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Thèses 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

Wilson, Jeremy Stuart. "Wind stability of naturally regenerated and planted Douglas-fir stands in coastal Washington, Oregon, and British Columbia /." Thesis, Connect to this title online; UW restricted, 1998. http://hdl.handle.net/1773/5472.

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2

Littell, Jeremy Scott. "Climate impacts to forest ecosystem processes : Douglas-fir growth in northwestern U.S. mountain landscapes and area burned by wildfire in western U.S. ecoprovinces /." Thesis, Connect to this title online; UW restricted, 2006. http://hdl.handle.net/1773/5559.

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3

Zustovic, Matthew. "Forest canopy gap size affects regeneration potential of interior Douglas-fir." Thesis, University of British Columbia, 2015. http://hdl.handle.net/2429/55426.

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There is growing concern about the long term productivity of forests in British Columbia due to changing climatic conditions. Interior Douglas-fir, an economically and culturally valuable conifer species, has recently had inconsistent regeneration success in the dry climatic regions of its distribution due to high summer soil surface temperatures, drought and growing season frost. Seeds of interior Douglas-fir germinate after mixed severity disturbances, but their survival appears to depend on the size of disturbance gaps, environmental resources and conditions, and colonization by mycorrhizal

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4

Haffenden, Austin. "Model forest system : even-aged Douglas fir plantation with invasive Rhododendron." Thesis, Keele University, 2015. http://eprints.keele.ac.uk/2349/.

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This thesis investigated the ecology and dynamics of Douglas fir (Pseudotsuga menziesii var. menziesii) dominated plantations at Coed-y-Brenin, Wales, whose transformation to continuous cover forestry has been delayed due to the presence of non-native invasive rhododendron (Rhododendron ponticum L). The literature review highlighted the complementary evolution of silviculture and modelling concepts to meet societal expectations and advance knowledge and understanding. It highlighted the development of hybrid, individual-based models, facilitated by advances in technology and complex systems th

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5

Kabzems, Richard Darwin. "Quantitative classification of soil nutrient regimes of some mesothermal Douglas-fir ecosystems." Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/24691.

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Previous attempts to classify nutrient regimes of forest soil have been qualitative evaluations utilizing vegetation and/or physiographic site characteristics, morphological soil properties, and parent material. The major objective of this study was to describe and classify the soil nutrient regimes (SNR) of some Pseudotsuga menziesii ecosystems on southern Vancouver Island, British Columbia. The order of increasing variability for forest floor properties was pH(H₂0) <TC <TN <TS <TP <exMg <exCa <exK <exMn <minN. The order of increasing variability for mineral soil properties was pH(H₂0)=pH(Ca

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6

Klinka, Karel, R. E. (Reid E. ). Carter, Qingli Wang, and M. C. (Michael Charles) Feller. "Influence of salal on height growth of coastal douglas-fir." Forest Sciences Department, University of British Columbia, 2001. http://hdl.handle.net/2429/677.

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The influence of salal on tree growth has attained considerable attention in coastal British Columbia. Field observations, surveys, and studies in the CWH zone have indicated poor growth performance of crop tree species in salal-dominated plantations and natural immature and old-growth stands. Where sites have been burned and planted, tree growth has improved; similar effects have been observed for naturally regenerated stands. Immature stands that developed after wind disturbance or harvesting feature rapid growth and nearly complete absence of salal. As studies have shown that ericaceous pla

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7

Kelliher, Francis Maurice. "Salal understory removal effects on the soil water regime and tree transpiration rates in a Douglas-fir forest." Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/25825.

