Dissertationen zum Thema „Douglas fir (Pseudotsuga menziesii Mirb. Franco)“
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Koshy, Mathew P. „Genetic effects on wood shrinkage, relative density, grain angle, tracheid length, and fibril angle in Douglas-fir (Pseudotsuga menziessi var. menziesii (mirb.) franco)“. Thesis, University of British Columbia, 1993. http://hdl.handle.net/2429/41465.
Der volle Inhalt der QuelleForestry, Faculty of
Graduate
Akhter, Shaheen. „The provenance variation in natural durability of Douglas fir (Pseudotsuga menziesii (Mirb.) Franco)“. Thesis, Bangor University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.367387.
Der volle Inhalt der QuelleFontes, LuiÌs. „The performance, constraints and potential of Douglas-fir [Pseudotsuga menziesii (Mirb.) Franco] in Portugal“. Thesis, University of Oxford, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.249393.
Der volle Inhalt der QuelleCunningham, 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.
Der volle Inhalt der QuelleChatthai, Malinee. „Molecular characterization and regulation of embryogenesis-associated genes in Douglas-fir (Pseudotsuga menziesiic (Mirb.) Franco)“. Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape2/PQDD_0015/NQ44790.pdf.
Der volle Inhalt der QuelleKantarl, Mustafa. „Intraspecific variation in the IUFRO 16 year old Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) : Provenance-progeny trial in Haney, British Columbia“. Thesis, University of British Columbia, 1989. http://hdl.handle.net/2429/27495.
Der volle Inhalt der QuelleForestry, Faculty of
Graduate
Jansen, Kirstin. „Stable Isotopes and Metabolite Profiles as Physiological Markers for the Drought Stress Sensitivity in Douglas-Fir Provenances (Pseudotsuga menziesii (MIRB.) FRANCO)“. Doctoral thesis, Humboldt-Universität zu Berlin, 2018. http://dx.doi.org/10.18452/19617.
Der volle Inhalt der QuelleIn Central Europe, more frequent periods of dry and hot weather are expected in the future with economic losses in the forestry sector. Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) is discussed as a timber species alternative to the economically important but drought-sensitive spruce (Picea abies (L.) H. Karst.). Two subspecies, the coastal (FDC) and the interior Douglas-fir (FDI), are native to an extensive natural range in North America, offering a great potential for the selection of productive and drought tolerant provenances. Our goal was to investigate the drought response of different Douglas-fir provenances on the morphological and physiological level, as well as the mechanisms underlying drought resistance or susceptibility. A provenance trial in southwestern Germany established in 1958 allowed the study of 50-year-old Douglas-fir trees of diverse provenances along a height gradient. Under controlled conditions, we simulated the effects of a heat wave on young trees of two provenances. We analyzed carbon and oxygen stable isotopic composition, leaf gas exchange, changes in metabolism and tree growth. FDC from humid regions responded to drought with strong growth decline and a medium to strong stomatal closure, supported by enhanced instantaneous photoprotection. FDC from regions with very dry summer conditions showed a small growth decline and anisohydric regulation of stomatal conductance under drought, supported by high levels of osmotic adjustment. High monoterpene emissions might contribute to the drought resistance. FDI from an arid region showed high assimilation rates, low growth potential and a high antioxidant, photoprotective, drought and heat protective potential. The provenances differ greatly in their dry reaction and their protective mechanisms. The cultivation of drought resistant crops will be beneficial at sites predicted to accumulate arid summer periods.
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.
Der volle Inhalt der QuelleJansen, Kirstin [Verfasser], Arthur [Gutachter] Gessler, Ralf [Gutachter] Kätzel und Andreas [Gutachter] Rigling. „Stable Isotopes and Metabolite Profiles as Physiological Markers for the Drought Stress Sensitivity in Douglas-Fir Provenances (Pseudotsuga menziesii (MIRB.) FRANCO) / Kirstin Jansen ; Gutachter: Arthur Gessler, Ralf Kätzel, Andreas Rigling“. Berlin : Humboldt-Universität zu Berlin, 2018. http://d-nb.info/1184576890/34.
Der volle Inhalt der QuelleVan, Rooij Mahaut. „Etude du rougissement hivernal du Douglas : entre températures douces & formation de glace“. Electronic Thesis or Diss., Université Clermont Auvergne (2021-...), 2023. http://www.theses.fr/2023UCFA0154.
