Bibliografías temáticas / Douglas (Pseudotsuga menziesii Mirb. Franco)

Literatura académica sobre el tema "Douglas (Pseudotsuga menziesii Mirb. Franco)"

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Publicado: 6 de julio de 2024

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Artículos de revistas sobre el tema "Douglas (Pseudotsuga menziesii Mirb. Franco)":

Funk, A., T. A. D. Woods y Sarah J. Hopkinson. "Hormonema merioides n.sp., on Douglas-fir needles". Canadian Journal of Botany 63, n.º 9 (1 de septiembre de 1985): 1579–81. http://dx.doi.org/10.1139/b85-219.

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de Kort, Ingrid. "Relationships Between Sapwood Amount, Latewood Percentage, Moisture Content and Crown Vitality of Douglas Fir, Pseudotsuga Menziesii". IAWA Journal 14, n.º 4 (1993): 413–27. http://dx.doi.org/10.1163/22941932-90000596.

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Relationships between sapwood amount, latewood percentage, moisture content and crown vitality were studied in 171 Douglas firs [Pseudotsuga menziesii (Mirb.) Franco] belonging to different vitality classes. The trees originated from 10 stands in the Netherlands varying in age from 25-70 years.

Hart, V., M. Nentvichová-Hartová y P. Tauchman. "Analysis of herbicide effects on Douglas fir (Pseudotsuga menziesii [Mirb.] Franco) natural regeneration". Journal of Forest Science 56, No. 5 (28 de mayo de 2010): 209–17. http://dx.doi.org/10.17221/77/2009-jfs.

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Douglas fir (Pseudotsuga menziesii [Mirb.] Franco) natural regeneration under parent stand after weed suppression was investigated in the area of the Training Forest Enterprise in Kostelec nad Černými lesy. The study evaluates two measurements made in a two-year interval. The parent stand, where Douglas fir grows in mixture with our domestic tree species, is one of the oldest and most productive stands at the Training Forest Enterprise in Kostelec nad Černými lesy. Herbicides for the control of weeds were applied onto three permanent experimental plots under the parent stand. Measurements done on the plots show a high potential of natural regeneration in areas where the negative impact of forest weeds was suppressed. This conclusion is acknowledged by the high seedling number found on research plots treated with herbicides. The number of Douglas fir seedlings varied from 21,600 per hectare counted on the plot treated with Dominator to 26,650 seedlings on the plot with Velpar treatment even six years after the soil preparation. Statistical analysis confirmed that the seedling number on the plot without any chemical preparation was significantly lower, only 950 individuals per hectare (χ<sup>2</sup> = 926.84, df = 3, P << 0.01).  

Marshall, Valin G. y Hugh J. Barclay. "Response of young Douglas-fir to urea fertilizer applied on and off snow". Forestry Chronicle 70, n.º 3 (1 de junio de 1994): 294–98. http://dx.doi.org/10.5558/tfc70294-3.

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The effects of 200 kg N ha−1 applied as urea fertilizer on 50 cm of snow or on bare ground were studied in an 11-year-old Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) plantation on Vancouver Island. Analysis was done on all trees per plot and on 20 selected dominant trees per plot. Up to 2 years after fertilization, urea significantly increased absolute DBH increments over controls in all trees and the 20 selected trees per plot; response to fertilization on snow was equal to that on bare ground. Between the 3rd and 9th year following fertilization, mean DBH increments were not significantly different for any treatment. Four-year absolute volume increments were 63 and 87% greater than the controls for bare-ground and on-snow applications, respectively. A positive and quantitatively similar response is expected in wetter coastal Douglas-fir stands whether urea is applied on snow or under better conditions during other seasons. Key words: Forest fertilization, season of application, nitrogen, tree response, Pseudotsuga menziesii (Mirb.) Franco

Mondek, Jan y Martin Baláš. "Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) and its role in the Czech forests". Journal of Forest Science 65, No. 2 (5 de marzo de 2019): 41–50. http://dx.doi.org/10.17221/9/2019-jfs.

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The presented study summarizes the results concerning the effects of cultivation of Douglas-fir (Pseudotsuga menziesii (Mirbel) Franco) in the Czech Republic. It focuses on more recent results, published especially in the last decades, it includes also older relevant data. It describes the intensity of production as well as non-production forest functions in the conditions of the Czech Republic. It analyses the research results concerning the volume and value production in comparison with native tree species, also documents effects on soil and herb vegetation diversity in forest ecosystems, and from point of view of stability and cultivation in the last period. Main target is defined by the comparison with the Norway spruce, which can be with advantages substituted partly by this species, with favourable impact on amount and value of the timber production, on the forest soil and ground vegetation biodiversity status. Also the stability of forest stands can be supported considerably. This species represents important alternative to the Norway spruce in lower and middle altitudes and it can contribute considerably to the competitiveness of the Czech forestry.