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Salal (Gaultheria shallon Pursh.) understory in a 800 tree/ha 31-year-old Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) stand was cut and removed from around one of each of four pairs of adjacent trees, the root zones of which were isolated using plastic sheeting buried to bedrock. The differences in the courses of the average root zone soil water content (Φ) during the growing season were small (maximum difference = 0.03 m³ m⁻³ ) because total evapotranspiration was only slightly higher where salal was present than where it had been removed. Porometer and lysimeter measurements on select

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8

Swetnam, Thomas W. "Radial Growth Losses in Douglas-Fir and White Fir Caused by Western Spruce Budworm in Northern New Mexico: 1700-1983." Laboratory of Tree-Ring Research, University of Arizona (Tucson, AZ), 1985. http://hdl.handle.net/10150/302602.

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Final Report / Contract on 43-8371-4-628 / For: USDA, Forest Service, Southwestern Region<br>Regional outbreaks of western spruce budworms (Choristoneura occidentalis Freeman) have recurred at least three times in northern New Mexico since the early 1920's when the U. S. Forest Service first began systematic forest-pest surveys and documentation (Lessard 1975, U. S. Forest Service documents). The current outbreak was first noticed in a small area on the Taos Indian Reservation in 1974, and since then the defoliated areas have increased in New Mexico and Arizona to more than 370,000 acres of F

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9

Vitali, Valentina [Verfasser], Jürgen [Akademischer Betreuer] Bauhus, and Ulf [Akademischer Betreuer] Büntgen. ""Drought tolerance of Douglas-fir, Norway spruce and Silver fir in the Black Forest region – a dendrochronological analysis"." Freiburg : Universität, 2017. http://d-nb.info/1154385736/34.

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10

Davis, Geralyn Daphane. "Relationships between foliar nutrient status of second growth Douglas-fir and forest floor chemical properties." Thesis, University of British Columbia, 1987. http://hdl.handle.net/2429/26241.

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The objective of this study was to examine the relationships between Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) foliar nutrient status and forest floor chemical properties. Foliar nutrient analysis data were collected on 27, 50- to 140-year-old Douglas-fir stands, for which the forest floor chemical properties had previously been analysed. The 27 sites encompassed a broad geographical area within the Coastal Western Hemlock Biogeoclimatic Zone. Foliar samples were individually analysed for total S, N, P, K, Ca, Mg, B, Cu, Zn, Fe, Al, Mn and for AFe (active iron). Four foliar nutrient

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11

Klinka, Karel, Paul Bernardy, and Christine Chourmouzis. "A comparison of Grand fir and Douglas-fir growth performance in the Elk River Tree Farm." Forest Sciences Department, University of British Columbia, 1998. http://hdl.handle.net/2429/681.

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The superior growth of Grand fir (Abies grandis) compared to Douglas-fir (Pseudostuga menziesii) on suitable coastal sites has previously been recognized on the basis of qualitative observations with little empirical evidence. For example, D.E. McMullan (1977, pers. comm.) reported 18% higher volume for a grand fir tree of the same height and age as a 108-year old Douglas-fir plus tree (No. 622) This study was undertaken by Bernardy (1988) to examine possible differences in the growth of grand fir and Douglas-fir growing in a mixed 40-year-old plantation of unknown origin. Trends in height,

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12

Burgoyne, Tricia A. "Free living nitrogen-fixation in ponderosa pine/Douglas-fir forests of western Montana." Connect to this title online, 2007. http://etd.lib.umt.edu/theses/available/etd-05302007-085002/.

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13

Bixby, Mitchell. "Interception in Open-grown Douglas-fir (Pseudotsuga menziesii) Urban Canopy." PDXScholar, 2011. https://pdxscholar.library.pdx.edu/open_access_etds/37.

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I hypothesized that Douglas-fir trees (Pseudotsuga menziesii) standing apart from other trees ('open-grown') will intercept more rainfall than Douglas-fir trees standing near other trees ('closed-canopy'). Open-grown trees differ structurally and are more common in urban settings, yet have been infrequently studied. Existing literature, based primarily on closed-canopy trees, suggests Douglas-fir trees in Pacific Northwest forests intercept approximately 25% of rainfall annually. Because open-grown trees have more vertical leaf area than individual trees in closed-canopy forests, I expected to

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14

Andrews, Garren M. "Post-fire Mortality and Response in a Redwood/ Douglas-fir Forest, Santa Cruz Mountains, California." DigitalCommons@CalPoly, 2012. https://digitalcommons.calpoly.edu/theses/882.

