doi.org/10.3390/f9080447.

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Forest management choices offer significant potential to mitigate global climate change and biodiversity loss. To illuminate tradeoffs relevant to policymakers, forest sector stakeholders, and consumers of forest products, we utilize three Key Performance Indicators—average carbon storage in the forest and wood products; cumulative timber output; and discounted cash flow—to compare four alternative management scenarios for Douglas-fir forests on 64 parcels across western Oregon and Washington. These scenarios are designed to meet one of two alternative management objectives: (i) maximize Net P

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Widmer, F., B. T. Shaffer, L. A. Porteous, and R. J. Seidler. "Analysis of nifH Gene Pool Complexity in Soil and Litter at a Douglas Fir Forest Site in the Oregon Cascade Mountain Range." Applied and Environmental Microbiology 65, no. 2 (1999): 374–80. http://dx.doi.org/10.1128/aem.65.2.374-380.1999.

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ABSTRACT Nitrogen-fixing microbial populations in a Douglas fir forest on the western slope of the Oregon Cascade Mountain Range were analyzed. The complexity of the nifH gene pool (nifH is the marker gene which encodes nitrogenase reductase) was assessed by performing nested PCR with bulk DNA extracted from plant litter and soil. The restriction fragment length polymorphisms (RFLPs) of PCR products obtained from litter were reproducibly different than the RFLPs of PCR products obtained from the underlying soil. The characteristic differences were found during the entire sampling period betwee

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Harmon, Mark E., and Barbara Marks. "Effects of silvicultural practices on carbon stores in Douglas-fir western hemlock forests in the Pacific Northwest, U.S.A.: results from a simulation model." Canadian Journal of Forest Research 32, no. 5 (2002): 863–77. http://dx.doi.org/10.1139/x01-216.

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We used a new model, STANDCARB, to examine effects of various treatments on carbon (C) pools in the Pacific Northwest forest sector. Simulation experiments, with five replicates of each treatment, were used to investigate the effects of initial conditions, tree establishment rates, rotation length, tree utilization level, and slash burning on ecosystem and forest products C stores. The forest examined was typical of the Cascades of Oregon and dominated by Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) and western hemlock (Tsuga heterophylla (Raf.) Sarg). Simulations were run until a C stea

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Lefsky, M. A., W. B. Cohen, and T. A. Spies. "An evaluation of alternate remote sensing products for forest inventory, monitoring, and mapping of Douglas-fir forests in western Oregon." Canadian Journal of Forest Research 31, no. 1 (2001): 78–87. http://dx.doi.org/10.1139/x00-142.

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This research evaluates the utility of several remote sensing data types for the purpose of mapping forest structure and related attributes at a regional scale. Several sensors were evaluated, including (i) single date Landsat Thematic Mapper (TM); (ii) multitemporal Landsat TM; (iii) Airborne Data Acquisition and Registration (ADAR), a sensor with high spatial resolution; (iv) Airborne Visible-Infrared Imaging Spectrometer (AVIRIS), a sensor with high spectral resolution; and (v) Scanning Lidar Imager Of Canopies By Echo Recovery (SLICER), a lidar sensor that directly measures the height and

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Amarasinghe, Vindhya, and John E. Carlson. "The development of microsatellite DNA markers for genetic analysis in Douglas-fir." Canadian Journal of Forest Research 32, no. 11 (2002): 1904–15. http://dx.doi.org/10.1139/x02-110.

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The microsatellite motifs AG, AC, and ATG were found to be the most abundant in Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) and several other conifer tree species among di-, tri-, and tetra-nucleotide simple sequence repeats (SSR). Colonies containing AG, AC, and ATG repeats were selected from enriched genomic libraries of Douglas-fir, and 603 were sequenced. Polymerase chain reaction (PCR) primers were designed from flanking sequences in 102 of the SSR clones, of which 50 primer pairs (for 10 AC-repeat microsatellites and 40 AG-repeat microsatellites) produced robust amplification prod

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Babrauskas, Vytenis. "Effective heat of combustion for flaming combustion of conifers." Canadian Journal of Forest Research 36, no. 3 (2006): 659–63. http://dx.doi.org/10.1139/x05-253.

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The heat of combustion of burning trees is often used in forest-fire hazard modeling to relate mass-loss results to the heat produced; therefore reliable values are needed. Experimental results for the effective heat of combustion of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) trees are presented as a function of moisture content. It is also shown that during a forest fire, the effective heat of combustion does not correspond to the oxygen-bomb-test value. Instead, the value will always be lower, since the heat of combustion of char is higher than that of the pyrolysate vapors, and char

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Nabuurs, G. J., and G. M. J. Mohren. "Carbon in Dutch forest ecosystems." Netherlands Journal of Agricultural Science 41, no. 4 (1993): 309–26. http://dx.doi.org/10.18174/njas.v41i4.637.