Mauer, O. y E. Palátová. " Root system development in Douglas fir (Pseudotsuga menziesii [Mirb.] Franco) on fertile sites". Journal of Forest Science 58, No. 9 (23 de octubre de 2012): 400–409. http://dx.doi.org/10.17221/94/2011-jfs.

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The paper analyses the root system development in the artificially established stands of Douglas fir aged 10, 20, 30, 60 and 80 years on aerated soils (Cambisols) without skeleton. On these sites, the Douglas fir develops a uniform root system of substitute taproots and anchors, which has great predispositions to assure the good mechanical stability of trees as well as its resistance to sudden changes in upper soil horizons. Several anchors growing in positive geotropic direction shoot from the stem base, several slant anchors shooting from the side of the stem base turn into the positive geotropic direction of growth. In humus horizons, horizontal skeletal roots shoot from the stem base, which turn into lower soil horizons in an “elbow-pipe” manner and from which shoot positively geotropically growing anchors. Trees of Douglas fir develop this type of root system already at an age of twenty years.  

Kaundun, Shiv Shankhar, Philippe Lebreton y Alain Bailly. "Needle flavonoid variation in coastal Douglas-fir (Pseudotsuga menziesii var. menziesii) populations". Canadian Journal of Botany 76, n.º 12 (1 de diciembre de 1998): 2076–83. http://dx.doi.org/10.1139/b98-187.

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The variability of six Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco var. menziesii) populations was studied with the help of needle flavonoids. Of the two proanthocyanidins and six flavonols detected and measured by high performance liquid chromatography, myricetin and prodelphinidin allowed partial separation of the sampled coastal Douglas-fir populations into three geographical groups. Even though conspicuous differences were found between the northernmost and southernmost provenances, flavonoid markers were insufficient to identify the origin of a coastal Douglas-fir population without ambiguity. In accordance with other genetic markers, it would be inappropriate to recognize races within the sampled area of coastal Douglas-fir. From a biogenetical point of view, the synthesis of prodelphinidin appears to be governed by a gene present in two codominant allelic forms. The alleles are differently expressed from one population to another in such a way that there is a latitudinal cline of prodelphinidin throughout the sampled coastal Douglas-fir populations. The gradual decrease of prodelphinidin from south to north tends to support the idea that coastal Douglas-fir has migrated in this same direction from ice-free refugia of the Wisconsin glaciation period. To confirm the latitudinal cline and the mode of inheritance of prodelphinidin in coastal Douglas-fir, additional populations should be analyzed and segregation data from known pedigrees should be obtained respectively.Key words: Pseudotsuga menziesii var. menziesii, Pinaceae, flavonoids, geographical variation.

Sychra, D. y O. Mauer. "Prosperity of Douglas fir (Pseudotsuga menziesii [Mirb.] Franco) plantations in relation to the shelter". Journal of Forest Science 59, No. 9 (29 de octubre de 2013): 352–58. http://dx.doi.org/10.17221/84/2012-jfs.

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The study evaluates the mortality, growth and qualitative characteristics of Douglas fir transplants planted out on clear-cut areas with different shelter. We assessed 11 clearings situated in the Forest Site Complex 4K – acidic beech (Fagetum acidophilum). The young trees were assessed 3 years after planting for the following parameters: total shoot length, increment, root collar diameter, number of multiple stems, stem curvature, crown form, length of needles, colour of needles and frost damage. The lowest mortality and the best growth of Douglas fir plants were recorded in small, sheltered gaps. Large, unsheltered gaps showed low survival, slower growth and poor vitality of plants.  

Alfaro, René I. y Roy F. Shepherd. "Tree-Ring Growth of Interior Douglas-Fir After One Year's Defoliation by Douglas-Fir Tussock Moth". Forest Science 37, n.º 3 (1 de agosto de 1991): 959–64. http://dx.doi.org/10.1093/forestscience/37.3.959.