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We investigated how fire severity impacts the survival and response (sprouting/seeding) of multiple species in the Santa Cruz Mountains of coastal California, including coast redwood (Sequoia sempervirens), Douglas-fir (Pseudotsuga menziesii), tanoak (Lithocarpus densiflorus), and Pacific madrone(Arbutus menziesii). During August 2009 the Lockheed Fire burned nearly 3,160ha of mixed-conifer stands with variable severity. Data from 37 Continuous Forest Inventory (CFI) plots were collected immediately before and for 2 successive years following the 2009 Lockheed Fire. This research entails three

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15

Sankey, Temuulen Tsagaan. "20th Century forest-grassland ecotone shift and effects of livestock herbivory." Diss., Montana State University, 2005. http://etd.lib.montana.edu/etd/2005/sankey/SankeyT1205.pdf.

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16

Keeton, William Scott. "Occurrence and reproductive role of remnant old-growth trees in mature Douglas-fir forests, southern Washington, Cascade Range /." Thesis, Connect to this title online; UW restricted, 2000. http://hdl.handle.net/1773/5479.

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17

Alfaro, R. I., and R. N. MacDonald. "Effects of Defoliation by the Western False Hemlock Looper on Douglas-Fir Tree-Ring Chronologies." Tree-Ring Society, 1988. http://hdl.handle.net/10150/261809.

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Annual rings of Douglas-fir, Pseudotsuga menziesii (Mirb.) Franco, which sustained 1 year of defoliation by the western false hemlock looper, Nepytia freemanii Munroe (Lepidoptera: Geometridae), showed a period of decrease in breast height ring width starting in the year that followed the damage. The magnitude of the decrease was related to the degree of defoliation: there was no ring width decrease on trees that were 0-10% defoliated; the decrease became progressively more noticeable in trees which sustained increasingly higher defoliation; and it was maximum in trees which sustained 91-100%

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18

Klinka, Karel, R. E. (Reid E. ). Carter, and Christine Chourmouzis. "Relationships between coastal Douglas-fir site index and synoptic categorical measures of site quality." Forest Sciences Department, University of British Columbia, 2001. http://hdl.handle.net/2429/682.

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Knowledge of ecological characteristics of trees, sites and tree growth on different sites is fundamental for silvicultural decision-making and planning. With the biogeoclimatic ecosystem classification in place, silvicultural management in British Columbia has been given an ecological foundation; however, relationships between growth and site have not yet been fully investigated. The purpose of this study was to determine how height growth of Douglas-fir within the drier portion of the CWH zone varies with site. We adopted site index (m @ 50 yr bh) as a species-specific measure of forest p

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19

Adams, Seth Daniel. "Enzyme activities and nitrogen transformations following fertilization of a Douglas-fir forest in coastal British Columbia." Thesis, University of British Columbia, 2009. http://hdl.handle.net/2429/17438.

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Forest fertilization has long been used to enhance tree growth and timber yield. More recently, fertilization has become the focus of increased interest as a potential method for increasing soil C uptake, vis-à-vis suppression of microbial enzymes that decompose recalcitrant soil organic matter (SOM). However, fertilization is also associated with increased emission of the potent greenhouse gas N₂O. In this study I evaluate the effect of N amendment on activities of soil enzymes and on N ammonification and nitrification rates in a chronosequence of Douglas-fir stands on Vancouver Island, B

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20

Paul-Limoges, Eugenie. "Comparison of carbon and energy balances of a Douglas-fir forest from pre- to post-harvest." Thesis, University of British Columbia, 2013. http://hdl.handle.net/2429/45064.