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Present stock of carbon in living biomass, litter and stable humus and annual accumulation of carbon in stems of 15 forest types was quantified from inventory data on growth and standing volume, and forest soil information in combination with literature data on forest biomass, as part of the Dutch National Research Programme on Global Air Pollution and Climate Change. Forest area in the Netherlands is about 330 000 ha, mainly young plantations of conifers (Scots pine, Douglas-fir, larch) on poor, dry sandy soils. Average age is about 50 yr. Present average standing volume is 170 msuperscript 3

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Koumbi-Mounanga, Thierry, Tony Ung, Kevin Groves, Brigitte Leblon, and Paul Cooper. "Moisture and surface quality sensing of Douglas-fir (Pseudotsuga menziesii var. menziesii) veneer products." Forestry Chronicle 89, no. 05 (2013): 646–53. http://dx.doi.org/10.5558/tfc2013-116.

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The potential of near-infrared spectroscopy (NIRS) to estimate moisture content (MC) and surface inactivation parameters of Douglas-fir (Pseudotsuga menziesii var. menziesii) veneer products was assessed. The best prediction model for MC was produced for the lower range of MC (0%–50%) of Douglas-fir veneers. Exposure at 180°C produced surface colour changes and the CIE-L*a*b* colour parameters measuring colour changes were better estimated using the 400 nm to 900 nm spectral data than the 1100 nm to 2400 nm spectral data. Increased exposure time resulted in lower wettability and hence increasi

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Seale, R. Dan, Rubin Shmulsky, and Frederico Jose Nistal Franca. "Non-Destructive Lumber and Engineered Pine Products Research in the Gulf South U.S. 2005–2020." Forests 12, no. 1 (2021): 91. http://dx.doi.org/10.3390/f12010091.

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This review primarily describes nondestructive evaluation (NDE) work at Mississippi State University during the 2005–2020 time interval. Overall, NDE is becoming increasingly important as a means of maximizing and optimizing the value (economic, engineering, utilitarian, etc.) of every tree that comes from the forest. For the most part, it focuses on southern pine structural lumber, but other species such as red pine, spruce, Douglas fir, red oak, and white oak and other products such as engineered composites, mass timber, non-structural lumber, and others are included where appropriate. Much

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Kaupp, W. J., and P. M. Ebling. "EFFECT OF MECHANICAL PROCESSING AND LONG-TERM STORAGE ON BIOLOGICAL ACTIVITY OF VIRTUSS." Canadian Entomologist 125, no. 5 (1993): 975–77. http://dx.doi.org/10.4039/ent125975-5.

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The effect of long-term storage on the activity of biological control products, particularly those containing nuclear polyhedrosis viruses (NPVs), has not been extensively studied. Most investigations involving viral insecticides have dealt with their thermal stability (Stuermer and Bullock 1968; Dulmage and Burgerjohn 1977; McLeod et al. 1977; Ignoffo and Couch 1981). Freeze-dried and air-dried powdered preparations of gypsy moth, Lymantria dispar L., NPV show little reduction in potency after storage at 4°C for 10 months and 3 months, respectively. Consequently, it was recommended that gypsy

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Livingston, N. J., and T. A. Black. "The growth and water use of three species of conifer seedlings planted on a high-elevation south-facing clearcut." Canadian Journal of Forest Research 18, no. 10 (1988): 1234–42. http://dx.doi.org/10.1139/x88-190.

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Container-grown 1-0 seedlings of Douglas-fir (Pseudotsugamenziesii (Mirb.) Franco), western hemlock (Tsugaheterophylla (Raf.) Sarg.), and Pacific silver fir (Abiesamabilis (Dougl.) Forbes) were spring planted on a south-facing high-elevation clearcut located on Mount Arrowsmith, Vancouver Island, British Columbia, and their growth and development was measured over three successive growing seasons. Treatments designed to modify seedling microclimate, including provision of shade cards, irrigation, and irrigation and shade cards combined, had a marked effect on the extent and type of growth in a

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Cooper, P. A., D. Jeremic, S. Radivojevic, Y. T. Ung, and B. Leblon. "Potential of near-infrared spectroscopy to characterize wood products1This article is a contribution to the series The Role of Sensors in the New Forest Products Industry and Bioeconomy." Canadian Journal of Forest Research 41, no. 11 (2011): 2150–57. http://dx.doi.org/10.1139/x11-088.

