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Interaction Of Seed Source Competition And Fertility On Planted Douglas Fir Pseudotstuga Menziesii Mirb Franco
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Book Synopsis Interaction of Seed Source, Competition and Fertility on Planted Douglas-fir (Pseudotstuga Menziesii [Mirb.] Franco) by : Brian Edward Roth
Download or read book Interaction of Seed Source, Competition and Fertility on Planted Douglas-fir (Pseudotstuga Menziesii [Mirb.] Franco) written by Brian Edward Roth and published by . This book was released on 1994 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: The main objective of this study was to evaluate the interaction between herbaceous competition, fertility, and seed source on Douglas-fir survival and growth. A secondary objective was to evaluate the effect of these various factors on the production of lammas shoots and the selectivity of deer browse. Finally, the role of lammas growth in the recovery from deer browsing was examined. Lammas growth, commonly referred to as second flushing, is the precocious flush of growth from the newly formed terminal bud in mid-summer. Weed control was the dominant factor influencing seedling survival and growth, accounting for 49 percent of the explained variation in seedling volume after two years. Weed control significantly conserved soil moisture and resulted in an increased number of seedlings exhibiting a second flush of growth. Fertilization through the addition of nitrogen had no effect when used in conjunction with weed control and had a negative effect when used without the benefit of weed control, Seedlings from the seed orchard source were significantly larger in diameter than the wild type source after two growing seasons, but were of similar height. Of the seedlings which were browsed twice by deer those with the benefit of weed control had over twice the stem volume of those without the benefit of weed control. Lammas growth contributed to the stem volume response to weed control by additional height growth, thus allowing the seedlings to recover from and escape the effects of deer browse.
Book Synopsis The Effects of Seed Source and Planting Environment on Douglas-fir (Pseudotsuga Menziesii) Foliage Diseases by : Nicholas Wilhelmi
Download or read book The Effects of Seed Source and Planting Environment on Douglas-fir (Pseudotsuga Menziesii) Foliage Diseases written by Nicholas Wilhelmi and published by . This book was released on 2016 with total page 169 pages. Available in PDF, EPUB and Kindle. Book excerpt: Douglas-fir (Pseudotsuga menziesii) is a commercially and ecologically important tree species native to western North America. The foliar pathogens Phaeocryptopus gaeumannii, the causal agent of Swiss Needle Cast, and Rhabdocline species, the causal agents of Rhabdocline needle cast, are two important pathogens specific to Douglas-fir. These pathogens are highly influenced by climatic conditions and have been shown to disproportionately affect genetically maladapted populations, causing decreased productivity and sometimes mortality. The relationship between the levels of resistance/tolerance to these foliar pathogens and climate of the population source is a key component in the identification of proper seed sources for reforestation. The Douglas-fir Seed Source Movement Trials (SSMT) is a large provenance study of Westside Douglas-fir which consists of populations and test sites chosen to represent the range of climatic conditions experienced by Douglas-fir west of the Cascade and Sierra Nevada Mountains. We used the SSMT to assess variation in the probability of moderate to severe infection by Rhabdocline spp. and P. gaeumannii, as well as expression of disease symptoms, in relation to climatic differences between test sites and population sources. Using generalized linear mixed models and the probit link function, probabilities were calculated using differences between population source and test sites with respect to the climate variables May through September precipitation (MSP), continentality and mean winter temperature (MWT). Stark differences were observed in side-by-side trees from different seed zones, especially in relation to the resistance to Rhadocline needle cast. No patterns were observed in the infection levels of P. gaeumannii based on number of stomates occluded by fungal reproductive structures. However, there was variation in disease symptom expression such as crown density which was used as a surrogate for Swiss needle cast impacts in this analysis. The transfers of populations from regions of low MSP to test sites of high MSP, cool to warm MWT and high to low continentality are associated with high probabilities of moderate to severe Rhabdocline spp. infection and SNC disease symptoms (low crown density). Trends in high probabilities of disease symptoms and Rhabdocline spp. infection were associated with the movement of populations from south to north. Predictions of disease occurrence based on climate-disease-host seed source interaction indicates danger in choosing trees for assisted migration from drier regions and moving them to wetter areas in anticipation of climate change. This project exemplifies the importance of seed source movement trials in understanding trophic interactions as well as environmental controls on tree growth and adaptation
Book Synopsis Effects of Seed Characters and Competitive Environment on Two-year Performance of Open-pollinated Douglas-fir Families by : John Bradley St. Clair
Download or read book Effects of Seed Characters and Competitive Environment on Two-year Performance of Open-pollinated Douglas-fir Families written by John Bradley St. Clair and published by . This book was released on 1989 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ungerminated seed and recent germinants from 39 open-pollinated Douglas-fir (Pseudotsuga menziesii var. menziesii (Mirb.) Franco) families were planted in each of three competitive environments in order to determine the degree to which growth differences among families are influenced by competitive environment, seed weight, and date of emergence. The three competitive environments were a mixture of individuals from all families planted at a narrow spacing (4x4 cms), single (pure) family blocks planted at a narrow spacing (4xL cms), and individuals from all families planted at a wide, non-competitive spacing (16xl6 cms). Despite some large changes in the relative ranking of families between competitive environments for total dry weight, the family x competitive environment interaction was non-significant (p
Book Synopsis The Effect of Age on Transpiration Rates of Douglas-fir Seedlings (Pseudotsuga Menziesii (Mirb.) Franco) by : Rollin R. Geppert
Download or read book The Effect of Age on Transpiration Rates of Douglas-fir Seedlings (Pseudotsuga Menziesii (Mirb.) Franco) written by Rollin R. Geppert and published by . This book was released on 1968 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this study was to determine the effect of age on rates of transpiration by Douglas-fir seedlings. Seeds were collected from a xeric site (Goldendale, Washington) and a mesic site (Forks, Washington). The seedlings were grown in a cold frame and in a growth chamber for periods of two, four, eight, and sixteen weeks. Although much interaction occurred between age, seed source, and growing condition, significant differences were delineated for each of the three variables. For both the Forks and Goldendale seedlings, the transpiration rates were not found to decrease significantly with increasing age. At a given age, four, eight, or sixteen weeks, the Forks seedlings grown in the cold frame, in general, had the highest rates of transpiration. The effect of seed source was found to be significant when the seedlings were grown in the cold frame. Under these conditions the seedlings from Forks, Washington, had a significantly higher rate than the seedlings from Goldendale, Washington. The effect of conditioning on transpiration resulted in the seedlings grown in a cold frame having a significantly higher rate than those grown in a growth chamber.