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Abstract Reductions in ring width of Douglas-fir, Pseudotsuga menziesii [Mirb.] Franco, trees defoliated for 1 year by the Douglas-fir tussock moth, Orgyia pseudotsugata (McDunnough), are reported. Trees were treated with a nuclear polyhedrosis virus, but the resultant epizootic which killed larvae and reduced defoliation took several weeks to develop and trees sustained varying degrees of damage. No negative effects of defoliation were noted in the year when feeding took place; on the contrary, a growth stimulation occurred. Defoliation levels above 50% resulted in growth reduction for 2 years following defoliation relative to nondefoliated trees. The implications of these growth changes for cost/benefit analysis of control options are discussed. For. Sci. 37(3):959-964.

Pulkrab, K., M. Sloup y M. Zeman. "Economic Impact of Douglas-fir (Pseudotsuga menziesii [Mirb.] Franco) production in the Czech Republic". Journal of Forest Science 60, No. 7 (5 de agosto de 2014): 297–306. http://dx.doi.org/10.17221/27/2014-jfs.

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The article addresses the issues of Douglas-fir (Pseudotsuga menziesii [Mirb.] Franco) production in the Czech Republic (CR). Our analysis shows that the tree species can occupy 149,616–163,713 ha in the CR (with respect to ecological limits set by the Czech legislation). The potential economic effect expressed by the gross yield of forest production might be higher by 27–30 million EUR·yr<sup>–1</sup>.  The results of the analysis support the forest owners’ interest to extend Douglas-fir production in the CR, similarly like it has been extended systematically in all European countries where natural conditions allow.  

Más fuentes

Tesis sobre el tema "Douglas (Pseudotsuga menziesii Mirb. Franco)":

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.

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Seven wood traits: shrinkage (longitudinal, tangential, and radial), relative density, grain angle, tracheid length, and fibril angle, and two growth traits, height and diameter at breast height were analyzed in 413 trees belonging to 48 full-sibfamilies (4 pollen and 12 seed parents) from an 18- year-old coastal Douglas-fir (Pseudotsuga menziesii var. menziesii (Mirb.) Franco) progeny test . Clones from six of the parents also were sampled. Six samples per age level (age levels 0 to 4 along stem radii), with two rings in each age level, were examined in a bolt taken at breast height of the tree for shrinkage and relative density. Smaller sample sizes were used for the other traits. Trends with age from the pith were decreasing longitudinal shrinkage and fibril angle and increasing radial and tangential shrinkage, grain angle, and tracheid length. Relative density first decreased and then increased beyond age level 2. Genetic effects were minimal for wood quality traits except for relative density. Most of the variation for wood quality traits was within tree and between individual trees within families. Genetic correlations between wood quality traits were minimal except between relative density and radial shrinkage, which was positive. Genetic correlations between growth characters like height and diameter at breast height and wood quality traits were also minimal except for relative density and longitudinal shrinkage at early age levels. Selection for increased height can be expected to reduce longitudinal shrinkage and relative density at early age levels, and have virtually no effect on the other traits studied. The results support current efforts to increase wood production through genetic improvement in growth rate by showing that current programs of selection for rapid early height growth will not (with the exception of relative density) result in substantial reductions in several wood quality traits beyond the first few years of tree growth. The demonstrated lack of substantial genetic effects for several traits indicated that genetic improvement can progress more rapidly by concentrating on a much smaller number of traits.
Forestry, 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.

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Fontes, 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.

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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.

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Ce travail avait comme objectif de repondre aux questions concernant l'impact du douglas sur le fonctionnement biogeochimique du sol. L'introduction de cette essence est recente en france et les donnees acquises devraient permettre la prise en compte des contraintes ecologiques dans la gestion de ces peuplements. Les resultats montrent que l'exces de nitrification et la mobilisation consecutive des cations sont les principaux facteurs determinant la composition chimique des solutions du sol. La dynamique liee a l'age des peuplements se traduit au niveau de tous les parametres cles du fonctionnement du systeme (l'absorption foliaire, la recretion, les prelevements radiculaires, les retombees des litieres, les pertes par drainage), mais l'imperfection de la chronosequence (differente occupation historique des parcelles et differentielle roches-meres) complique cependant l'interpretation des resultats. Les bilans entrees-sorties ont mis en evidence l'impact du douglas sur le sol. Les premiers resultats tendent a montrer que ca et secondairement mg sont les elements les plus deficitaires dans les bilans. Les sols s'appauvrissent de maniere importante en ca. Malgre ces bilans deficitaires, les peuplements sont bienvenants, productifs et tres performants en ce qui concerne l'efficience de l'utilisation de n, k et ca et en ce qui concerne le recyclage des elements vers les horizons superieurs du sol. Le systeme n'est actuellement pas durable mais il faudra acquerir des donnees sur les generations futures pour en juger definitivement. Quelle que soit la qualite des observations actuelles, il est tres difficile de prevoir les consequences futures de cette introduction d'essence, sur le l'ecosysteme

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.

