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 27 for “"fire disturbance"”.
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Fire disturbance and vegetation dynamics : analysis and models
Untersuchungen zur Rolle natürlicher Störungen in der Vegetation bzw. in Ökosystemen zeigen, dass natürliche Störungen ein essentielles und intrinsisches Element in Ökosystemen darstellen, substanziell zur Vitalität und strukturellen Diversität der Ökosysteme beitragen und Stoffkreisläufe sowohl …
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Fire disturbance belowground: untangling consequences for soil food webs and organic matter
… they regulate, are increasingly threatened by fire due to climate, land use, and management changes. Fires can have profound effects on the physical and chemical soil environment, with consequences for soil biological communities. Fires cause mortality of soil organisms during the disturbance …
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Characterizing Boreal Forest Fire Disturbance Boundaries Through Space And Time In Ontario
… but is increasingly threatened by wildland fires, which are becoming more frequent and affecting larger areas due to climate change. In response, this thesis compares wildland fire boundaries derived from vegetation index slopes with those provided by BorealDB a newly developed database that …
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Compounding Fire Disturbance History Encourages Coast Redwood (Sequoia sempervirens) Regeneration and Community Dominance
<p>Disturbance is fundamental to forest ecosystem function and overall health, but climate change is likely to increase both disturbance frequency and intensity in the future. Forests subject to increasingly frequent and intense disturbances are more likely to experience compounding disturbance …
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Coupled Behaviour of Soil and Plant Water Dynamics: Effects of Vegetation Cover, Soil Type and Fire Disturbance
… question: how do vegetation cover, soil type and fire disturbance interact with and affect soil and plant water dynamics? Each factor in this question will be assessed in an individual chapter. First, I assess vegetation cover using a long-term soil moisture dataset, a vegetation index and …
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Spatiotemporal dynamics of carbon cycling and thermokarst in response to climate and fire-regime changes in the Arctic tundra biome
Amplified climate change and fire regime shifts in the northern high latitudes are posing growing threat to key properties and functions of tundra ecosystems, including soil carbon stock, permafrost stability and vegetation types. However, it remains poorly understood how tundra ecosystems will …
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Drivers of spatial and temporal variability in the fire regime of boreal forest in western Russia
Fire is an integral and major control on forest properties and ecosystem functions within the boreal forest. However, significant spatial and temporal variability in fire regimes occurs across this area that may not current be being encompassed in models and predictions of its future, particularly …
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Changes in avian diversity and potential invasive seed dispersal post-wildfire in a Southeastern deciduous forest; Flipper Bend Woods, Signal Mountain, Tennessee
In eastern deciduous forests, fire-disturbance and its ecological implications have not been heavily studied. In Tennessee, a recently burned site (2016) presented a unique opportunity to analyze habitat regrowth two-three years after a major wildfire thought to have been worsened by invasive …
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Root suckering in Dichrostachys cinerea and a comparison of subspecies africana and nyassana
… and the extent of root suckering under different fire regimes, and levels of herbivory. Variations in subspecies distribution are clear. Subspecies africana, with greater structural defenses, survives in areas of high herbivory but is rarely seen under high fire disturbance. The opposite is true …
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Evaluating Geomorphic Change in Little Creek Using Repeated Cross-Sectional and Longitudinal Profile Surveys
… Creek Watershed was burned in the Lockheed Fire. Channel change was evaluated by measuring ground profiles using traditional survey methods. Cross section and longitudinal profiles are surveyed annually every summer in the six study reaches. Change is assessed through evaluation of cross …
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An investigation of nitrogen cycling processes in a coastal fynbos ecosystem in the South Western Cape Province, South Africa
… in these soils. c) The influence of fire disturbance on nitrogen form and concentration in these soils. d) An investigation of the nitrogen mineralization process in these soils in relation to control by physical factors, successional age of the stand and the impact of fire on this …
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Natural regeneration and ecological succession in Pinus kesiya watershed plantations in northern Thailand : implications on plantation management
… trees was negatively affected by forest fire and canopy coverage. A high basal area of mature broadleaved trees affected the regeneration process positively. Forest fire disturbance had a strong effect also on plantation structure and species composition. Because of an unclear future …
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Using Remote Sensing and Biogeographic Modeling to Understand the Oak Savannas of the Sheyenne National Grassland, North Dakota, USA
… including landscape topography, soils, and fire disturbance. Further, I interpret the performance of a suite of advanced Species Distribution Modeling approaches including Maximum Entropy, Random Forest, Generalized Boosted Model, and Classification Tree to analyze the primary environmental …
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A reassessment of the conservation status of a rare Florida endemic mint, Macbridea alba
… to changes in vegetation and dependent on fire disturbance, and despite the viability of seed, could be recruitment or seed limited due to low fruit and seed set across populations. The new findings and updated data can form a more complete picture of conservation needs, improve management …
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Are forests restricted by nutrient poor soils? : an analysis of soil nutrient stocks and associated vegetation in the fynbos biome, South Africa
… although patchy nutrient distribution and fire disturbance are thought to play a role. The issue has been confounded in the recent past by the invasion of non-indigenous woody plants into formerly low stature fynbos dominated areas. Despite low wood nutrient concentrations, a substantial …
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Utilization of the Distributed-Hydrology-Soil-Vegetation-Model (DHSVM) To Quantify Streamflow Changes and Slope Failure Probability Following the Snow-Talon Fire Near Lincoln Montana, USA
… as vegetation, soils, topography, weather and disturbances can influence the hydrology of a watershed. Understanding what is influencing changes in streamflow following fire can be difficult due to lack of data or models running at inappropriate resolution. In dealing with the large spatial …
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Utilization of the Distributed-Hydrology-Soil-Vegetation-Model (DHSVM) To Quantify Streamflow Changes and Slope Failure Probability Following the Snow-Talon Fire Near Lincoln Montana, USA
… as vegetation, soils, topography, weather and disturbances can influence the hydrology of a watershed. Understanding what is influencing changes in streamflow following fire can be difficult due to lack of data or models running at inappropriate resolution. In dealing with the large spatial …
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Investigating Causal Relationships between Global Change and Insect Interaction Networks: Insights into Dietary Specialization, Interaction Diversity, and Disturbances
… gradient in arthropod networks before and after fire disturbance in the eastern Sierra Nevada mountains. I found that a prescribed fire created classic early successional habitat, allowing for random recruitment of arthropods using post-fire plants and detritus. The initial increase in primary …
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Ecological assembly of high-diversity plant communities: dispersal, competition, and environmental filtering in longleaf pine savannas
… that “ecological filters” (competition, disturbance, and resource availability) contribute to niche assembly through their effects on established plant species and recruitment from the species pool. Consistent with dispersal-assembly theory, I found that dispersal from the species pool …
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Fire-driven changes to tree drought vulnerability and carbon storage in temperate broadleaf forests
… Concurrent changes to natural and anthropogenic fire regimes underscore the potential for large-scale impacts on forest ecosystems and carbon cycling. The sensitivity of forests to these changes will require an understanding of tree vulnerability to both drought and fire, yet their interaction is …
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