Book Synopsis Physiological and Anatomical Studies of Several Groups of Douglas-fir (pseudotsuga Menziesii (Mirb.) Franco) Seedlings which Demonstrated Differential Survival Potential Under Drought Stress by : Terry Charles Heiner
Download or read book Physiological and Anatomical Studies of Several Groups of Douglas-fir (pseudotsuga Menziesii (Mirb.) Franco) Seedlings which Demonstrated Differential Survival Potential Under Drought Stress written by Terry Charles Heiner and published by . This book was released on 1968 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt: Several hundred two year old Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) seedlings were planted in an enclosure designed to permit control of soil moisture. The seedlings came from five seed sources in southern Oregon and one seed source in northwestern Oregon. Mortality terminal and lateral budburst, and soil moisture were recorded during the growing season. The final death count showed that the mortality of the northwest Oregon seed source (84%) differed significantly (at the 1% level) from that of four southern Oregon seed sources (ca 44%) and that the mortality of all differed significantly from that of a fifth southern Oregon source (30%). The purpose of this study was to determine what anatomical, morphological, and physiological characteristics were associated with survival. Root length, calcium-potassium ratio, cuticle thickness, shoot-root ratio, and root surface area are not correlated with mortality. A relation between mortality and the amount and rate of budburst was found. The low bud activity and high mortality of the northwest Oregon seedlings may be an expression of their physiological condition. Earlier bud activity by the southern Oregon seedlings may be a response to a lower minimum temperature, and is a survival advantage in areas with severe summer drought.
Book Synopsis Studies on the Competitive Performance of Outplanted 2+0 Douglas-fir (Pseudotsuga Menziesii [Mirb.] Franco) Through the First Growing Season by : Jack Keith Winjum
Download or read book Studies on the Competitive Performance of Outplanted 2+0 Douglas-fir (Pseudotsuga Menziesii [Mirb.] Franco) Through the First Growing Season written by Jack Keith Winjum and published by . This book was released on with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Comprehensive Dissertation Index by :
Download or read book Comprehensive Dissertation Index written by and published by . This book was released on 1984 with total page 1086 pages. Available in PDF, EPUB and Kindle. Book excerpt: Vols. for 1973- include the following subject areas: Biological sciences, Agriculture, Chemistry, Environmental sciences, Health sciences, Engineering, Mathematics and statistics, Earth sciences, Physics, Education, Psychology, Sociology, Anthropology, History, Law & political science, Business & economics, Geography & regional planning, Language & literature, Fine arts, Library & information science, Mass communications, Music, Philosophy and Religion.
Book Synopsis Comprehensive Dissertation Index: Agriculture by :
Download or read book Comprehensive Dissertation Index: Agriculture written by and published by . This book was released on 1984 with total page 1080 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bibliography of Agriculture written by and published by . This book was released on 1975 with total page 1080 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Harmonisation of Regulatory Oversight in Biotechnology Safety Assessment of Transgenic Organisms, Volume 3 OECD Consensus Documents by : OECD
Download or read book Harmonisation of Regulatory Oversight in Biotechnology Safety Assessment of Transgenic Organisms, Volume 3 OECD Consensus Documents written by OECD and published by OECD Publishing. This book was released on 2010-11-09 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt: These OECD Biosafety Consensus Documents identify elements of scientific information used in the environmental safety and risk assessment of transgenic organisms which are common to OECD member countries and some non members associated with the work.
Book Synopsis Canadian Journal of Forest Research by :
Download or read book Canadian Journal of Forest Research written by and published by . This book was released on 1997 with total page 564 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bibliography of Agriculture written by and published by . This book was released on 1989-08 with total page 742 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Biological & Agricultural Index by :
Download or read book Biological & Agricultural Index written by and published by . This book was released on 1983 with total page 2282 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Bibliography of Agriculture with Subject Index by :
Download or read book Bibliography of Agriculture with Subject Index written by and published by . This book was released on 2000 with total page 536 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Agrindex written by and published by . This book was released on 1991 with total page 796 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis American Doctoral Dissertations by :
Download or read book American Doctoral Dissertations written by and published by . This book was released on 1975 with total page 638 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Douglas-fir (Pseudotsuga Menziessi) by : Harold Scofield Betts
Download or read book Douglas-fir (Pseudotsuga Menziessi) written by Harold Scofield Betts and published by . This book was released on 1960 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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