Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 32 for “"ring width"”.
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Modeling thinning effects on ring width distribution and wood specific gravity of loblolly pine (Pinus taeda L.)
… addressed in this study: 1) thinning effects on ring specific gravity 2) thinning effects on ring width distribution 3) thinning effects on stem form, and 4) prediction models for these quantities. The study showed that thinning does not significantly affect ring specific gravity, whereas its …
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Dendroclimatology of Pinus sylvestris L. in the British Isles
A study of the properties of tree-ring density and ring-width chronologies from five sites in the British Isles, two in Sweden and two sub-fossil sites in Northern Ireland is described. The technique of x-ray densitometry is used to measure density. It is shown that it is possible to use x-ray …
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Influence of elevation on tree species distribution and growth in the southern Appalachian Mountains
… created for each site. The correlation between ring width index and Palmer drought severity index (PDSI), precipitation and temperature was calculated with each site's master chronology. There was a significant positive correlation between PDSI and ring width index during the growing season for …
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ΕΡΕΥΝΑ ΠΟΙΟΤΙΚΩΝ ΧΑΡΑΚΤΗΡΙΣΤΙΚΩΝ ΤΟΥ ΞΥΛΟΥ ΕΞΙ ΝΕΩΝ ΚΛΩΝΩΝ ΛΕΥΚΗΣ ΣΕ ΣΧΕΣΗ ΜΕ ΤΟ ΓΕΝΟΤΥΠΟ, ΤΗΝ ΗΛΙΚΙΑ ΚΑΙ ΤΗΝ ΤΑΧΥΤΗΤΑ ΑΥΞΗΣΕΩΣ ΤΩΝ
… OF SOME WOOD QUALITY CHARACTERISTICS I.E. RING WIDTH, WOOD DENSITY AND FIBER DIMENSIONS AND TO DETERMINE THE POSSIBILITIES OF IMPROVING WOOD QUALITY IN RELATION TO GENOTYPE, AGE, AND GROWTH RATE. RING WIDTH, WOOD DENSITYAND FIBER DIMENSIONS ARE UNDER MODERATE TO HIGH (H2=0.40-0.74) GENETIC …
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Drought in the Colorado River Basin: Spatiotemporal Analysis using an Edge Detection Filter
… the last half millennium was obtained using tree ring-widths of precipitation sensitive trees as a proxy record of past climatic conditions. A one-dimensional edge detection filter was applied to standardized ring-width indices to identify years with rapid change in ring-width magnitude that may …
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Historical growth rates and changing climatic sensitivity of boreal conifers
… relatively long-timescale growth forcing in tree-ring chronologies. The operation of different standardisation techniques, used in dendroclimatology to remove internal, non-climate related growth trends in measured series of ring-widths, is explored with an emphasis on the efficiency of the …
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Forward modeling of tree-climate relations across the Northern Hemisphere
… thesis uses the Vaganov-Shashkin model of tree ring formation, a multivariate, nonlinear, mechanistic model that directly predicts tree-ring growth using climate data, to simulate tree-ring formation across the Northern Hemisphere. Previous research has shown the model has skill in reproducing …
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The development and application of a technique in dendrochronology
… It relies upon developing relative annual ring-width indices, and identifying unusually high yearly agreement in two or more samples. These agreements in the tree growth ring indices are called key years. Statistical procedures are developed for evaluating goodness of fit among sets of …
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A Dendrochemical Analysis of Lead, Aluminum, and Calcium in Southern Appalachian American Beech.
… including lead, aluminum, and calcium in growth rings of an important northern hardwood species, American beech (<em>Fagus grandifolia</em> Ehrh.) at Mount Rogers and Whitetop Mountain, Virginia. Dominant and codominant trees were sampled from sixteen research plots located at two different …
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An 828 Year Streamflow Reconstruction for the Jordan River Drainage Basin of Northern Utah
… linear regression model created with tree-ring width as the predictor of October - March American Fork River streamflow explained 51.7% of streamflow variance. Analysis of the reconstruction indicates that present records do not adequately represent potential streamflow variability, and …
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Dendrochronology and the study of crannogs.
… of non-oak species with fewer than 50 year-rings, the assemblages required the development of new techniques and approaches. The problem of validating cross-matches between short ring sequences was resolved by a new methodology based on internal consistency. A group of internally consistent …
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A dendrochronological investigation of Pinus radiata from Silvermine Nature Reserve
… assumed to be a limiting factor in tree growth. Ring widths along 82 radii on 41 samples were measured to the closest 0.1 mm. Samples displaying the highest correlation between ring width values were selected to create a growth index chronology for the site. The resulting chronology was compared …
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Effect of Minimum Suppression and Maximum Release Years on Compression Parallel to Grain Strength and Specific Gravity for Small-sized Yellow-poplar (Liriodendron tulipifera L.) Specimens
… or no relationship between specific gravity and ring width or growth rate in yellow-poplar (Liriodendron tulipifera L.). Because most mechanical properties of wood are also closely related to specific gravity, it would thus be of interest to learn how minimum suppression and maximum release …
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Relationships between tree rings and Landsat EVI in the Northeast United States
… activity of vegetation. Networks of tree ring width (TRW) chronologies provide ground-based estimates of annual net carbon (C) uptake in forests, and time series of EVI and TRW may capture common productivity signals. Robust correlations between mean TRW and EVI may enhance spatial …
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Radial growth response of eastern hemlock to infestation of hemlock woolly adelgid
… of this study were to quantify changes in tree-ring width and wood anatomy for trees that survived adelgid infestation, and to contrast dendroclimatic relationships across a latitudinal gradient. Six sites spanning the current range of hemlock woolly adelgid (HWA) infestation were selected. At …
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Development of a simulation model for drying deformation in radiata pine boards
… knot shapes and knot types were illustrated. During drying, moisture desorption in timber results in deformation. In order to use an appropriate partial differential equation for moisture movement in timber, Fick's second law was expanded by further incorporating the effects of mass velocities …
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Radial growth patterns of jack pine in relation to climate, moisture availability, and dwarf mistletoe infection in the Boreal Plains Ecozone of Saskatchewan, Canada
… potential impacts of climate change. I used tree ring and climate data to investigate growth-climate responses of jack pine in infected and uninfected stands, across the regional moisture gradient associated with the boundary of the boreal forest in southern Saskatchewan. I sampled across three …
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Forged in Fire: An anthracological investigation of woodland management and fuel selection for Iron Age metalworking at Culduthel, Invernesshire, UK
… features, qualitative evaluation of growth ring curvature, and quantitative estimations of minimum wood diameter, as well as sequential measurement of ring width. Multivariate statistical techniques were also employed as a mean to detect patterns in large dataset and explore the role of …
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SILVER FIR AND ITS PROVENANCES IN A CLIMATE CHANGE PERSPECTIVE
… Park in natural and planted forests, comparing the growth performance of three provenances of this species in Italy: (a) Western Alpine - (b) Northern Apennine (local) - (c) Southern Apennine. Drought severity was defined by the Standardized Precipitation-Evapotranspiration Index (SPEI). We …
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