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Near infrared spectroscopy (NIRS) has high potential as a rapid nondestructive approach to identifying wood species and estimating properties that affect their utilization. This study found that NIRS could differentiate certain wood species groups. True firs (balsam fir ( Abies balsamea (L.) Mill.) and subalpine fir ( Abies lasiocarpa (Hook.) Nutt.)) could be distinguished from pine and spruce in eastern and western spruce–pine–fir, respectively, more than 95% of the time. Western hemlock ( Tsuga heterophylla (Raf.) Sarg.) could be differentiated from amabilis fir ( Abies amabilis Douglas ex J

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Filip, Gregory M., Craig L. Schmitt, and Catherine G. Parks. "Mortality of Mixed-Conifer Regeneration Surrounding Stumps Infected by Heterobasidion annosum 15–19 Years after Harvesting in Northeastern Oregon." Western Journal of Applied Forestry 15, no. 4 (2000): 189–94. http://dx.doi.org/10.1093/wjaf/15.4.189.

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Abstract In 1989, a high frequency (89%) of Heterobasidion annosum, cause of annosus root disease, was found in true fir stumps cut 5 to 9 yr earlier in northeastern Oregon. Despite high stump infection levels, mortality of surrounding regeneration was very low (1.4%) in 1989 and even lower (0.7%) in 1999. High-elevation mixed-conifer stands in northeastern Oregon are often overstocked with regeneration. This regen-eration often includes H. annosum-susceptible species such as grand fir and subalpine fir and H. annosum-tolerant species such as Douglas-fir, Engelmann spruce, and western larch. T

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Crotteau, Justin S., and Christopher R. Keyes. "Restoration Treatments Improve Overstory Tree Resistance Attributes and Growth in a Ponderosa Pine/Douglas-Fir Forest." Forests 11, no. 5 (2020): 574. http://dx.doi.org/10.3390/f11050574.

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Research Highlights: This study provides much needed insight into the development of resistance to disturbance and growth dynamics of overstory trees in response to restoration-based fuel reduction, and will be useful to scientists and managers attempting to better grasp the relative merits of restoration treatment types. Background and Objectives: Restoration-based fuel reduction treatments are common in dry, fire-prone forests of the western United States. The primary objective of such treatments is to immediately reduce a stand’s crown fire hazard. However, the impact of these treatments on

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Osborne, Nathaniel L., and Douglas A. Maguire. "Modeling knot geometry from branch angles in Douglas-fir (Pseudotsuga menziesii)." Canadian Journal of Forest Research 46, no. 2 (2016): 215–24. http://dx.doi.org/10.1139/cjfr-2015-0145.

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Lumber and veneer recovery from Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) trees depend on the size and distribution of knots. Two approaches have been used to simulate the effect of knots on recovery of these products: (i) prediction of recovery based on mill studies and (ii) simulated milling of virtual trees. A benefit of the latter approach is that different milling configurations may be tested. Knots in virtual logs are usually based on data from X-ray scanning. A novel approach was used in this study to model knot geometry by inferring the development of a branch knot over time f

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Vikram, Vikas, Marilyn L. Cherry, David Briggs, Daniel W. Cress, Robert Evans, and Glenn T. Howe. "Stiffness of Douglas-fir lumber: effects of wood properties and genetics." Canadian Journal of Forest Research 41, no. 6 (2011): 1160–73. http://dx.doi.org/10.1139/x11-039.

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Because stiffness (modulus of elasticity (MOE)) is important for structural wood products, breeders and silviculturists seek to efficiently measure and improve this trait. We studied MOE in a 25-year-old progeny test of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) using field-based tools (ST300 and HM200) to measure stress wave MOE of standing trees and logs. We measured density, static bending MOE, and transverse vibration MOE on 2 × 4s, and density, SilviScan MOE, and SilviScan microfibril angle on small clearwood samples. Bending MOE had moderate to strong phenotypic and genetic corre

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Jacobs, Douglass F., Diane L. Haase, and Robin Rose. "Growth and Foliar Nutrition of Douglas-Fir Seedlings Provided with Supplemental Polymer-Coated Fertilizer." Western Journal of Applied Forestry 20, no. 1 (2005): 58–63. http://dx.doi.org/10.1093/wjaf/20.1.58.

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Abstract Polymer-coated fertilizer (PCF) provides a potential means to optimize nutrient delivery for plant uptake, while minimizing leaching. Coating technology varies by manufacturer, which may alter patterns of nutrient release over time among comparable products. Three months following sowing, Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) seedlings were transplanted into containers with Osmocote Plus (OS) (15-9-12) and Apex (AP) (16-5-9) PCF (each with 5–6 month longevity) applied at four rates (0, 600, 1200, and 1800 mg total N per seedling) as a supplement to periodic addition of co

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Runde, Douglas E., Dale L. Nolte, Wendy M. Arjo, and William C. Pitt. "Efficacy of Individual Barriers to Prevent Damage to Douglas-Fir Seedlings by Captive Mountain Beavers." Western Journal of Applied Forestry 23, no. 2 (2008): 99–105. http://dx.doi.org/10.1093/wjaf/23.2.99.