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Stand-replacing disturbances, such as harvesting, have a major impact on the exchanges of carbon (C) and energy between forested land and the atmosphere. The former forest CO₂ sinks become net CO₂ sources due to the continued respiratory losses and to the significantly reduced photosynthetic uptake. Chronosequence studies, where current different-aged stands are used to reconstruct the development of an older stand, have been widely used to quantify the influence of harvesting on C and energy exchanges of forested stands. Almost no replicated measurements have been made within the Fluxnet comm

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21

Ishii, Hiroaki. "A canopy perspective of community dynamics of an old-growth Pseudotsuga-Tsuga forest /." Thesis, Connect to this title online; UW restricted, 2000. http://hdl.handle.net/1773/5573.

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22

Hawthorne, Iain. "Impacts of biochar application to a Douglas-fir forest soil on greenhouse gas fluxes and water quality." Thesis, University of British Columbia, 2017. http://hdl.handle.net/2429/61373.

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Forest management for carbon sequestration is a valuable tool to combat rising greenhouse gas (GHG) concentrations in the Earth’s atmosphere. This thesis examined the use of biochar, a product of the thermal decomposition of waste organic matter in a reduced oxygen environment (i.e. pyrolysis) that is applied to soil, as an option for increasing carbon sequestration in a Coastal Douglas-fir forest soil in British Columbia when applied with and without urea fertilizer at 200 kg N ha-¹. Biochar produced from Douglas-fir forestry slash materials was used in this study to address this from a syste

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23

Lorentz, Laura J. "Hyperspectral Reflectance and Stable Isotopic Nitrogen: Tools to Assess Forest Ecosystem Nitrogen Cycling." Thesis, Virginia Tech, 2013. http://hdl.handle.net/10919/51214.

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The use of nitrogenous fertilizers in agricultural and forestry practices coupled with increased fossil fuel combustion and resulting nitrogen (N) deposition across the landscape have contributed to a near doubling of N inputs to terrestrial ecosystems. With such dramatic changes have come adverse environmental consequences including the acidification of soil and water resources and an increased rate of biodiversity loss in both flora and fauna. A method of rapidly predicting ecosystem susceptibility to N loss across large spatial scales would facilitate the identification of those systems m

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24

Osberg, Peter Martin. "Lysimeter measurements of salal understory evapotranspiration and forest soil evaporation after salal removal in a Douglas-fir plantation." Thesis, University of British Columbia, 1986. http://hdl.handle.net/2429/26018.

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Two weighing lysimeters were constructed in a 23-year-old Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) stand. The salal (Gaultheria shallon Pursh.) understory was mechanically removed from a 30 x 40 m plot and one lysimeter was located at the center of this plot to measure daily forest soil evaporation (E[sub s]). For 8 consecutive days, in August 1984, E[sub s] ranged between 0.08 and 0.34 mm d⁻¹ which was 15-18% of the daily total stand evapotranspiration. In July 1985, after removing salal from the second lysimeter, which was positioned under a less dense tree canopy, E[sub s] was 0.3

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25

Griffith, Kereen. "Effects of Vegetation Structure and Canopy Exposure on Small-scale Variation in Atmospheric Deposition Inputs to a Mixed Conifer Forest in California." Thesis, University of North Texas, 2014. https://digital.library.unt.edu/ark:/67531/metadc500055/.

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Data on rates of atmospheric deposition is limited in many montane ecosystems, where high spatial variability in meteorological, topographic, and vegetation factors contributes to elevated atmospheric inputs and to the creation of deposition hotspots. Addressing the ecological consequences of increasing deposition in these areas will require a better understanding of surface controls influencing atmospheric deposition rates at both large and small-scales. The overarching objective of this thesis research was to understand the influence of vegetation structure and canopy exposure on small-scale

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26

Leitch, Adrian. "Summertime horizontal and vertical advective carbon dioxide fluxes measured in a closed-canopy Douglas-fir forest on a slope." Thesis, University of British Columbia, 2010. http://hdl.handle.net/2429/28039.