Der volle Inhalt der QuelleThe Douglas fir is the first reforestation species in the Auvergne-Rhône-Alpes region and the second in France as a whole, and is of considerable economic importance in France, where 13 million trees are produced each year. Winter reddening affects young Douglas-fir (< 15 years old), affecting up to 80% of the plantation. A reddening tree has no silvicultural future and typically dies within a year after reddening. The objectives of my PhD thesis were to have a better understanding of winter reddening by identifying the climatic parameters that trigger reddening and, more importantly, the physiological mechanism(s) that cause needle reddening.A thorough literature review and bioclimatic analysis were undertaken to identify critical climatic factors. The literature synthesis identified certain climatic conditions characteristic of 'reddening' years, including anticyclonic periods after winter and/or alternating cold and warm periods. Both the literature synthesis and the bioclimatic analysis identified a combination of climatic variables: warm daily temperatures, high daily temperature amplitude, at least moderate wind speeds and relative humidity. However, the freeze-thaw cycles with cold night temperatures did not emerge from the climate analysis, although they are mentioned in the literature.In order to understand how Douglas fir reddens, we first identified gaps in our knowledge of winter reddening and proposed potential mechanisms, either single or interacting, that cause this physiological disorder: 1) winter drought leading to hydraulic failure, 2) photo-oxidative stress, and 3) premature deacclimation. Under controlled conditions, young Douglas fir trees were exposed to winter drought through a temperature differential between roots and canopy (TSOIL < 5°C; TMOY_AIR ~ 14°C). Some of these trees were exposed to light intensities that could induce photooxydative stress (> 1800 PPFD). Cold soil temperatures induced moderate water stress by limiting root water uptake, while warm air temperatures caused water loss at the needle level. However, Douglas fir was able to acclimate to this new environment and even resumed growth. Exposure to high light intensity did not cause irreversible damage to PSII or photooxydative stress. No reddening of the Douglas fir was observed, thus refuting hypothesis 2, but partially supporting hypothesis 1, as the canopy was not exposed to freezing stress. In the field, continuous measurements of young Douglas fir diameter variation were coupled with temperature/humidity measurements from four plots in the Massif Central from December 2020 to June 2023. Spring frosts in April 2021 on deacclimated Douglas fir did not result in needle reddening or cambial damages, thus failing to validate hypothesis 3. Nevertheless, comparison of a asymptomatic winter (2021) with a asymptomatic winter i.e. with winter reddening (2022) revealed significant hydraulic stress generated from the apex, associated with an anticyclone period in January 2022. Hydraulic failure could be exacerbated by daily transpiration, combined with freeze-thaw cycles that increase hydraulic stress, leading to canopy hydraulic failure that could explain needle desiccation and reddening. We therefore favour hypothesis 1, which should be tested under controlled conditions
Duponnois, Robin. „Les bactéries auxiliaires de la mycorhization du Douglas (Pseudotsuga menziesii (Mirb. ) Franco) par Laccaria laccata souche S238“. Nancy 1, 1992. http://docnum.univ-lorraine.fr/public/SCD_T_1992_0023_DUPONNOIS.pdf.
Der volle Inhalt der QuelleRuiz, diaz britez Manuela. „Adaptation du douglas (Pseudotsuga menziesii (MIRB.) FRANCO) aux changements climatiques : étude rétrospective basée sur l’analyse des cernes“. Thesis, Paris, Institut agronomique, vétérinaire et forestier de France, 2016. http://www.theses.fr/2016IAVF0011/document.