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Des bactéries ont été isolées de mycorhizes de L. Laccata-Douglas et de carpophores de L. Laccata et certaines, préalablement choisies, ont été testées pour leur aptitude à stimuler l'infection ectomycorhizienne du Douglas par L. Laccata en conditions axéniques ou non. Les bactéries qui ont stimulé la mycorhization ont été appelées : bactéries auxiliaires de la mycorhization. Ces bactéries ont une action sélective sur le symbiote fongique mais pas sur la plante-hôte. Ces différentes propriétés ont été retrouvées dans des expériences en pépinières forestières ce qui laisse apparaître les éventuelles applications des BAM dans les techniques de mycorhization contrôlée. Ensuite, pour expliquer les mécanismes d'actions des BAM, différentes voies de recherche ont été initiées (production hormonale, enzymatique, effet bactérien sur la croissance saprophytique du champignon)

Ruiz, 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.

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La réponse des arbres à l'augmentation des sécheresses liées au réchauffement climatique dépend de leur capacité d'adaptation, c’est-à-dire de la variation génétique et de l’héritabilité de caractères adaptatifs impliqués dans la résistance à la sécheresse. Dans le chapitre I, nous identifions des proxys facilement mesurables de caractères adaptatifs impliqués dans la résistance à la sécheresse en comparant la microdensité du bois d’individus morts et survivants après la sécheresse de 2003. Les variables les plus discriminantes sont les densités moyennes de segments de haute et basse densité, la proportion du segment de haute densité et le coefficient de variation du segment de haute densité. Les arbres survivants ont toujours une densité plus élevée et des profils généralement plus hétérogènes. Si ces traits sont suffisamment variables génétiquement et héritables, alors il est possible de sélectionner des arbres plus résistants à la sécheresse dans les populations d'amélioration et dans les peuplements forestiers destinés à être régénérées naturellement. Nos résultats suggèrent qu’une sélection naturelle directionnelle pour la densité du bois du douglas se produit dans des environnements plus ou moins limités en eau. Cette sélection agit dans des directions différentes selon les caractéristiques des pressions de sélections subies dans les régions étudiées. Dans le chapitre II, nous évaluons le potentiel d’adaptation à la sécheresse du douglas introduit en France. Ce potentiel d’adaptation dépend de la variation génétique et de l'héritabilité des caractères adaptatifs mis en évidence dans le chapitre I. Nous trouvons une grande variabilité des estimations d’héritabilité et d’AGCV entre variables, provenances, sites et, dans une faible mesure, entre cernes annuels. La plupart des variables possèdent des héritabilités élevées à assez élevées au moins pour certaines provenances dans certains sites. Certaines variables tendent à avoir des héritabilités et AGCV généralement plus élevées : ce sont plutôt des variables de la partie de faible densité du cerne. Certaines variables de résistance à la sécheresse possèdent à la fois une héritabilité et une AGCV élevées : ce sont de bons critères de sélection pour la résistance à la sécheresse en amélioration génétique ou en régénération naturelle. Les estimations différentes entre sites suggèrent que les estimations d’héritabilités augmentent avec le caractère favorable du milieu. Les estimations sont significativement différentes entre provenances, avec de forts effets d’interaction avec les sites. En revanche il y a peu ou pas de différences significatives entre cernes. Dans le chapitre III, nous avons tenu compte de la variation associée aux cernes de croissance pour étudier les relations entre les estimations annuelles de paramètres génétiques et des variables climatiques et édaphiques. Les estimations d'héritabilité et de variation génétique de la plupart des variables de microdensité sont corrélées significativement avec la plupart des variables environnementales testées. De rares variables n’ont montré aucune corrélation significative dans aucun cas. Les caractéristiques des relations significatives sont variables entre les caractères, les sites et les provenances. Les prédicteurs climatiques les plus importants sont la température, l'évapotranspiration, la réserve en eau du sol et le déficit en eau. Les précipitations affectent peu l´estimation des paramètres génétiques. De façon générale, meilleures sont les conditions de croissance, plus élevées sont les estimations. Toutes les composantes des essais expérimentaux modifient les estimations des paramètres génétiques. Certaines peuvent être fortement déterminées par le choix du matériel végétal et du site. D'autres, comme la variation climatique temporelle, sont moins contrôlées et peuvent affecter de façon plus ou moins aléatoire les estimations
Forest 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

Parladé, 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.

