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Thèses sur le sujet « Douglas fir. Seedlings »

Auteur : Grafiati

Publié le 4 juin 2021

Mis à jour le 10 février 2022

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1

Bracher, Grant Allan. "Detection of nutrient stress in Douglas-fir seedlings using spectroradiometer data." Thesis, University of British Columbia, 1991. http://hdl.handle.net/2429/30961.

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Narrow-band spectral reflectance measurements in the visible and near-infrared region of the spectrum were investigated for the detection of nutrient deficiencies, and estimating the foliar concentrations of nitrogen, phosphorus, sulphur, and total chlorophyll. One-year-old Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) seedlings were treated with 24 nutrient solutions containing nitrogen, phosphorus and sulphur levels ranging from 1 to 400 mg/L. After one growing season, newly matured needles were harvested, spectral reflectance measured from 400 to 1100 nm, and foliar samples analyzed fo

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2

Wickman, Marise. "The practical application of two dormancy induction trials on douglas-fir and western hemlock container seedlings." Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/24429.

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Two dormancy induction trials were conducted in a private container nursery in Saanichton, British Columbia. The first study examined the effects of photoperiod induced dormancy on morphology, root growth and field performance of fall planted western hemlock (Tsuga heterophyl_1ji (Raf.)Sarg.) and Douglas-fir (Pseudotsuga menzi_esv[ (Mirb.) Franco) seedlings. Various periods of eight hour days, ranging from two to eight weeks, were applied throughout July and August 1983. Outplanting was done in late September. Survival and growth were assessed one year later. The second project investigated t

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3

Cline, Erica Theon. "Mycorrhizal fungus communities of Douglas-fir (Pseudotsuga menziesii) seedlings and trees : effects of proximity to residual trees /." Thesis, Connect to this title online; UW restricted, 2004. http://hdl.handle.net/1773/5557.

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4

Klinka, Karel. "Survival and growth of western larch seedlings in relation to light availability." Forest Sciences Department, University of British Columbia, 1997. http://hdl.handle.net/2429/651.

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Western larch (Larix occidentalis Nutt.) is an important component of the montane forest in southeastern British Columbia. It grows in cool-temperate (IDF and ICH zones) and boreal climates (MS zone and, occasionally, ESSF zone). Larch is considered a very shade-intolerant species which can tolerate low light (partial shading) only during the seedling stage (the first 5 growing seasons). Typically, it regenerates after fire in the open on seedbeds exposed by burning. However, to what extent it tolerates low light and how various light environments affect its survival and growth is not known. T

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5

Noble, Robert James. "The response to UV-B irradiation of Douglas-fir seedlings (Pseudotsuga menziesii spp. glauca) propagated from seed collected from different elevations along a transect." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ36620.pdf.

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6

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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7

Xue, Jianming. "Effects of biuret addition on soil nitrogen transformations and Douglas fir seedling growth." Thesis, University of Canterbury. Forestry, 2002. http://hdl.handle.net/10092/7595.

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This project was carried out to evaluate the feasibility of using of biuret as a plant growth and/or soil microbial activity regulator at low concentrations, and as a slow-release N fertiliser at high concentrations. Biuret stimulated Douglas-fir seedling growth at low concentrations, but inhibited it at high concentrations. The stimulation of biuret on seedling growth in sand and solution culture was associated with increased net photosynthetic rate and nutrient uptake and when grown in the soil it was also related to the improvement of soil N availability and therefore the uptake of N by se

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8

Malmqvist, Cecilia. "Planting and survivability of Douglas fir (Pseudotsuga menziesii (Mirb.) Franco) in Sweden : Questions of seedling storability, site preparation, bud burst timing and freezing tolerance." Doctoral thesis, Linnéuniversitetet, Institutionen för skog och träteknik (SOT), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-59933.

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The non-native Douglas fir (Pseudotsuga menziesii (Mirb.) Franco) has been grown to a limited extent in the southern part of Sweden since the early 1900s. A more extensive use has probably been curtailed by its known susceptibility to damage by frost, pine weevil and other pests. Limited access to vital seedlings of suitable provenances has also restricted its more widespread growth. The need for valuable species that will grow well through ongoing climate change has increased the interest for Douglas fir in Sweden. This thesis addresses a number of important questions relating to the planting

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9

Bates, Sarah L. "Impact of feeding by the western conifer seed bug, Leptoglossus occidentalis (Heidemann) (Hemiptera: Coreidae), on yield, seed storage reserves and seedling vigour in Douglas-fir." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/MQ51294.pdf.

