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 306 for “"understory"”.
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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 Experimental Assessment of Soil-Based Habitat Partitioning in Understory Palms
… My dissertation research established patterns of understory palm community assembly and functional traits in relation to soil gradients in lower montane forests in western Panama and then examined the mechanistic basis of these patterns using seedling transplant experiments. My research showed …
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Effects of nutrient limitation on understory communities in a tropical forest
… and decay-rates between terrestrial ferns and understory palms, since the extent to which their resource needs overlap has not been determined. Furthermore, ferns and palms are two essential components of forest understories that differ widely in physiology and reproductive traits, while …
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Fire and periodical cicadas: impacts on soil nutrients and understory plant germination
<p><strong>Purpose </strong></p> <p>A compound disturbance, composed of a prescribed fire and a periodical cicada emergence, occurred in northern Georgia in the summer of 2021. Independently these disturbances have substantial effects on the surrounding ecosystems. This study investigated the …
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Riparian understory dynamics and relationship to dams on the Elwha River, Washington
… system. I determined the relationships between understory and overstory riparian plant communities and how they vary across geomorphic landforms relative to the dams over a five-year period (2005 to 2010). I also evaluated the relative utility of under- and overstory species as indicators of …
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Growth of Understory Saplings in a Forest Exposed to Elevated Carbon Dioxide
Forests are a major component of the global carbon cycle and will likely be affected by rising atmospheric CO2. The growth response of different tree species varies and depends upon characteristics that enable response to CO2 concentration. The relationship between the sources (e.g., leaves) and …
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Understory Composition, Seedling Growth, and Snag Frequency Across a Water-Limited Forest Landscape
… the second chapter was to compare responses of understory plant communities to soil moisture, nitrogen, and light, and to understand whether responses to soil moisture depend on the latter two. I measured functional traits (individual-level plant characteristics) of understory vascular plants …
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Distribution and Dynamics of the Evergreen Understory Layer in Central Appalachian Highland Forests
Evergreen understory layer communities dominated by Rhododendron maximum L. and/or Kalmia latifolia L. may exert significant controls on regeneration of overstory trees, carbon sequestration, and nutrient retention in central Appalachian forests, but their distribution and ecological importance are …
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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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Foliar Herbivory on Understory Oaks as a Function of Forest Type and Prescribed Burning
Loss of oak seedling and sapling leaf area to insect herbivores has not been well characterized in Ozark forests, but may be a critical variable affecting current and future forest health. This study quantified loss of oak seedling and sapling leaf area to insect herbivores in recently burned or …
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Evaluation of shrub removal effects on understory richness and diversity in a native grassland
Tallgrass prairie is a highly endangered ecosystem in North America, and woody plant encroachment is one of the leading stressors facing prairie remnants. Insights into factors that predict vulnerability and resistance to invasion and information concerning the most effective treatment combinations …
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Trait-based approaches to understanding the response of forest understory herbs to environmental variation
… effects of environmental change on understory herb presence, abundance, and performance across individual, population, and community scales. Specifically, I utilized plant traits in observational, experimental, and population modeling approaches to reveal patterns in understory herb …
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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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ASSESSING THE PERFORMANCE OF SAMPLING DESIGNS FOR MEASURING ABUNDANCE OF UNDERSTORY PLANTS AFTER FOREST RESTORATION
<p>Accurate estimation of the responses of understory plants to natural and anthropogenic disturbance is essential for understanding efficacy and non-target effects of management and restoration activities. However, ability to assess changes in abundance of understory plants that result from …
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ASSESSING THE PERFORMANCE OF SAMPLING DESIGNS FOR MEASURING ABUNDANCE OF UNDERSTORY PLANTS AFTER FOREST RESTORATION
<p>Accurate estimation of the responses of understory plants to natural and anthropogenic disturbance is essential for understanding efficacy and non-target effects of management and restoration activities. However, ability to assess changes in abundance of understory plants that result from …
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Species Composition and Spatial Ecology of Amazonian Understory Mixed-Species Flocks in a Fragmented Landscape
With the ongoing advance of the agricultural frontier in the Amazon basin, it is inevitable that heterogeneous landscapes will play a key role in conservation. These landscapes are mostly composed of patchworks of small forest fragments, secondary forests and roads. Conservation, however must take …
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The influence of an umbelliferous understory on the parasites of organic apple orchards in Canterbury
The influence of a wild parsnip (Pastinaca sativa L.) ground cover on the parasites of organic apple orchards was examined. The indirect influences on the major pest species, codling moth (Cydia pomonella L.) and lightbrown apple moth (Epiphyas postvittana (Walker)) were also investigated. Sampling …
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Assessing colonization and extirpation trends of Illinois understory herbaceous plants using robust-design occupancy models
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2024-08-01
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