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Abstract We tested the ability of individual tree seedling protectors to deter mountain beavers from damaging Douglas-fir seedlings. Using captive mountain beavers in field pens, we tested 20 products representative of a wide range of barriers suitable for protecting individual tree seedlings from rodent damage. Eleven products protected 95% or more of seedlings from damage. Tree shelters and fabric shelters provided the most protection; 98 and 95% of seedlings were undamaged, respectively. Rigid mesh protector tubes protected 81% of seedlings, and protection netting protected 55% of seedlings

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Creamer, Selmin F., Alan Genz, and Keith A. Blatner. "The Effect of Fire Risk on the Critical Harvesting Times for Pacific Northwest Douglas-Fir When Carbon Price Is Stochastic." Agricultural and Resource Economics Review 41, no. 3 (2012): 313–26. http://dx.doi.org/10.1017/s1068280500001283.

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The forest owner's decision regarding when to harvest, based on forest's current worth, is analyzed using the real options approach for a representative Pacific Northwest Douglas-fir stand when the carbon price is stochastic and there is a fire risk. The problem is framed as a linear complementarity problem and solved using the fully implicit finite difference method combined with a penalty method. The fire risk results in lower option values and earlier critical harvesting times, whereas a wider carbon price range ($0–$100 versus $0–$10) produces contrary results and more responsiveness to th

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Shahi, Chander K., and Shashi Kant. "Cointegrating relationship and the degree of market integration among the North American softwood lumber product markets." Canadian Journal of Forest Research 39, no. 11 (2009): 2129–37. http://dx.doi.org/10.1139/x09-110.

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Studies in spatial market integration of the North American softwood lumber products have mostly focused on the question of whether prices in distinct market locations are cointegrated or not. However, the informational deficiencies in market integration studies were fulfilled in this analysis by examining a continuum of the degree of market integration rather than using the dichotomous approach whereby markets are deemed either integrated or not. Firstly, the methodology of permanent–transitory decomposition in a multivariate vector error correction model was used to estimate the cointegratin

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Filip, Gregory M., Craig L. Schmitt, and Kristen L. Chadwick. "Incidence of Heterobasidion annosum in Mixed-Conifer Natural Regeneration Surrounding Large True Fir Stumps 20–25 Years after Harvesting in Northeastern Oregon." Western Journal of Applied Forestry 21, no. 4 (2006): 178–84. http://dx.doi.org/10.1093/wjaf/21.4.178.

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Abstract High-elevation true fir stands on federal lands have a long history of selective harvesting. In 1989 a high frequency (89%) of Heterobasidion annosum, the cause of annosus root disease, was found in residual true fir stumps (mean, 20-in. diameter) cut 5–9 years earlier in northeast Oregon. In 2004, H. annosum was found at the stump surface of 29% of the natural conifer regeneration (mean, 18 years) within 20 ft of infected residual stumps. A total of 16 of 122 (13%) live saplings had H. annosum–caused stain or decay. Only 3% of 126 sample trees, however, were dead and infected by H. a

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Bailey, J. D., and L. H. Liegel. "Response of Pacific Yew (Taxus brevifolia) to Partial Removal of the Overstory." Western Journal of Applied Forestry 12, no. 2 (1997): 41–43. http://dx.doi.org/10.1093/wjaf/12.2.41.

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Abstract Growth response of Pacific yew (Taxus brevifolia) to canopy disturbance or partial removal is undocumented. Ten year radial increment growth was determined from cores of yew stems in adjacent intact and partially harvested stands of Douglas-fir (Pseudotsuga menziesii) in the central Oregon Cascades. The harvested stand had approximately half of its overstory trees removed in 1978. In the intact stand, 10 yr growth increment after 1978 averaged 0.9 mm less than the pre-1978 increment; in the partially harvested stand, the post-1978 10 yr increment averaged 4.7 mm more than the earlier

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Lindsay, Amanda, Paul Oester, and Elizabeth Cole. "Twenty-Year Response of Ponderosa Pine (Pinus ponderosa Laws.) to Treatment with Hexazinone in Northeastern Oregon." Western Journal of Applied Forestry 24, no. 3 (2009): 151–56. http://dx.doi.org/10.1093/wjaf/24.3.151.

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Abstract Chemical control of competing vegetation with hexazinone is a common and effective silvicultural treatment for ensuring ponderosa pine (Pinus ponderosa Laws.) plantation success on dry sites in the western United States, yet few studies document the effect for more than the first few years after planting. This study, re-evaluated 20 years after planting, followed ponderosa pine growth and survival when hexazinone was applied in broadcast and spot treatments for control of competing vegetation. We continued work from the first 5 years after establishment that identified early differenc

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Prestemon, Jeffrey P., and Joseph Buongiorno. "The impacts of NAFTA on U.S. and Canadian forest product exports to Mexico." Canadian Journal of Forest Research 26, no. 5 (1996): 794–809. http://dx.doi.org/10.1139/x26-089.