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10

O'Neill, Gregory Arthur. "Genetics of fall, winter and spring cold hardiness in coastal Douglas-fir seedlings /." 1999. http://hdl.handle.net/1957/13745.

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11

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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12

Schuch, Ursula K. "Frost hardiness of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) seedlings raised in three nurseries /." 1987. http://hdl.handle.net/1957/11065.

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13

Haase, Diane L. "Transplant shock in stored and unstored 2+0 Douglas-fir seedlings : effect of initial root volume and soil water content /." 1991. http://hdl.handle.net/1957/10703.

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14

Joseph, Gladwin. "Water relations, gas exchange, and growth responses of Douglas-fir seedlings to stresses associated with transplanting /." 1996. http://hdl.handle.net/1957/10982.

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15

Alzugaray, Oswald Patricio Javier. "Effects of fertilization at the time of planting on field performance of 1+1 Douglas-fir [Pseudotsuga menziesii (Mirb.) Franco] seedlings /." 2002. http://hdl.handle.net/1957/11014.

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16

Lomas, M. Christine. "Physiology and genetics of drought hardiness in coastal Douglas-fir (Pseudotsuga menziesii var. menziesii (Mirb.) Franco) seedlings /." 1999. http://hdl.handle.net/1957/10928.

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17

Arellano, Ogaz Eduardo. "Effect of soil type, fertilizer, and soil moisture on 1+0 Douglas-fir [Pseudotsuga menziesii (Mirb.) Franco] seedlings /." 2003. http://hdl.handle.net/1957/13121.

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18

Burney, Owen T. "Effects of vegetation control, stock size, fertilization, and soil moisture on the shoot and root development of Douglas-fir seedlings /." 2002. http://hdl.handle.net/1957/13145.

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19

Khan, Shafiqur Rehman. "Effects of water stress on phenology, physiology, and morphology of containerized Douglas-fir (Psuedotsuga menziesii (mirb.) Franco) seedlings /." 1992. http://hdl.handle.net/1957/10894.

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20

Forward, Benjamin Spencer. "Characterization and expression of the Douglas-fir luminal binding protein." Thesis, 2000. https://dspace.library.uvic.ca//handle/1828/9482.

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The endoplasmic reticulum (ER) molecular chaperone, BiP, plays a role in the translocation and subsequent folding and assembly of newly synthesized proteins targeted to the ER and secretory pathway. The sequence encoding a Douglas-fir (Pseudotsuga menziesii [Mirb] Franco) BiP homologue (PmBiP) was identified by differential screening of a seedling cDNA library. Southern blotting indicated that PmBiP is most likely present as a single copy although other BiP alleles likely exist within a given seedlot. The deduced amino acid sequence of PmBiP contains a HEEL tetrapeptide sequence which f

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21

Lu, Shengjun. "Root respiration of Douglas-fir and western hemlock seedlings /." 1994. http://hdl.handle.net/1957/10997.

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22

Graff, Joseph Edward. "Responses of Douglas-fir seedlings to various nursery handling and outplanting practices /." 1986. http://hdl.handle.net/1957/10864.

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23

Fisker, Susan E. "Chlorophyll fluorescence as a measure of cold hardiness and freezing stress in 1 + 1 Douglas-fir seedlings : response to seasonal changes in the nursery /." 1992. http://hdl.handle.net/1957/10975.

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24

Graham, Jeff S. "The control of bud development in Douglas-fir seedlings by photoperiod, flurprimidol, and endogenous gibberellins and abscisic acid /." 1989. http://hdl.handle.net/1957/10865.

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25

Nicholson, Alison Campbell. "Water relations, survival and growth of Douglas-fir seedlings at a pinegrass dominated site in the interior Douglas-fir zone of south- central British Columbia /." 1989. http://hdl.handle.net/1957/9277.

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26

Whiting, Elizabeth Cameron. "The effects of nursery incurred tap-root wounds on growth of Douglas-fir seedlings /." 1987. http://hdl.handle.net/1957/13254.

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27

Neumann, Melody J. "Seedborne fusarium and root colonization of container-grown douglas-fir seedlings." Thesis, 1993. http://hdl.handle.net/2429/2150.

