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 59 for “"understory vegetation"”.
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Understory vegetation patterns in oak savannas of the Missouri Ozarks
… variables, scale, and site history. Understory vegetation was sampled in 200 plots on 13 oak savanna sites in the Ozarks. Ordination by detrended correspondence analysis showed sites grouping by rhyolite, cherty dolomite, and limestone/dolomite substrate types. DCA axes correlated …
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An investigation on the potential interactions between colophospermum mopane and its neighbouring understory vegetation
… mainly on the interaction of C. mopane and its understory and nearest neighbour vegetation; the study also considered the response of C. mopane to disturbance and also on the plant-animal interactions; the reproductive strategies of C. mopane also formed part of this current work. The …
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Effects of Ponderosa Pine Ecological Restoration on Forest Soils and Understory Vegetation in Northern Arizona
… include increased numbers of tree stems, reduced understory cover and diversity, and the introduction of invasive, non-native understory species. This study evaluated the coverage and species composition of understory vegetation present in the “cool-season” (late spring and early summer) in a …
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Effects of understory vegetation manipulation on hardwood regeneration recruitment and growth in southern Appalachian forests
… poor development of oak advance regeneration. Understory Vegetation Control was conducted in 1994 in average quality (SI₅₀ 17.7 - 21.9 m for upland oak) southern Appalachian forest stands to determine the effects on oak (<i>Quercus</i> spp.) and maple (<i>Acer</i> spp.) advance seedling …
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Effects of Overstory Retention and Understory Vegetation on Small Tree Height Growth in the Inland Northwest
… This study was designed to collect long-term understory tree growth data under a broad range of conditions, with the objective of separately evaluating the effects of site quality, overstory retention, and understory competition levels on tree height growth. After four years, mean periodic …
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Effects of Overstory Retention and Understory Vegetation on Small Tree Height Growth in the Inland Northwest
… This study was designed to collect long-term understory tree growth data under a broad range of conditions, with the objective of separately evaluating the effects of site quality, overstory retention, and understory competition levels on tree height growth. After four years, mean periodic …
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Estimates of above-ground phytomass and nutrients in the understory vegetation in an Appalachian oak forest in Virginia
… nutrients (N, P, K, Mg and Ca) in four different vegetation types in an Appalachian oak forest in southwestern Virginia. The study area is located at midslope on the southeast aspect of Potts Mountain in four non-contiguous compartments which are to be clearcut and whole-tree harvested in the near …
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Community- and species-level consequences of competition in an unproductive environment: an experimental approach using boreal forest understory vegetation
… The studies were done in a boreal forest understory plant community in the southwestern Yukon. The first study was a traditional neighbour removal experiment. Ten of the most common species were transplanted as seedlings into transects with and without neighbours in a factorial design with …
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Water balance and productivity of a Mediterranean oak woodland : Quantifying understory vegetation impacts by development of a stable oxygen isotope partitioning approach
… losses are high. Hence, understanding seasonal vegetation-soil-water feedbacks is vitally important. This thesis aims at disentangling vegetation impacts on water and carbon cycling of a Mediterranean savanna-type oak woodland. Special focus was laid on the seasonal understory impact on net …
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Destination of Isotopic Nitrogen Fertilizer Under Varying Herbicide Regimes in a Mid-Rotation Loblolly Pine (Pinus taeda L.) Plantation in the Piedmont of Virginia, USA
Mid-rotation fertilization and vegetation control are some of the most common silvicultural treatments in loblolly pine (Pinus taeda L.) plantations in the southeastern United States. Competing vegetation is commonly thought to sequester fertilizer nitrogen (N) and reduce the potential growth …
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A Vegetative Analysis of Hercules Glades Wilderness
… field data was analyzed to determine whether the understory vegetation was a reliable indicator of Ecological Land Types established primarily on the basis of physiography and arboreal vegetation. Though the "cedar glades" did generally group together in the ordination models, no sub-set …
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Birds in Residential Metropolitan New Orleans Neighborhoods and Their Relationships to the Batture and Yard Vegetation
… batture, percent canopy cover, stem counts, and understory vegetation. Surveys were conducted in the spring and summer of 2010. It was found that batture birds, urban birds, and pooled birds all had greater species richness and abundance in the spring in areas with more canopy cover, higher stem …
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Gopher tortoise nest-site selection at burrows and the influence of nest environment on hatching success
… environment around potential nest sites (canopy, understory, and soil) influences gopher tortoise nest-site selection at burrows and 2) how that nest environment both directly (nest microclimate: temperature and moisture) and indirectly (nest characteristics: nest depth, distance from burrow, …
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Crop tree release impacts both the understory and overstory in mixed oak stands of the southern Appalachian Mountains
… study addresses a knowledge gap regarding the understory response to CTR in the Appalachian Mountains of southwest Virginia. An increase in understory species composition and abundance is expected, as CTR increases the availability of light and nutrients to the understory. Increased understory …
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Vegetation community development eight years after harvesting in small streams buffers at the Malcolm Knapp Research Forest
… objectives of this research were to compare the vegetation community composition and structure eight years after harvesting and to explore successional trends among buffer widths at year eight after disturbance and in a chronosequence. A series of small clearcuts were harvested in 1998 in a 70 …
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Influence of fire and habitat on the removal of invasive plant seeds by granivores in longleaf pine savannas
… highest in ecotone habitat, which had greater understory vegetation cover and litter depth than upland habitat. For three of four species, seed removal was highest in ecotone habitat three growing seasons post-fire. While granivores removed seeds of all four species of exotic plants, E. …
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Criteria for Recreation Site Selection on Flood Control Reservoirs-Case Studies
… selection are soils, topography, access, wind, vegetation, land ownership, distribution of the sites, bridges and open-water and cove locations. Once the sites were selected, they were evaluated and assigned priorities for development according to their access, soils, topography, shoreline, …
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Floristic dynamics of Appalachian pine-oak forests over a prescribed fire chronosequence
Vegetation dynamics after prescribed fire were modeled on three mountains in the George Washington National Forest representing a chronosequence of conditions since burning: pre-burn, and 1, 2 and 12 years post-treatment. Vegetation structure was more affected by environmental and spatial (burn …
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Indirect effects between deer, mice, and the gypsy moth in a forest community
… engineers that dramatically alter forest understory vegetation. Consequently, deer can impact many species in a forest through both direct and indirect effects. One species that deer may indirectly affect is the gypsy moth, whose pupae are preyed upon by the white-footed mouse. Through …
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