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An observational study was conducted during an eight-week period in the summer of 2009 at a forested site in British Columbia (“DF49”) to determine the incidence and magnitude of advective carbon dioxide (CO₂) fluxes. The site is situated in a tall, closed-canopy (zh = 35 m, 1100 stems ha-¹, LAI of 7 m² m-²) Douglas-fir forest on a 5-10o slope. Katabatic flow occurs within the subcanopy during a significant portion of the day, especially during the evening and night. Wind vector and CO₂ concentration measurements were made at heights of 1, 2.6, 8, 20 and 42 m on the main flux tower, while CO₂

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27

Comfort, Emily Julia. "Subcanopy response to variable-density thinning in second growth forests of the Pacific Northwest." Master's thesis, Mississippi State : Mississippi State University, 2007. http://library.msstate.edu/etd/show.asp?etd=etd-10082007-154736.

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28

Frank, Charles Joseph. "Impact of the Western Spruce Budworm on Buds, Developing Cones and Seeds of Douglas-Fir in the Intermountain Region." DigitalCommons@USU, 1986. https://digitalcommons.usu.edu/etd/7301.

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The western spruce budworm, Choristoneura occidentalis Freeman (Lepidoptera: Tortricidae), is a serious defoliator of conifers in the western U.S. and western Canada. In 1985 epidemic levels of the budworm caused average tree defoliation in west-central Idaho to increase to 83%, up substantially from the 35% average tree defoliation of 1984. Associated with this increase in defoliation was a change in the relative stand defolation ranking between the two years. found to damage all types and In 1985 the budworm was developmental stages of reproductive structures of Douglas- fir, including: seed

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29

Coulston, John Wesley Riitters Kurt Smith Gretchen Cole. "Large-scale analysis of sustainable forest management indicators assessments of air pollution, forest disturbance, and biodiviersity [sic] /." Connect to this title online, 2004. http://www.lib.ncsu.edu/theses/available/etd-03282004-103433/.

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30

Zhong, Anliang. "Efficacy of secondary biosolids fertilization in a managed Douglas-fir forest in the Coastal Western Hemlock zone of British Columbia." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ27275.pdf.

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31

Beiler, Kevin Jon. "The complex socio-spatial architecture of Rhizopogon spp. mycorrhizal networks in xeric and mesic old-growth interior Douglas-fir forest plots." Thesis, University of British Columbia, 2011. http://hdl.handle.net/2429/40000.

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Mycorrhizal networks (MNs) can influence tree establishment and resource competition but little is known regarding their underlying architecture in situ. This study examined the socio-spatial architecture of MNs between Rhizopogon spp. genets and interior Douglas-fir (Pseudotsuga menziesii var. glauca (Beissn.) Franco) trees in an old-growth forest. MN features were contrasted between plots with xeric versus mesic soil moisture regimes as a proxy for changes in site water stress anticipated with climate change. My objectives were to: (1) describe the fine-scale spatial patterns and autecolo

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32

Cunningham, Catherine A. "Bark Beetle Activity in Douglas-Fir, Pseudotsuga menziesii var. glauca Mirb. (Franco), Following the 1994 Beaver Mountain Fire." DigitalCommons@USU, 1997. https://digitalcommons.usu.edu/etd/7267.

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The 1994 Beaver Mountain fire ignited the canopies of subalpine fir, Abies lasiocarpa, and spread ground fire into adjacent Douglas-fir forests, Pseudotsuga menziesii var. glauca. Despite shorter flight seasons due to lower annual temperatures and persistent snow, the Douglas-fir bark beetle, Dendroctonus pseudotsugae Hopkins, attacked a range of moderately fire-injured host conifers. Logistic regression models illustrated that in 1995 associated bark beetles selected large diameter Douglas-fir with 60-80% bole char, 60-80% crown volume scorch, and 50-70% probability of mortality due to fire.

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33

Vihnanek, Robert E. "The effects of slashburning on the growth and nutrition of young Douglas-fir plantations in some dry, salal-dominated ecosystems." Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/25062.

