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 25 for “"Tree Regeneration"”.
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PATTERNS OF SEEDFALL AND SEEDLING ESTABLISHMENT IN AN EAST TEXAS RIVER FLOODPLAIN FOREST: THE CONTRIBUTION OF SEEDLING DYNAMICS TO SPECIES COEXISTENCE (PLANT DEMOGRAPHY, DISPERSAL, TREE REGENERATION, SURVIVORSHIP, MORTALITY)
… and fungal attack in causing seedling mortality. Tree species fell into two groups on the basis of their demographic characteristics and responses to unfavorable conditions. For heavy-seeded species, of which water oak was the primary example, few seeds were produced, but seedling survival was …
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Native forest tree conservation in tropical agroforests: Case study of cacao farms in the Atlantic Forest of southern Bahia, Brazil
… in agricultural landscapes may depend sapling regeneration of native forest trees in agroforests. In this dissertation, I ask two main questions: are native forest trees regenerating in agroforests and if so, what are the ecological and social drivers? I tested the influence of potential seed …
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Turning up the heat: fire ecology and climate adaptive silviculture in longleaf pine forests
… of longleaf pine woodlands. Longleaf pine regeneration is exposed to this frequent fire, yet persists as both patches and single tree regeneration. While research has shown that this regeneration within patches alters fuel composition, specific changes of fuel loads, and subsequent …
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Ecology and Control of Rhododendron (Rhododendron ponticum L.) in Turkish Eastern Beech (Fagus orientalis Lipsky) Forests
… reduce beech growth and can preclude tree regeneration. The ecological consequence is an aging beech overstory with little or no regeneration to replace the mature trees. Great rhododendron (R. maximum L.) has been increasing in the forests of the Southern Appalachians of the United …
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Variation in tree mortality and regeneration affect forest carbon recovery following fuel treatments and wildfire
… Although fire severity and post-fire tree regeneration have been indicated as important influences on long-term carbon dynamics, it remains unclear how natural variability in these processes might affect the ability of fuel treatments to protect forest carbon resources. We surveyed a …
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Variation in tree mortality and regeneration affect forest carbon recovery following fuel treatments and wildfire
… Although fire severity and post-fire tree regeneration have been indicated as important influences on long-term carbon dynamics, it remains unclear how natural variability in these processes might affect the ability of fuel treatments to protect forest carbon resources. We surveyed a …
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Biotic Interaction of Invasive, Early-Succession Trees and Their Effects on Community Diversity: a Multi-Scale Study Using the Exotic Invasive Ailanthus altissima and the Native Robinia pseudoacacia in the Mid-Appalachian Forest of Eastern United States
… are important to community structure and canopy tree regeneration. To address the type and extent of interactions of these two species, a greenhouse experiment utilizing various species proportions, nutrient levels and seed sources was performed. In addition, a common-garden experiment with …
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Dynamics of two South African floodplain forests
… of riparian forests in Africa, especially tree regeneration requirements, community level patterns and water relations. The major determinants of tree distribution have yet to be fully elucidated for many riverine systems, particularly in tropical areas, and the potential consequences of …
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Aspects of the biology of climbers in southern Africa
… and the influence that climbers may have on the regeneration of forests. The abundance of climbing plants (climbers) was established over a soil nutrient gradient, under standardised light conditions. Abundance was found to be positively correlated with the potassium concentration and the soil …
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Post-fire carbon, fuels, and vegetation dynamics in wet temperate forests: implications for future fire and management in the Pacific Northwest
… specifically focusing on early-seral conditions, tree regeneration, and fuel profiles. I initialized each high severity field plot in the individual-based landscape model, iLand, and simulated 80 years of stand development under two future climate scenarios. I found that pre-fire stand age had …
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The Assessment of habitat condition and consevation status of lowland British woodlands using earth observation techniques.
… evidence of natural turnover (e.g. deadwood and tree regeneration), andanthropogenic influences (e.g.disturbance, damage). Woodland condition assessments are currently conducted via fieldwork, which is hampered by cost, spatial coverage, objectiveness and repeatability.This projectevaluates the …
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The Effects of Prescribed Burning by the National Park Service on Pine -Oak Forests Within Great Smoky Mountains National Park
… prescribed burn and unburned control sites. Pine regeneration was abundant only in the forest at the location receiving the high intensity burn. Available light had a significant relationship with the species composition of tree regeneration. Substantial pine regeneration and recruitment into …
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Long-term patterns of mortality and regeneration in near-natural woodland
1. Long-term patterns of natural regeneration, growth, mortality and disturbance were recorded in six native lowland woods around Britain, using a series of permanent transects/plots established during the 1950-80s. Records were made including the position and status of trees, shrubs, established …
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Post-fire vegetation and bird habitat use in piñon-juniper woodlands
… is supported by a critical mutualism, where the regeneration and infilling of these trees is reliant on several bird species that disperse piñon pine and juniper seeds. This study aimed to assess woodland resilience by evaluating post-fire forest structure and the associated avian communities …
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Adaptive Silviculture in an urban floodplain forest: exploring functional traits and soil responses for climate ready forests
… weedy, competitive, and a hindrance to tree regeneration. Additionally, climate and habitat suitability models project that tree species currently found within MNNRA's floodplain forests will see a reduction in suitable habitat within the region, further underscoring the need to identify …
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Fire, climate, and forest structure in ponderosa pine forests of the Black Hills
… forest stands composted primarily of old, large trees. However, this model may not apply uniformly to ponderosa pine forests in the Black Hills of southwestern South Dakota and northeastern Wyoming. Infrequent, extensive stand-replacing fires also may have occurred and apparently resulted in …
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Spatio-temporal patterns of forest disturbance in western North America: implications for forest resilience
… and spatial arrangement of surviving trees, and that increased post-disturbance growth acts as a key mechanism of forest resilience by providing continuity in forest function. Next, I characterized the patterns and drivers of biotic disturbance hotspots, an emerging phenomenon in the …
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Population-Level Differences in Pinus monophylla Whole-Plant Seedling Strategies Under Varying Precipitation Pulses
… change exacerbates forest mortality, subsequent tree regeneration depends on the presence of functional traits that allow seedlings to survive selective pressures from altered climate regimes. Many widely-distributed plant species exhibit intraspecific trait variation reflecting adaptation to …
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Developing Management Guidelines that Balance Cattle and Timber Production with Ecological Interests in the Black Hills of South Dakota
… relationships between management practices, tree stocking, timber production, forage production, livestock grazing, wildlife, aesthetics, and ecological integrity are not well documented. Whether considering timber or cattle, finding a balance between production and resource conservation is a …
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Causal factors and consequences of mixed-severity fire in Black Hills ponderosa pine forests
… during the Jasper fire. Relative density, tree size, and slope, ranked in order of importance, were influential in predicting burn severity. Relative density < 40 % and slope < 18 % represent critical thresholds where low and moderate severity were more likely to occur. High stand density …
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