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The North American Free Trade Agreement (NAFTA) will lower barriers to trade and investment across the continent. This paper presents predictions of the effects of NAFTA on Mexico's imports of intermediate wood products, scrap and waste paper, pulp, and newsprint from the United States and Canada. Predictions were made with a partial equilibrium model. Model development involved estimating (i) elasticities of Mexico's import demand with respect to price and demand shifters and (ii) elasticities of prices with respect to their determinants, and then predicting, with these elasticities, the impa

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Morgenstern, Kristin, Jens-Ulrich Polster, Birgit Reiche, Patrick Schützel, Imke Hutter, and Doris Krabel. "Role of Phytopathogenic Fungi in Forest Plant Breeding–Development of DNA-Based Quick Tests for Quality Assurance in Forest Plant Production." Environmental Sciences Proceedings 3, no. 1 (2020): 96. http://dx.doi.org/10.3390/iecf2020-07898.

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The production of healthy seed and plant material is a fundamental prerequisite for the establishment of ecologically stable and economically productive forest stands. As in the past, forest plant production is nevertheless threatened by harmful biotic factors, with new, invasive species playing an increasingly significant role as a result of climate change and globalization. DNA-based methods have significantly accelerated the detection of plant pathogens, but are still time-consuming, costly, and require extensive equipment. Loop-mediated isothermal amplification (LAMP) is an efficient and c

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Zhou, Shuai, Brennan Pecha, Michiel van Kuppevelt, Armando G. McDonald, and Manuel Garcia-Perez. "Slow and fast pyrolysis of Douglas-fir lignin: Importance of liquid-intermediate formation on the distribution of products." Biomass and Bioenergy 66 (July 2014): 398–409. http://dx.doi.org/10.1016/j.biombioe.2014.03.064.

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Cunningham, J. C., and K. van Frankenhuyzen. "Microbial insecticides in forestry." Forestry Chronicle 67, no. 5 (1991): 473–80. http://dx.doi.org/10.5558/tfc67473-5.

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Research has been conducted in Canada on bacteria, viruses, protozoa, fungi and nematodes for control of forest insect pests. Environmental concerns regarding the use of synthetic chemical pesticides have resulted in increased use of the only microbial control agent that is commercially available, the bacterium Bacillus thuringiensis (B.t.). There are currently 18 B.t. products registered for forestry use in Canada. The greatest use of B.t. has been for control of spruce budworm, Choristoneura Jumiferana, although it has been extensively used on several other species of defoliating lepidoptero

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Han, Han-Sup, E. M. (Ted) Bilek, John (Rusty) Dramm, Dan Loeffler, and Dave Calkin. "Financial Feasibility of a Log Sort Yard Handling Small-Diameter Logs: A Preliminary Study." Western Journal of Applied Forestry 26, no. 4 (2011): 174–82. http://dx.doi.org/10.1093/wjaf/26.4.174.

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Abstract The value and use of the trees removed in fuel reduction thinning and restoration treatments could be enhanced if the wood were effectively evaluated and sorted for quality and highest value before delivery to the next manufacturing destination. This article summarizes a preliminary financial feasibility analysis of a log sort yard that would serve as a log market to buy and sell small-diameter logs in western Montana. We based our evaluations on equipment for a medium-sized log sort yard that would preprocess and sort 33 million board feet of small-diameter logs per year to seven dif

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Duriot, Robin, Guillaume Pot, Stéphane Girardon, et al. "New Perspectives for LVL Manufacturing from Wood of Heterogeneous Quality—Part. 1: Veneer Mechanical Grading Based on Online Local Wood Fiber Orientation Measurement." Forests 12, no. 9 (2021): 1264. http://dx.doi.org/10.3390/f12091264.

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The grading of wood veneers according to their true mechanical potential is an important issue in the peeling industry. Unlike in the sawmilling industry, this activity does not currently estimate the local properties of production. The potential of the tracheid effect, which enables local fiber orientation measurement, has been widely documented for sawn products. A measuring instrument exploiting this technology and implemented on a peeling line was developed, enabling us to obtain the fiber orientation locally which, together with global density, allowed us to model the local elastic proper

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Tschopp, Tobias, Rolf Holderegger, and Kurt Bollmann. "Auswirkungen der Douglasie auf die Waldbiodiversität." Schweizerische Zeitschrift fur Forstwesen 166, no. 1 (2015): 9–15. http://dx.doi.org/10.3188/szf.2015.0009.

