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 23 for “"Stand dynamics"”.
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Stand Dynamics in a Southern Appalachian Montane Pine Barren, Warm Springs Mountain, Virginia
Virginia's only montane pine barren, located in the Warm Springs Mountain Nature Preserve in the Allegheny Highlands of western Virginia is likely threatened by successional changes initiated by a history of fire suppression. Dominated by early successional fire adapted species, such as dwarfed …
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Stand dynamics, growth, and yield of genetically enhanced loblolly pine (Pinus taeda L.)
… result in significant changes in loblolly pine stand dynamics. Height-age relationships, height and diameter relationships and distributions, and intraspecific competition were investigated in second generation open-pollinated, controlled-pollinated, and clonal loblolly pine with an objective of …
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Fire and stand dynamics in different forest types of the West Khentey Mountains, Mongolia
… historischer Feuerregime und der Bestandesstruktur und -dynamik verschiedener Waldgesellschaften im nordwestlichen Khentey Gebirge, Mongolei. Hierbei wurden die Baumartenzusammensetzung, Regeneration, radiale Durchmesserzuwächse und die Zusammensetzung sowie der Zustand des stehenden …
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Growth and stand dynamics of Red maple-dominated forests in the Upper Great Lakes Region, USA
… Climate change and associated impacts on forest dynamics are expected to increase red maple relative importance in the Upper Lake States and New England. However, red maple lacks commercial importance and has thus received little attention in growth studies and little is known of the dynamics of …
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Chinese Tallow Long-Term Impact on Stand Dynamics in a Bottomland Hardwood Forest Following Vegetation Management
… examined Chinese tallow and native tree stand structure. Each native and Chinese tallow plot included three sets of nested subplots. The nested subplots include one overstory, one sapling, and four seedling subplots. R (v4.3.3) software was used to run repeated measures analysis of …
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Stand dynamics and disturbance history of five oak -dominated old -growth stands in the unglaciated Appalachian Plateau
Stand dynamics and disturbance histories of five eastern, oak-dominated old-growth stands were investigated using ecological field sampling techniques, dendrochronologogical methods, and a review of historical resources of original forest composition and patterns of human and natural disturbance. …
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Stand dynamics and gas exchange in loblolly pine and hardwood seedling stands: impact of elevated carbon dioxide, water stress and nutrient status
… pine (<u>Pinus taeda</u>) occurs in mixed stands with hardwood species including red maple (<u>Acer rubrum</u>) and sweetgum (<u>Liguidambar styraciflua</u>) across much of the southern United States. Rising atmospheric CO₂ concentrations over the next several decades could influence …
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Long-Term Study of Prescribed Fire Effects on Stand Dynamics and Oak Regeneration Potentials in Degraded Upland Oak-Hickory Stands in Northwestern Arkansas
… was caused by predisposing (e.g., mature, dense stand conditions), inciting (i.e., drought), and contributing (e.g., red oak borer, <em>E. rufulus </em>H., outbreak) factors. Immediately following onset of the decline, substantial crown dieback and tree mortality, particularly for two red oak …
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Interacting effects of soil nitrogen supply and light availability on understory sapling growth and foliar attributes
… receive less consideration in describing stand dynamics. My primary hypothesis is that light and soil N availability have species-specific effects on photosynthetic activity and growth, and that together these resources will better define understory development in complex forests. To test …
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Modelling inter- and intra-specific competition effects in loblolly pine (Pinus taeda L.) plantations
… effects is an essential step in building any stand growth simulator. However, accurate modelling of competition effects depends upon a clear understanding of quantitative relationships of various aspects of stand dynamics, including distributional parameters and spatial statistics. This study …
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Stand Strucuture of Planted Stands in Storm-Water Retention Basins
… sources of water removal, and determining stand structure and leaf area of forests can be a measure of their effectiveness. The structure of forest stands on these basins managed for runoff mitigation has received little attention. We investigated the structure and species …
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Monitoring the Knysna forest : species, community and forest responses
… forests which results in an urgent need to understand any effects that these change factors have on forest ecosystems. We investigate evidence for change in the old growth Lilyvlei Nature Reserve by monitoring growth and dynamics at various levels by examining a 20 year record of tree growth and …
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Basal Area Growth and Crown Dynamics in a Loblolly Pine Spacing Trial
… can be used to determine whether or not a stand has reached the culmination of basal area growth; however, more readily available information on spacing and site index can be used to make the same prediction. The results of this study might be most useful to modelers of early stand dynamics …
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Diameter Distributions of Juvenile Stands of Loblolly Pine (Pinus taeda L.) with Different Planting Densities
… of inter-tree spatial dependency in a particular stand were applied. Empirical semivariograms were derived for each plot over all ages to enable spatial trend recognition. Moran's I and Geary's C coefficients were estimated for ground-line diameters from ages 2 to 5, and for breast height …
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A Denroecological Analysis of Disturbance of Remnant Pinus Palustris, Southeastern Virginia
… and Coastal Plain of Virginia in pure and mixed stands, covering 607,000 hectares. This forest type has since been reduced to 81 hectares or 0.01% of its former range. Around 5,000 individual Pinus palustris remain on six sites in the coastal plains. Seacock Swamp and Everwoods are both sites …
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Clearcut Solutions? An Evaluation of Partial Harvesting in the Black Spruce Boreal Forest
… little research has examined post-harvest stand development, a critical determinant both of habitat and timber supplies.I used a chronosequence approach in combination with dendroecological techniques, a neighbourhood modelling framework, and maximum likelihood statistical methods to …
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Development of soil lead and tree-ring methods for characterizing atmospheric deposition gradients and subsequent tree growth responses
… through time. While a limited sample size and stand dynamics overwhelmed the ability to detect any growth response within the Liriodendron or Betula study sites, I did discover a strong negative relationship between the deposition gradient and Picea growth in the central Appalachian Mountains …
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Factors associated with Atlantic white -cedar seedling recruitment on microtopographic and landscape scales, Brown Mill Pond, Rye, New Hampshire
… in order to determine associations between stand dynamics and hydrology.</p><p>A field survey showed that cedar seedlings were (1) absent from hummocks with tussock sedge substrate and present on hummocks with moss or litter substrate, (2) most frequent 10--25 cm above the July water table, …
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A decisionmaking framework for assessing atmospheric deposition impacts on regional forest inventory
… of the individual effects of input variables on stand growth and yield. The timber consumption model was linked with TRIM to simulate the interactions between timber removals and inventory levels. Algorithm analysis, sensitivity analysis, and an a priori analysis were used to examine the …
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Building a better burn: Fuel characterization and fire effects in silvicultural systems in the southern United States
… Fire regime alterations influence shifts in stand dynamics via multiple processes, including tree mortality and or regeneration. Over time, these alterations to stand composition and structure further modulate the characteristics of surface fuels. Therefore, understanding how the interactions …
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