Der volle Inhalt der QuelleForest response to the drought increase associated to the climatic warming relies on tree adaptive potential, i.e. the genetic variation and the heritability of adaptive traits involved in resistance to drought. In the first chapter, we identify easy-to-measure proxies of adaptive traits for resistance to drought. We compare the wood microdensity of dead and surviving trees after the 2003 heat wave in France. The most discriminating variables are the mean density of high and lowdensity segments, high-density proportion and coefficient of variation of the lowdensity segment. The wood of the surviving trees is always denser and more heterogeneous. If these adaptive traits are variable and heritable, then it is possible to select for improved resistance to drought in the breeding population as well as in natural regeneration. Our results also suggest that directional selection is going on in more or less water-stressed environments. The direction is variable according to the nature of the selection pressure in the different regions. In the Chapter II, we estimate the evolutionary potential to drought of the introduced Douglas-fir in France. This evolutionary potential relies on the magnitude of the genetic variation and of the heritability of the adaptive traits found in the first chapter. The heritability and the genetic variation are highly variable between provenances, sites and, to a much lower extent, between annual rings. Most variables have moderate to high heritability estimates for at least some provenances in some sites. Some traits tend to have generally higher heritability and genetic variation estimates. These are mostly variables of the density part of the annual ring. The variables having at the same time relatively high estimates of heritability and genetic variation are good candidates for becoming efficient selection traits for resistance to drought in tree breeding as well as in natural regeneration. The significant between-site variation suggests that the heritability estimates increase with site quality. The estimates are also significantly different between provenances with a strong provenance × site interaction. Conversely there is little significant between annual-ring variation. The chapter III takes advantage of the annual-ring variation to study the relationships between the genetic parameter estimates and climatic and soil variables. The heritability and genetic variation estimates of most variables significantly relates with most tested environmental variables. Very few variables never correlates with any environmental variable. The significant relationships are very variable between traits, provenances and sites. The most important predictors are temperature, evapotranspiration, and soil water reserve and water deficit. Rainfall marginally influences the genetic parameter estimates. Generally, the better the growing conditions, the higher the estimates. All components of the experimental trials affect the genetic parameters estimates. Thus, the choice of the plant material and of the experimental site strongly determines the genetic parameter estimates. The uncontrolled climatic variation may randomly affect the estimates
Marques, Renato. „Dynamique du fonctionnement mineral d'une plantation de douglas (pseudotsuga menziesii (mirb. ) franco) dans les monts du beaujolais (france)“. Paris, ENGREF, 1996. http://www.theses.fr/1996ENGR0015.
Der volle Inhalt der QuelleParladé, Izquierdo Xavier. „Técnicas de inoculación de abeto de Douglas (Pseudotsuga menziesii (Mirb.)Franco) con hongos ectomicorrícicos y su aplicación en reforestación“. Doctoral thesis, Universitat Autònoma de Barcelona, 1992. http://hdl.handle.net/10803/32179.
Der volle Inhalt der QuelleEl objetivo principal de este trabajo es la aplicación de técnicas de inoculación de platnas de abeto de Douglas (Pseudotsuga menziesii (Mirb.)Franco) con hongos ectomicorrícicos seleccionados para las condiciones españolas, con el objetivo de mejorar la calidad de planta de reforestación. Primeramente se ha realizado un proceso de selección de hongos por hábitat, especie asociada, capacidad de crecimiento en cultivo y formación de micorrizas in vitro. Sobre un total de 48 cepas probadas pertenecientes a 36 especies, se han seleccionado 32 cepas en 24 especies por su capacidad micorrícica en cultivo puro. Las técnicas de inoculación de plantas producidas en contenedor han incluïdo inóculo vegetativo, miceli incluído en gel de alginato e inóculo de esporas aplicados a distintas dosis. El inóculo vegetativo de Hebeloma crustuliniforme, Laccaria bicolor, L. laccata y Lyophyllum decastes ha resultado efectivo en la formación de ectomicorrizas, con dosis óptimas variables. La producción de micelio incluído en gel de alginato ha mostrado un grado variable de tolerancia de determinados hongos a las concentraciones elevadas de CaCI2 utilitadas para polimerizar el alginato y al almacenamiento en frío. La formación de micorrizas con este tipo de inóculo se obtuvo únicamente con L. bicolor que resultó efectivo a bajas dosis de aplicación. El inóculo de esporas se obtubo principalmente a partir de hongos hipogeos de fructificación regular en plantaciones adultas de abeto de Douglas. Los esporocarpos de Rhizopogon subareolatus y Melanogaster ambiguus proporcionaron un elevado número de esporas que fueron efectivas en la formación de ectomicorrizas a dosis relativamente bajas. Adicionalmente, se ha iniciado el desarrollo de técnicas de inoculaciones dobles con hongos ectomicorrícicos seleccionados. los resultados in vitro han permitido determinar la capacidad colonizadora relativa y la inducción de la formación de raíces cortas de distintas especias de hongos. Los resultados obtenidos en estas condiciones indican que L. Bicolor y R. subareolatus son hongos de elevada capacidad competitiva.Las inoculaciones mixtas en condiciones de contenedor han resultado en una proporción variable de plantas con dos hongos simbiontes coexistiendo en el mismo sistema radicular, dependiendo de la concentración inicial de cada hongo. Finalmente, se ha iniciado el desarrollo de bioensayos con el objetivo de determinar la infectividad natural de suelos de plantación y su receptividad a las distintas especies de hongos introducidas. Los resultados se discuten en relación a su aplicabilidad en el proceso de selección de hongos adaptados a las condiciones ecológicas de las zonas a repoblar.