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Twenty Douglas-fir plantations, ranging from 5 to 15 years old, were examined on the east side of Vancouver Island. In all areas studied, salal was the dominant ground cover, and was suspected of being a major competitor with trees for water and nutrients. In each plantation, part of the area has been burned and part was unburned. Stocking of planted Douglas-firs was found to be greater on the burned than on the unburned areas of 16 sites and height growth of planted Douglas-firs was greater on the burned than on the unburned areas of 18 sites. Some degree of nitrogen deficiency was inferred f

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Mitchell, Stephen Jarvis. "Assessing and promoting windfirmness in conifers in British Columbia." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ46393.pdf.

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35

Price, David Thomas. "Some effects of variation in weather and soil water storage on canopy evapotranspiration and net photosynthesis of a young douglas-fir stand." Thesis, University of British Columbia, 1987. http://hdl.handle.net/2429/27511.

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Measurements of the energy balances and net photosynthesis rates of two low productivity coniferous forest canopies (12 and 22 years old), were made successfully during both wet and dry growing seasons, using a modified Bowen Ratio method. Canopy conductances (gc) were calculated from canopy evaporation rates (E) using the Penman-Monteith equation. A model was developed to predict canopy growth and evaporation rates from basic soil and weather data, and compared with the measured data. The photosynthesis model was physiologically based, derived from recent work of Farquhar and coworkers. The c

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Klinka, Karel. "Survival and growth of planted seedlings on woody and non-woody forest floor substrates in high and low light environments of coastal British Columbia." Forest Sciences Department, University of British Columbia, 2001. http://hdl.handle.net/2429/647.

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In the wetter climates associated with the coastal forests of northwestern North America, coarse woody debris (CWD) accumulations in the form of snags, downed boles, and large branches can be large in natural forest ecosystems. Seedlings often regenerate on stumps and downed logs in the understory of old-growth coastal forests. The question remains though, whether CWD is a necessary component for seedling survival and growth in forests managed for commodity production. This study addresses one concern of forest managers: is there an immediate nutritional or moisture supply advantage conferr

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Klinka, Karel, David Morley New, and Christine Chourmouzis. "Western larch site index in relation to ecological measures of site quality." Forest Sciences Department, University of British Columbia, 2000. http://hdl.handle.net/2429/701.

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A silviculturist needs to know how productivity of all tree species under management varies with the ecological determinants of site quality, i.e., the environmental factors that directly affect the growth of plants - light, heat, soil moisture, soil nutrients, and soil aeration. A good understanding of this variation is necessary for making biologically viable, speciesand site specific silvicultural decisions. Productivity of a given species is usually measured by site index (top tree height at 50 years at breast height age). Quantified relationships between site index of a given species and

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Pati, Adolpho J. "Formica integroides of Swakum Mountain : a qualitative and quantitative assessment and narrative of Formica mounding behaviors influencing litter decomposition in a dry, interior Douglas-fir forest in British Columbia." Thesis, University of British Columbia, 2014. http://hdl.handle.net/2429/50422.

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Formica spp. mound construction is fundamental to northern forests as their activities govern and shape forest floor dynamics and litter decomposition. The interior Douglas-fir forest at Swakum Mountain contains a super colony of Formica integroides whose presence and monolithic structures dramatically demonstrate their impact on the landscape. Through a series of observations, natural and controlled experiments I examine the effects of Formica mounding on litter decomposition. The basic measurements of temperature, moisture, evolved CO2, and mass loss reveal that Formica mounds buffer litter

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Klinka, Karel, David James Brisco, Gordon D. (Gordon Donald) Nigh, and Christine Chourmouzis. "New height growth models for western larch in British Columbia." Forest Sciences Department, University of British Columbia, 2001. http://hdl.handle.net/2429/699.