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Effects of Douglas fir on forest biodiversity Under climate change, forestry in Switzerland promotes the increased cultivation of exotic Douglas fir (Pseudotsuga menziesii), as Douglas fir is more drought-resistant than native spruce. However, nature conservation organisations fear that enhanced planting of Douglas fir will negatively affect biodiversity and that Douglas fir has invasive potential. Based on the existing scientific and grey literature, we compile the present knowledge on the effects on forest habitats and biodiversity and the invasiveness of Douglas fir in Central Europe. The c

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Hawkins, Ashley E., and Terry W. Henkel. "Native forest pathogens facilitate persistence of Douglas-fir in old-growth forests of northwestern California." Canadian Journal of Forest Research 41, no. 6 (2011): 1256–66. http://dx.doi.org/10.1139/x11-053.

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Forest pathogens and insects can accelerate tree mortality, increase stand structural heterogeneity, and alter tree community composition. In northern California, the canopy trees Abies concolor var. lowiana (Gord. & Glend.) Lemmon (white fir) and Pseudotsuga menziesii var. menziesii (Mirbel) Franco (Douglas-fir) co-occur but vary in shade tolerance and regenerative abilities following disturbance. Field observations suggested that mortality and turnover of white fir exceeded that of Douglas-fir and that native pathogens may be important drivers in the absence of fire. Pathogens and bark b

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Thomas, K. D., and C. E. Prescott. "Nitrogen availability in forest floors of three tree species on the same site: the role of litter quality." Canadian Journal of Forest Research 30, no. 11 (2000): 1698–706. http://dx.doi.org/10.1139/x00-101.

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Forest floor samples from a 25-year-old plantation of three tree species (Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco), lodgepole pine (Pinus contorta Dougl. var. latifolia Engelm.), and paper birch (Betula papyrifera Marsh.)) growing on the same site were incubated (aerobically) in the laboratory for 29 days. Rates of N mineralization in the forest floors of Douglas-fir (165.1 µg/g) was significantly greater than either birch (72.9 µg/g) or lodgepole pine (51.2 µg/g). Douglas-fir forest floors also had the highest N concentration, lowest C/N ratio, and highest NH4-N concentrations, foll

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Edmonds, R. L., and H. N. Chappell. "Relationships between soil organic matter and forest productivity in western Oregon and Washington." Canadian Journal of Forest Research 24, no. 6 (1994): 1101–6. http://dx.doi.org/10.1139/x94-146.

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Mineral soil and forest floor C and N contents were determined in 154 Douglas-fir (Pseudotsugamenziesii (Mirb.) Franco) and western hemlock (Tsugaheterophylla (Raf.) Sarg.) stands in western Oregon and Washington ranging in age from 16 to 64 years. Relationships between site index and mineral soil and forest floor C, N, and C/N ratios were examined. Douglas-fir data were analyzed by geographic province (Puget Sound, Washington Cascades, Oregon Cascades, coastal Washington, coastal Oregon, and southwest Oregon). Average mineral soil C in Douglas-fir stands ranged from 102 Mg/ha to 177 Mg/ha in

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Bušina, F. "Natural regeneration of Douglas fir (Pseudotsuga menziesii [Mirb.] Franco) in forest stands of Hurky Training Forest District, Higher Forestry School and Secondary Forestry School in Pisek." Journal of Forest Science 53, No. 1 (2008): 20–34. http://dx.doi.org/10.17221/2083-jfs.

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Possibilities are assessed of the natural regeneration of Douglas fir under conditions of Hůrky Training Forest District, Higher Forestry School and Secondary Forestry School in Písek, in stand 12C7, forest type 3K5. The stand is situated at an altitude of 430 m above sea level in an area with mean annual temperature 7.3-7.5&degC and mean annual total precipitation 550-575 mm. Under the stand dominated by Douglas fir (65 years of age), natural regeneration of the mean density of 53,800 seedlings/ha appeared due to lateral light coming from the north. The highest density of Douglas fir natu

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Kantor, P., and R. Mareš. "Production potential of Douglas fir in acid sites of Hůrky Training Forest District, Secondary Forestry School in Písek." Journal of Forest Science 55, No. 7 (2009): 312–22. http://dx.doi.org/10.17221/2/2009-jfs.

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The study is a follow-up of the production potential of Douglas fir in mesotrophic sites of the Křtiny Training Forest Enterprise (TFE) (Journal of Forest Science, No. 7, 2008). Production parameters (height, dbh, volume) of Douglas fir are also evaluated, but in acid sites of the Hůrky Training Forest District, Secondary Forestry School in Písek in mature stands. In total, 17 mixed stands with the proportion of Douglas fir aged 88 to 121 years were assessed. Comparing 10 Douglas fir trees with 10 Norway spruce, Scots pine or European larch trees of the largest volume, higher and generally mar

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Drewitt, G. B., T. A. Black, Z. Nesic, et al. "Measuring forest floor CO2 fluxes in a Douglas-fir forest." Agricultural and Forest Meteorology 110, no. 4 (2002): 299–317. http://dx.doi.org/10.1016/s0168-1923(01)00294-5.