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El 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.

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. In 1996 beetle preference shifted to smaller diameter trees with lighter fire injury. Tree size was less significant for predicted attack in 1996 because most large fire-damaged conifers were colonized by beetles in 1995. Beetle populations did not reach outbreak proportions outside the fire boundary, but 53 green trees were also infested in 1997 along the burn perimeter. Log linear tests conducted to quantify beetle emergence supported conclusions that beetles were not only attracted to mature, moderately fire-weakened conifers, but also produced greater brood numbers with up to 60-80 emergence holes/ 1800 cm2. Fire-defoliated trees provided bark beetles with sufficient phloem and limited resistance, allowing beetles to aggregate on areas of viable stem tissue regardless of overall bole char extent.

Chatthai, 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.

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Kantarl, 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.

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Variation in height, dbh and volume was analyzed after 16 years of growth. Results were compared with the 4th and 7th growing season measurements for height. This trial comprised 464 open-pollinated families representing 58 provenances planted at the University of British Columbia Research Forest in Haney, B.C. in 1971. Phenotypic variations between and within provenances, additive genetic variances, heritabilities, genetic gain and juvenile * mature correlations were estimated for the three growth variables according to zone groupings. The effects of provenance by block and family by block interactions were evaluated. Expected reductions from the genetic gain caused by the interactions were calculated. Relationships among growth variables and growth variables versus geographical variables were investigated by simple and multiple linear regression analyses. An attempt was made to classify provenances according to their adaptation to the Haney planting site, on the basis of their performance over the years. Within provenance variation for height was compared among provenances and was related to the geography of origin of provenances. Explanations from the point of evolutionary biology were discussed. High values of calculated genetic gain indicated that significant improvement could be achieved by selection. Age - to - age correlations for height were highly significant (p ≤ 0.01) over time and therefore it was concluded that selection is possible after age 7. However, if we consider the importance of the time factor in improvement, programs, it is feasible to select after age 5. Differential results obtained by regression analysis between height and dbh according to zone grouping suggest that volume will be a better criterion for selection purposes than height alone.
Forestry, Faculty of
Graduate

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Libros sobre el tema "Douglas (Pseudotsuga menziesii Mirb. Franco)":

Gossner, Martin. Diversität und Struktur arborikoler Arthropodenzönosen fremdländischer und einheimischer Baumarten: Ein Beitrag zur Bewertung des Anbaus von Douglasie (Pseudotsuga menziesii (Mirb.) Franco) und Roteiche (Quercus rubra L.). Berlin: Institut für Ökologie der TU Berlin, 2004.

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Osman, Khalid Amir. Growth responses of Douglas-fir (Pseudotsuga menziesii [Mirb.] Franco) to defoliation. 1991.

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Li, Peng. Range-wide patterns of allozyme variation in Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco). 1986.

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Li, Peng. Range-wide patterns of allozyme variation in Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco). 1986.

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Lomas, M. Christine. Physiology and genetics of drought hardiness in coastal Douglas-fir (Pseudotsuga menziesii var. menziesii (Mirb.) Franco) seedlings. 1999.

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Tsai, Ching-Hsiu. Dispersed repetitive sequences in the chloroplast genome of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco). 1989.

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Temel, Fatih. Persistence and age-age genetic correlations of stem defects in Douglas-fir (Pseudotsuga menziesii var. menziesii (Mirb.) Franco). 1997.

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Temel, Fatih. Persistence and age-age genetic correlations of stem defects in Douglas-fir (Pseudotsuga menziesii var. menziesii (Mirb.) Franco). 1997.

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Schuch, Ursula K. Frost hardiness of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) seedlings raised in three nurseries. 1987.

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Li, Peng. Genetic variation in phenology of bud and cambial activity in coastal Douglas-fir (Pseudotsuga menziesii var. menziesii (Mirb.) Franco). 1990.

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Capítulos de libros sobre el tema "Douglas (Pseudotsuga menziesii Mirb. Franco)":

Bastien, Jean-Charles, Leopoldo Sanchez y Daniel Michaud. "Douglas-Fir (Pseudotsuga menziesii (Mirb.) Franco)". En Forest Tree Breeding in Europe, 325–69. Dordrecht: Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-6146-9_7.