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Western larch (Larix occidentalis Nutt.) is a locally important species in the Nelson Forest Region, and to a lesser extent, in the Kamloops Forest Region. Its range extends from west of the Rockies to Okanagan Lake, and north to Salmon Arm, in the IDF, ICH, MS, and ESSF biogeoclimatic zones. Prior to this study, the site index curves developed for western larch in western Montana were used to model height and estimate site index in British Columbia. It has been suggested that these curves may not adequately reflect the height growth patterns of western larch in BC. Differences could arise fro

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Klinka, Karel. "Trembling aspen site index in relation to environmental measures of site quality." Forest Sciences Department, University of British Columbia, 2001. http://hdl.handle.net/2429/666.

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Trembling aspen (Populus tremuloides Michx.) is one of the most common tree species in the boreal and temperate forests of North America. It grows on many different sites and associates with a variety of tree species. In BC, aspen is frequent throughout all submontane and montane continental forested zones. Relationships between environmental factors and forest productivity have been the subjects of many studies. Most of these studies, using various topographic, soil, physical and chemical properties as independent variables, had limited success in accounting for the variation in SI over a lar

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41

Christensen, Glenn A. "Development of Douglas-fir log quality, product yield, and stand value after repeated thinnings in western Oregon /." 1997. http://hdl.handle.net/1957/10305.

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Stringer, Darin S. "Growth and yield, structure, composition, and soil compaction in a Western Oregon Douglas-fir forest after 35 years of modified selection thinning /." 1999. http://hdl.handle.net/1957/11050.

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43

O'Dea, Mary E. "The clonal development of vine maple during Douglas-fir stand development in the Coast Range of Oregon /." 1992. http://hdl.handle.net/1957/13506.

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Colinas, Carlos. "Seedling survival, mycorrhiza development and rhizosphere biology of Pseudotsuga menziesii seedlings outplanted on a degraded forest site in southwestern Oregon /." 1992. http://hdl.handle.net/1957/10518.

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Suzuki, Nobuya. "Effects of thinning forest-floor vertebrates and analysis of habitat associations along ecological gradients in Oregon coastal Douglas-fir forests /." 2000. http://hdl.handle.net/1957/11066.

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Chiwocha, Sheila. "Douglas fir megagametophyte development in situ and in vitro." Thesis, 2004. https://dspace.library.uvic.ca//handle/1828/9049.

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Megagametophyte development in situ and in vitro was investigated in Douglas fir to address the following questions: (1) Do endogenous levels of plant hormones change during megagametophyte development and are they associated with morphological changes? (2) Can megagametophytes be cultured prior to fertilization? (3) Can embryos be rescued from megagametophytes cultured soon after fertilization? A histochemical study of storage reserve deposition during megagametophyte development was performed with material isolated weekly for 11 weeks. Prior to fertilization, starch was detected in the ne

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Witcosky, Jeffrey John. "The root insect-- black-stain root disease association in Douglas-fir : vector relationships and implications for forest management /." 1985. http://hdl.handle.net/1957/11535.

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48

Drewitt, Gordon Bruce. "Carbon dioxide flux measurements from a coastal Douglas-fir forest floor." Thesis, 2002. http://hdl.handle.net/2429/13576.

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Soils can store large quantities of carbon in the form of decaying organic matter originally derived from vegetation. In order to gain a better understanding of the importance of soils in the carbon cycle, it is necessary to examine processes that directly affect the exchange of carbon between the soil and the atmosphere. During the year 2000, measurements of forest floor CO₂ flux and below-ground CO₂ storage were obtained beneath the canopy of a 33-m tall coastal temperate Douglas-fir forest. The study took place at a micrometeorological tower flux site in operation since late 1997 obt

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Ketchum, J. Scott. "Douglas-fir, grand fir and plant community regeneration in three silvicultural systems in western Oregon /." 1995. http://hdl.handle.net/1957/10938.

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Zenner, Eric K. "Effects of residual trees on growth of young to mature Douglas- fir and western hemlock in the western central Oregon Cascades /." 1995. http://hdl.handle.net/1957/13627.

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