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The role of seedborne Fusarium in root colonization of container-grown Douglas-fir seedlings was studied in two coastal Douglas-fir seedlots; one contaminated with Fusarium and the other with minimal Fusarium. Seedlots were treated using either a standing water imbibition, or a running water imbibition with a post-stratification hydrogen peroxide sanitation treatment. The sanitation treatment significantly reduced the number of Fusarium-contaminated seeds. Seedlings were grown in an operational conifer nursery and seedling infection and root colonization by Fusarium was assessed throughout the

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28

McCreary, Douglas D. "Evaluating the quality of Douglas-fir (Pseudotsuga menziessii (Mirb.) Franco) seedlings : a comparison of some current and proposed evaluation methods /." 1986. http://hdl.handle.net/1957/10988.

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29

Cooke, Pamela T. "The role of density and proportion in allometric equations of Douglas-fir and red alder seedlings /." 1987. http://hdl.handle.net/1957/13256.

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30

Margolis, Hank A. "Carbon and nitrogen allocation patterns of 2-0 Douglas-fir seedlings following nitrogen fertilization in the autumn /." 1985. http://hdl.handle.net/1957/13277.

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31

Budge, Sonya M. "Temperature acclimation of root respiration in Douglas-fir and western red cedar seedlings." Thesis, 1996. http://hdl.handle.net/2429/4703.

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This study examined the ability of seedlings of coastal and interior provenances of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) and western red cedar (Thuja plicata Donn) to acclimate root respiration rates to growth temperature. A second objective was to determine whether acclimation involved an increase in activity and/or capacity of the alternative path of electron transport, a phenomenon observed in many crop species. Since western red cedar has less genetic variation than Douglas-fir, one might expect better acclimation in cedar. Seedlings were grown hydroponically in compu

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32

McClain, Keith M. "Water relations and associated morphology of conditioned Douglas-fir and jack pine seedlings subjected to periods of drought stress /." 1986. http://hdl.handle.net/1957/11016.

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33

Smith, Julia P. "Differential growth of roots and shoots of Douglas-fir (Pseudotsuga menziesii) seedlings infested with Cinara pseudotsugae, and population dynamics of a parasitoid wasp (Pauesia sp.) of C. pseudotsugae." Thesis, 1997. http://hdl.handle.net/1957/33920.

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Aphids are a widespread family of plant pests, whose abilities to suppress shoot and root growth are well documented for many terrestrial plants. Only a few studies have been conducted on conifer aphids of the genus Cinara. Cinara pseudotsugae are known to attack Douglas-fir seedlings, an important crop in the Pacific Northwest. Douglas-fir are most susceptible to aphid damage as seedlings, especially in nurseries where conditions favor aphid outbreaks. A parasitoid wasp (Pauesia sp.) attacks C. pseudotsugae, and may be useful as a biological control agent. Studies of its natural history and h

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34

Shainsky, Lauri J. "Competitive interactions between Douglas-fir and red alder seedlings : growth analysis, resource use, and physiology /." 1988. http://hdl.handle.net/1957/11064.

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35

Chatthai, Malinee. "Molecular characterization and regulation of embryogenesis-associated genes in Douglas-fir (Pseudotsuga menziesii [Mirb.] Franco)." Thesis, 1999. https://dspace.library.uvic.ca//handle/1828/8908.

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As a direct approach to investigate the molecular basis of embryogenesis in Douglas-fir (Pseudotsuga menziesii [Mirb.] Franco), a cDNA library made from poly(A)⁺ RNA of developing seeds was differentially screened for clones representing transcripts abundant in the developing seeds but absent in mature seeds. Of a number of clones isolated, two groups were selected for further sequence and gene expression analysis. A group of four cDNA clones (PM2S1, PM2S2, PM2S3 and PM2S4) shared a significant nucleotide and deduced amino acid sequence similarity with each other and with gymnosperm 2S seed

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36

Hipkins, Valerie D. "Biochemical markers of quality in Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) seedlings : the relationship between survival, root growth potential, freezing and drying damage, and time of lift /." 1988. http://hdl.handle.net/1957/10879.

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37

Smit, Julie. "Effects of root growth and physiology on drought resistance in Douglas-fir, lodgepole pine, and white spruce seedlings." Thesis, 1993. https://dspace.library.uvic.ca//handle/1828/9656.

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Two aspects of drought resistance were investigated on wet and dry ecotypes of three conifer species: 1) the relative importance of drought avoidance and drought tolerance mechanisms in resisting drought stress was assessed on Douglas-fir (Pseudotsuga menzieseii) and lodgepole pine (Pinus contorta) seedlings, and 2) the effects of drought on root hydraulic conductance and low temperature, on root water flow rates Were assessed on first-year seedlings of Douglas-fir, lodgepole pine and white spruce (Picea glauca). To study drought avoidance, Douglas-fir and lodgepole pine seedlings were

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38

Graff, Joseph Edward. "Ionic balance and the constituent organic acids of current-year foliage of western redcedar, western hemlock, and Douglas-fir seedlings /." 1993. http://hdl.handle.net/1957/10705.