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Kantor, P. "Production potential of Douglas fir at mesotrophic sites of Křtiny Training Forest Enterprise." Journal of Forest Science 54, No. 7 (2008): 321–32. http://dx.doi.org/10.17221/35/2008-jfs.

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: The study evaluates production parameters (height, diameter at breast height, volume) of Douglas fir (<I>Pseudotsuga menziesii</I> [Mirb.] Franco) at mesotrophic sites of the Křtiny Training Forest Enterprise in mature stands. In total, 29 mixed stands were assessed with the registered proportion of Douglas fir at an age of 85 to 136 years. Comparing the 10 largest Douglas firs with the 10 largest spruces or larches higher, and as a rule markedly higher, production potential of introduced Douglas fir was found in all assessed stands. There were also groups of trees where the volu

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Kupka, I., V. Podrázský, and J. Kubeček. "Soil-forming effect of Douglas fir at lower altitudes – a case study." Journal of Forest Science 59, No. 9 (2013): 345–51. http://dx.doi.org/10.17221/27/2013-jfs.

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Forest ecosystem and in particular forest soil biodiversity and stability could be jeopardised by the impropriate tree species composition. Douglas fir is a species which has a high potential in Europe both from economic and biodiversity aspects of forest management. A more detailed analysis of Douglas fir effects on the humus forms and forest soil under different conditions is needed to evaluate the future use of this species in central European forests. The study plots cover acid sites with natural hardwood, spruce monoculture and Douglas fir stands. The soil analysis proved favourable effec

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Hanberry, Brice B., Donald C. Justice, and David C. Powell. "Discovering Douglas-Fir Woodlands in the Historical Forests of Umatilla National Forest, Eastern Oregon and Washington." Forests 11, no. 10 (2020): 1122. http://dx.doi.org/10.3390/f11101122.

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We discovered unique Douglas-fir open woodlands in the Umatilla National Forest using historical surveys. Historical ponderosa pine forests of the western United States are transitioning to denser forests comprised of a greater proportion of fire-sensitive species, including true firs. We used historical (1879 to 1887) surveys to quantify the composition and structure of the Umatilla National Forest in eastern Oregon and Washington and provided contemporary forest information for comparison. We also modeled fir and pine distributions using environmental predictors and the random forests and ex

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Negrón, José, Ann Lynch, Willis Schaupp, and Javier Mercado. "Douglas-Fir Tussock Moth- and Douglas-Fir Beetle-Caused Mortality in a Ponderosa Pine/Douglas-Fir Forest in the Colorado Front Range, USA." Forests 5, no. 12 (2014): 3131–46. http://dx.doi.org/10.3390/f5123131.

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Dale, Virginia H., Miles Hemstrom, and Jerry Franklin. "Modeling the long-term effects of disturbances on forest succession, Olympic Peninsula, Washington." Canadian Journal of Forest Research 16, no. 1 (1986): 56–67. http://dx.doi.org/10.1139/x86-010.

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A model of forest development has been adapted for the Pacific Northwest. The regeneration, growth, and death of individual trees are tracked for simulated 0.2 ha plots and tree attributes are aggregated to provide stand measures. The model includes the influence of temperature, soil moisture, light tolerance, and competition on tree growth. Long-term simulations for Douglas-fir dominated forests on the western Olympic Peninsula show that the stand is eventually dominated by western hemlock with silver fir being codominant. Even after 1200 years of subsequent stand development, silver fir fail

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Bindewald, Anja, and Hans-Gerhard Michiels. "Invasivität der Douglasie in Südwestdeutschland: Waldinventurdaten erlauben eine Einschätzung." Schweizerische Zeitschrift fur Forstwesen 169, no. 2 (2018): 86–92. http://dx.doi.org/10.3188/szf.2018.0086.

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Invasiveness of Douglas fir in south-western Germany: an assessment based on forest inventory data Douglas fir (Pseudotsuga menziesii [Mirb.] Franco) is the most significant tree species of non-native origin in south-western Germany from a commercial point of view. Its importance is expected to increase in the effort to adapt forests to climate change because Douglas fir is considered to be more drought-resistant than, for instance, Norway spruce. Currently, the use of Douglas fir in silviculture and the assessment of its invasiveness are controversially discussed between representatives of na

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Minore, Don. "Effects of sowing depth on emergence and growth of Douglas-fir, western hemlock, and noble fir seedlings." Canadian Journal of Forest Research 15, no. 5 (1985): 935–40. http://dx.doi.org/10.1139/x85-150.

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The effects of sowing depth of seeds of several western forest tree species were studied in greenhouse experiments. Emergence and seedling weight of Douglas-fir (Pseudotsugamenziesii (Mirb.) Franco), western hemlock (Tsugaheterophylla (Raf.) Sarg.), and noble fir (Abiesprocera Rehd.) were reduced by sowing seeds in soil at depths greater than 1 cm. Deep sowing in a peat–vermiculite mixture also reduced the emergence of Douglas-fir and western hemlock, but increased the hypocotyl diameters and weights of Douglas-fir seedlings.