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Goldfarb, B. y J. B. Zaerr. "Douglas-Fir [Pseudotsuga menziesii (Mirb.) Franco]". En Trees II, 526–48. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-61535-1_28.

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Owens, John N. y Sheila J. Morris. "An Ultrastructural Study of Fertilization in Douglas Fir [Pseudotsuga menziesii (Mirb.) Franco]". En Sexual Reproduction in Higher Plants, 339–44. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-642-73271-3_54.

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Nagmani, R., M. A. Johnson y R. J. Dinus. "Effect of Explant and Media on Initiation, Maintenance, and Maturation of Somatic Embryos in Pseudotsuga Menziesii (Mirb.) Franco (Douglas-fir)". En Woody Plant Biotechnology, 171–78. New York, NY: Springer US, 1991. http://dx.doi.org/10.1007/978-1-4684-7932-4_17.

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Chanway, C. P., R. A. Radley, F. B. Holl y P. E. Axelrood. "Effect of Bacillus strains on growth of pine (Pinus contorta Dougl.), spruce (Picea glauca Voss.), and Douglas-fir (Pseudotsuga menziesii (Mirb. Franco)". En The Rhizosphere and Plant Growth, 366. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3336-4_77.

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Actas de conferencias sobre el tema "Douglas (Pseudotsuga menziesii Mirb. Franco)":

Ballian, Dalibor y Mirzeta Memisevic Hodzic. "Carbon Binding of Different Provenances of Douglas fir (Pseudotsuga menziesii Mirb. Franco)". En 3rd International Congress on Engineering and Life Science. Prensip Publishing, 2023. http://dx.doi.org/10.61326/icelis.2023.46.

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Forest tree species are very important in terms of carbon sequestration. Trees store 50% to 75% of the carbon they take up from the atmosphere in their wood, and the rest is released back into the atmosphere during respiration. Douglas fir is forest tree species native to North America, but shown successful growth and high productivity and quality in Europe. Douglas-fir is also considered as a species with high carbon sequestration, with the yearly average carbon storage of 46,46 kg CO2/year and for this reason it is increasingly popular as a tree for planting. This research aims to select the best provenances of Douglas fir for carbon sequestration in the provenance test in Bosnia and Herzegovina. Material for this research were Douglas fir trees in provenance test in Bosnia and Herzegovina, locality Batalovo brdo near Sarajevo. The provenance test was established in 1966. by planting 2+2-year-old seedlings, and included 5 provenances from Washington, Oregon and Canada, and from altitudes of 150-900 m above the sea. Heights and diameter at breast height of 52-year-old trees were measured, and volumes of trees were calculated. The results showed that the lowest average volume had provenance from the altitude of 900 m, 83-3.0 (0.7313 m3), and the highest provenance from 300 m, 65-1,0 (1.3410 m3). If there are 625 trees per ha, provenance 83-3,0 would produce 457 m3/ha, and provenance 65-1,0 838 m3/ha, which indicates differences in carbon sequestration. The obtained results can be used in selection of provenance for using in introduction of Douglas fir in Bosnia and Herzegovina.

Levin, Il'ya. "DEVELOPMENT OF PSEUDOTSUGA MENZIESII (PSEUDOTSUGA MENZIESII (MIRB.) FRANCO) ON THE TERRITORY OF THE ARBORETUM OF THE KHRENOVSKOY FOREST COLLEGE". En FORESTRY-BIOLOGICAL FOUNDATIONS OF SUSTAINABILITY OF NATURAL AND ARTIFICIAL PHYTOCOENOSES. FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov, 2024. http://dx.doi.org/10.58168/fbfsnap2024_113-118.

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In order to solve the problems of preserving the ecological potential in protective forests of the forest-steppe region of the European part of Russia, it is envisaged to develop and apply technologies that ensure the preservation of ecological functions of forests and their biological diversity, where the introduction of introduced species is allowed during afforestation. In order to study the development of Pseudotsuga menziesa as an introduced species in the forest-steppe region of the European part of Russia (on the example of the arboretum of the Khrenovskoy Forest College of the Voronezh region), studies were carried out, which revealed: its high wood stock (681.4 m³/ha) and healthy vital state (94.1%) with the degree of damage to the plantation 5.9% and revealed the features of development. Hence, the following conclusion should be considered: based on further studies of the ecological and biological potential of the species, its introduction into production should be ensured in order to obtain sustainable biodiversity in plantations and agrolandscapes, especially in the forest-steppe and steppe zones of the southern Russian Plain.