Elaieb, Mohamed Tahar. „Amélioration de l'imprégnabilité aux solutions aqueuses des duramens des résineux : le cas du Douglas (Pseudotsuga Menziesii Franco)“. Thesis, Université de Lorraine, 2014. http://www.theses.fr/2014LORR0210/document.
Der volle Inhalt der QuelleIn the ten next years, Douglas-fir will be the main softwood resource harvested in France. It its valorization by peeling comes up against two of its particularities that complicate boiling efficiency: (i) the heartwood has a MC near FSP (30 to 40%) i.e. there is near no free water into tracheid (ii) it is impossible to impregnate this heartwood at atmospheric pressure with water. As a result, wood material being a very efficient insulator material, boiling of Douglas-fir prior to peeling for veneer production will take a very long time, free water being the main medium allowing heat transfer into green wood. Wood is a good thermal insulator, free water is generally preferred in the heating operation steaming prior peeling. Heating time in the case of Douglas is doubled or tripled compared to others species. This results in wasted energy and increased immobilization stocks. In order to improve the kinetics of impregnability of Douglas heart wood, we tested a number of methods of impregnating at two different scales. At the bench scale, samples with 20 mm (R) x 20 mm (t) x 120 mm (L) taken from the heartwood, have suffered from various tests by varying the soaking water temperature, duration soaking, the type of cooling. Some terms were repeated by placing the bath in ultrasound (frequency 20 kHz, power 400 W) and others by adding a surfactant in water or to drying samples, (thermal, natural, vacuum) prior impregnation . After each test, the water uptake was quantified by double weighing. We showed a repeatable board effect across all categories but none of them allows a significant improvement in the water uptake heartwood except drying that profoundly improved the moisture content of samples. The transposition to the industrial scale processing on ridges (50 cm long and 20 cm in diameter) showed the effectiveness of prior drying on the ability of wood to be penetrated by the water, but insufficient to significantly improve the peeling conditions. X-ray scanner observations confirm the persistence of the heterogeneity of the moisture distribution across all categories of experiments. The confocal laser scanning microscopy (CLSM) showed that the drying process at 103 ° C, generated microcracks in the cell walls of the pits. The tests performed on the peeling logs from different modalities studied showed no difference in behavior both in terms of cutting forces and quality veneers obtained
Imbault, Nadine. „Analyse des cytokinines dans les pousses en cours de differenciation florale et dans les bourgeons sexues du sapin de douglas (pseudotsuga menziesii (mirb) franco“. Orléans, 1989. http://www.theses.fr/1989ORLE2012.
Der volle Inhalt der QuelleDA, ROS NADIA. „Biologie et impact des insectes specialises dans l'exploitation des cones de meleze, larix decidua mill. , et du sapin de douglas, pseudotsuga menziesii (mirb. ) franco, en italie“. Orléans, 1997. http://www.theses.fr/1997ORLE2006.
Der volle Inhalt der QuelleChauvin, Thibaud. „Adaptation au changement climatique et potentiel évolutif du Douglas (Pseudotsuga menziesii Franco.) : rôle des traits hydrauliques, microdensitométriques et anatomiques du xylème“. Thesis, Paris, Institut agronomique, vétérinaire et forestier de France, 2019. http://www.theses.fr/2019IAVF0003/document.