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Hajnal-Jafari, Timea, Simonida Đurić, Dragana Stamenov, Verica Vasić, and Davorka Hackenberger. "Microbial Activity in Forest Soil Under Beech, Spruce, Douglas Fir and Fir." Contemporary Agriculture 65, no. 1-2 (2016): 33–38. http://dx.doi.org/10.1515/contagri-2016-0006.

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Summary The aim of this research was to investigate the microbial activity in forest soil from different sites under deciduous and coniferous trees in Serbia. One site on Stara planina was under beech trees (Fagus sp.) while another under mixture of spruce (Picea sp.) and Douglas fir (Pseudotsuga sp.). The site on Kopaonik was under mixture of beech (Fagus sp.) and spruce (Picea sp.) trees. The site on Tara was dominantly under fir (Abies sp.), beech (Fagus sp.) and spruce (Picea sp.). The total number of bacteria, the number of actinobacteria, fungi and microorganisms involved in N and C cycl

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McCreary, DD, DP Lavender, and RK Hermann. "Predicted global warming and Douglas-fir chilling requirements." Annales des Sciences Forestières 47, no. 4 (1990): 325–30. http://dx.doi.org/10.1051/forest:19900404.

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Podrázský, V., R. Čermák, D. Zahradník, and J. Kouba. "Production of Douglas-Fir in the Czech Republic based on national forest inventory data." Journal of Forest Science 59, No. 10 (2013): 398–404. http://dx.doi.org/10.17221/48/2013-jfs.

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This article summarizes basic estimates of productivity and trend analysis of one of the principal introduced forest tree species in the Czech Republic, i.e. Douglas-fir (Pseudotsuga menziesii [Mirbel] Franco). As a comparison, we also examine grand fir (Abies grandis [D. Don] Lindl), northern red oak (Quercus rubra L. syn. Quercus borealis Michx.) and black locust (Robinia pseudoacacia L). This paper presents estimates of forest land area, standing volume, annual and total increments, distribution of age classes, average ages and site indexes for the period 1979&ndash;2010. All data were

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Kostic, Olga, Miroslava Mitrovic, and Pavle Pavlovic. "Douglas fir impact on the dynamics and composition of humus in the soil of indigenous beech forest in western Serbia." Zbornik Matice srpske za prirodne nauke, no. 138 (2020): 83–95. http://dx.doi.org/10.2298/zmspn2038083k.

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This study investigates the impact of organic matter from Douglas fir (Pseudotsuga menziesii [Mirb.] Franco) on the amount and composition of humus in acid brown soil in a climatoregional beech forest (Fagetum moesiacae montanum B. Jov. 1967 s.l.) on Mt. Maljen. To accomplish this objective, we performed a one-year litterbag decomposition experiment with litterfall from Fagus moesiaca and Pseudotsuga menziesii. The quantitative and qualitative content of humus and the intensity of the decomposition process of organic mat?ter from beech and Douglas fir were analysed. Less humus was found during

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Kriegel, Peter, Dragan Matevski, and Andreas Schuldt. "Monoculture and mixture-planting of non-native Douglas fir alters species composition, but promotes the diversity of ground beetles in a temperate forest system." Biodiversity and Conservation 30, no. 5 (2021): 1479–99. http://dx.doi.org/10.1007/s10531-021-02155-1.

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AbstractPlanting non-native tree species, like Douglas fir in temperate European forest systems, is encouraged to mitigate effects of climate change. However, Douglas fir monocultures often revealed negative effects on forest biota, while effects of mixtures with native tree species on forest ecosystems are less well understood. We investigated effects of three tree species (Douglas fir, Norway spruce, native European beech), on ground beetles in temperate forests of Germany. Beetles were sampled in monocultures of each tree species and broadleaf-conifer mixtures with pitfall traps, and enviro

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Whitlock, Cathy, Christy E. Briles, Matias C. Fernandez, and Joshua Gage. "Holocene vegetation, fire and climate history of the Sawtooth Range, central Idaho, USA." Quaternary Research 75, no. 1 (2011): 114–24. http://dx.doi.org/10.1016/j.yqres.2010.08.013.

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AbstractThe paucity of low- and middle-elevation paleoecologic records in the Northern Rocky Mountains limits our ability to assess current environmental change in light of past conditions. A 10,500-yr-long vegetation, fire and climate history from Lower Decker Lake in the Sawtooth Range provides information from a new region. Initial forests dominated by pine and Douglas-fir were replaced by open Douglas-fir forest at 8420 cal yr BP, marking the onset of warmer conditions than present. Presence of closed Douglas-fir forest between 6000 and 2650 cal yr BP suggests heightened summer drought in

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