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39

Borchers, Susan L. "Growth and mycorrhiza formation of Douglas-fir seedlings grown in soils collected at different distances from hardwoods pioneering southwest-Oregon clearcuts /." 1988. http://hdl.handle.net/1957/13279.

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40

Everett, Kim. "Growth and nutrient allocation of Douglas-fir seedlings : response to varying ammonium : nitrate ratios and to different methods of nursery fertilizer application." Thesis, 2005. http://hdl.handle.net/1828/1847.

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Regeneration of Douglas-fir following harvesting has proven difficult on many sites in British Columbia. As a result, alternative nursery practices are being explored to improve seedling growth. Using two experiments I aimed to identify an improved nutritional program for Douglas-fir seedlings. The objective of the first experiment was to identify the optimum nitrogen (N) source ratio for Douglas-fir between two inorganic sources of N, ammonium (NH4+) and nitrate (NO3-). Seedlings were grown in controlled environments in aeroponic culture with solutions containing 0:100, 20:80, 40:60, 60:40, 8

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41

Dinger, Eric J. "Characterizing early-seral competitive mechanisms influencing Douglas-fir seedling growth, vegetation community development, and physiology of selected weedy plant species." Thesis, 2012. http://hdl.handle.net/1957/29479.

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Three studies were conducted to characterize and present early-seral competition between Douglas-fir seedlings and the surrounding vegetation communities during Pacific Northwest forest establishment. The first experiment served as the foundation for this dissertation and was designed to quantify tradeoffs associated with delaying forest establishment activities by introducing a fallow year in order to provide longer-term management of competing vegetation. A range of six operationally relevant treatments were applied over two growing seasons that included in the first (1) a no-action control,

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42

Birchler, Todd M. "Fall fertilization effects on Douglas-fir seedling quality /." 1997. http://hdl.handle.net/1957/10446.

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43

Jacobs, Douglass Frederick. "Influence of root architectural development on Douglas-fir seedling morphology and physiology /." 2001. http://hdl.handle.net/1957/13332.

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44

Cress, Daniel W. "The effects of inbreeding and supplemental mass pollination upon seed yields in a Douglas-fir seedling seed orchard /." 1988. http://hdl.handle.net/1957/13280.

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45

Darychuk, Nicole T. "Seedling cold and drought hardiness in half-sib families of submaritime Douglas-fir." Thesis, 2009. http://hdl.handle.net/1828/2852.

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The submaritime zone of British Columbia experiences summer drought and spring and fall frosts which cause high mortality of seedlings planted for reforestation. Seedlings of half-sib Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) families were studied at 3 test sites in the coast mountains of British Columbia, and in a complementary pot trial on southern Vancouver Island from 2007-2008, with the aim of studying physiological traits related to cold and drought hardiness. These families originated from British Columbia's submaritime zone, and had a range of breeding values. This allowed for

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46

Turner, Jennifer R. "The effect of nursery cultural and handling techniques on Douglas-Fir seedling quality." Thesis, 2001. http://hdl.handle.net/2429/11886.

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This study investigated the effects of nursery cultural regime on the quality of coastal Douglas-Fir (Pseudotsuga menziesii (Mirb.) Franco var. menziesii) container seedlings. Douglas-Fir seedlings from Oregon and Vancouver Island provenances (i.e. populations) were lifted in the 1999/2000 winter on four dates, subjected to four cold storage lengths at a temperature of -2°C or +1°C, and thawed (-2°C storage only) for one or three weeks. The three-week thawing period decreased root growth capacity and chlorophyll fluorescence measures of initial survival potential below their quality thre

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47

Fried, Jeremy Steven. "Two studies of Acer macrophyllum : I. The effects of bigleaf maple on soils in Douglas-fir forests : II. The ecology of bigleaf maple seedling establishment and early growth in Douglas-fir forests /." 1985. http://hdl.handle.net/1957/11031.

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48

Petersen, Terry DeWayne. "Dynamics of size structures : simulation and experiments in seedling stands of Pseudotsuga menziesii and Fraxinus mandshurica /." 1989. http://hdl.handle.net/1957/13512.

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