Der volle Inhalt der QuelleSeveral turn-of-the-20th-century diebacks have shown that French Douglas-fir was vulnerable to drought. Whether the Douglas-fir forests can adapt to the new warmer and dryer climate is a key concern in France. We estimated variation of resistance to cavitation traits of a set of Washington, Oregon and Californian provenances in two common garden experiments located in the south of France. We studied the relationships between resistance to cavitation, xylem microdensity and pit anatomy in the trunk and branches. We found that climatic selection pressure in the natural area has shaped local adaptation for resistance to cavitation, microdensity and pit's anatomy. Inland California provenances tend to be significantly more cavitation resistant, with a denser latewood and safer pits than coastal Californian, then Washington and Oregon provenances. However, we also found significant within region variation that could not be explained by the available climatic data. We found different structure-functions relationships, according to the observation level (tree or provenance) and the tree part (trunk or branch). For example, at the individual level, the most cavitation-resistant trees have branches with denser latewood and smaller pit aperture, while at the provenance level, the most cavitation resistant provenances have less dense wood in both trunk and branches, and safer pits. Overall, we conclude that there is a potential for evolutionary adaptation for resistance to drought in Douglas-fir, available at different levels, individual and provenance. However, in a tree improvement context, the complex network of relationships among the resistance to cavitation, the microdensity and the anatomy traits should be carefully monitored in order to avoid possible unfavourable correlative response to selection
DAOUDI, EL-HASSANIA. „Analyse des polyamines et des acides amines dans les pousses au cours de la periode d'induction florale et dans les bourgeons chez le sapin de douglas (pseudotsuga menziesii (mirb. ) franco)“. Paris 6, 1994. http://www.theses.fr/1994PA066540.
Der volle Inhalt der QuelleLomas, 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.
Der volle Inhalt der QuelleTemel, Fatih. „Persistence and age-age genetic correlations of stem defects in Douglas-fir (Pseudotsuga menziesii var. menziesii (Mirb.) Franco) /“. 1997. http://hdl.handle.net/1957/13660.
Der volle Inhalt der QuelleSchuch, Ursula K. „Frost hardiness of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) seedlings raised in three nurseries /“. 1987. http://hdl.handle.net/1957/11065.
Der volle Inhalt der QuelleOsman, Khalid Amir. „Growth responses of Douglas-fir (Pseudotsuga menziesii [Mirb.] Franco) to defoliation“. Thesis, 1991. http://hdl.handle.net/1957/36230.
Der volle Inhalt der QuelleGraduation date: 1992
Li, Peng. „Genetic variation in phenology of bud and cambial activity in coastal Douglas-fir (Pseudotsuga menziesii var. menziesii (Mirb.) Franco) /“. 1990. http://hdl.handle.net/1957/10955.
Der volle Inhalt der QuelleLi, Peng. „Range-wide patterns of allozyme variation in Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) /“. 1986. http://hdl.handle.net/1957/10951.
Der volle Inhalt der QuelleArellano, 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.
Der volle Inhalt der QuelleAlzugaray, 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.
Der volle Inhalt der QuelleRoth, Brian Edward. „Interaction of seed source, competition and fertility on planted Douglas-fir (Pseudotstuga menziesii [Mirb.] Franco) /“. 1994. http://hdl.handle.net/1957/13615.
Der volle Inhalt der QuelleChatthai, 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.
Der volle Inhalt der QuelleGraduate
Chien, Ching-te. „Plagiogravitropic growth in rooted stem cuttings of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) related to indole-3-acetic acid and cytokinins /“. 1988. http://hdl.handle.net/1957/10502.
Der volle Inhalt der QuelleMcCreary, 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.
Der volle Inhalt der QuelleWithrow-Robinson, Bradford A. „Pruning young Douglas-fir (Pseudotsuga menziesii [mirb.] Franco) in a western Oregon agroforestry setting : changes in tree water relations and effects on forage production /“. 1994. http://hdl.handle.net/1957/11153.
Der volle Inhalt der QuelleHipkins, 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.
Der volle Inhalt der QuelleVisintini, Fabio. „Assessment of two spectral reflectance techniques for the estimation of fuel moisture content, equivalent water thickness, and specific leaf weight in Douglas-fir (Pseudotsuga menziesii (Mirb) Franco) needles“. Thesis, 2010. http://hdl.handle.net/1828/3369.
Der volle Inhalt der QuelleGraduate
Calkin, James D. „Distribution of Oligonychus (Oligonychus) ununguis (Jacobi) (Acari: Tetranychidae) and predator mite species (Acair: Phytoseiidae) on field-grown Douglas-fir (Pseudotsuga menziesii [Mirb] Franco) Christmas trees“. Thesis, 1991. http://hdl.handle.net/1957/38054.
Der volle Inhalt der QuelleGraduation date: 1991
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.
Der volle Inhalt der QuelleCarson, Susanna Lynn. „The biodiversity of flying Coloptera associated with integrated past management of the Douglas-fir beetle (Dendroctonus pseudotsugae Hopkins) in interior Douglas-fir (Pseudotsuga menziesii Franco)“. Thesis, 2002. http://hdl.handle.net/2429/12410.
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