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 69 for “"fire frequency"”.
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Some effects of fire frequency on fynbos at Jonkershoek, Stellenbosch, South Africa
… on fynbos ecology, with special reference to fire, is presented as an introduction to the thesis. Three post-fire ages of fynbos were studied at the Jonkershoek Forest Reserve, with the aim of determining the effects of fire frequency on the vegetation. The three frequencies investigated were …
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Wildfires in the Cape floristic region : exploring vegetation and weather as drivers of fire frequency
… the spatial and temporal patterns of wildfires in the Cape Floristic Region (CFR). It focused on the factors that influence fire frequency; namely vegetation age, ignition sources and weather conditions. This work was done to aid decisions on fire management in fynbos nature reserves. Fire …
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Effects of fire frequency and seasonality on the population dynamics of the critically endangered Clanwilliam cedar
… is a threatened conifer endemic to the fire-adapted fynbos vegetation of the Cederberg mountains, South Africa. Here its population size has drastically declined, and its conservation status subsequently escalated to critically endangered in 2013 by IUCN Red List of Plants. Studies have …
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The Role of Fire in Montane Forest Environments in the Willamette National Forest, Oregon
… were used to reconstruct a 16,000-year-long fire and vegetation history of the Blair Lake watershed in the Willamette National Forest of Oregon. The record shows that during the late glacial period, overall fire frequency was relatively low. <em>Pinus </em>and <em>Abies </em>were the dominant …
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CONSEQUENCES OF ALTERED BURN REGIMES ON PLANT COMMUNITY DIVERSITY IN THE PINEYWOODS OF EAST TEXAS
<p>The re-establishment of historic fire return intervals is vital to restoring forest health, species diversity, natural succession regimes, and reduction of some invasive species. Studies on the effect of fire frequencies on southern pine understory plant communities have revealed increased plant …
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Demography and leaf physiology of Cornus drummondii in response to disturbance in tallgrass prairie
… attributed to human activities such as decreased fire frequency and increased grazing intensity. Clonal shrubs are of particular concern because of their ability to spread via vegetative reproduction and resprout after fire. The demographic mechanisms that underlie shrub responses to climate …
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Interactive effects of fire and grazing on soil and forage nitrogen dynamics in a tallgrass prairie
Fire and large herbivores are dominant regulators of nutrient cycling in tallgrass prairie ecosystems, yet their combined effects on soil nitrogen (N) dynamics and links to forage quality across heterogeneous landscapes remain incompletely resolved. This thesis examined how fire frequency, grazing, …
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The ecology of congeneric resprouters and reseeders (Hypericum spp.) along fire-frequented pine savanna ecoclines
… Mexico coastal ecoclines where lightning-ignited fires were historically frequent. In this collection of studies, I examine fire responses, habitat associations, distribution limits, and seedling recruitment of <i>Hypericum</i> species along ecoclines in pine savannas of the St. Joe Bay State …
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Changes in distribution of indigenous forest in Table Mountain National Park from 1880-2012
… temperature, precipitation, geology, soils or fire frequency post 1975. These findings indicate that forest patches are influenced by localised ecological factors and suggests a dominant role for other drivers. Historical evidence indicates the key driver of forest expansion is vegetation …
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High-Resolution Record of Vegetation and Climate Change During the Holocene in Southwestern Québec
… 1 460 years for hemlock to recover. The highest frequency of fire activity occurred during the early Holocene, and the lowest in the mid-Holocene. The late Holocene saw an increase in fire frequency, which could be attributed to a drier climate in eastern North America during this period. The …
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Understory vegetation patterns in oak savannas of the Missouri Ozarks
… DCA axes correlated with landscape variables and fire frequency, but correlations were generally weak, suggesting that differences in site history may be important in governing species composition. There was no significant difference between flora lists on cherty-deep to dolomite and …
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The Effects of Wildfire Burn Severity on Bee and Wasp Communities Two Decades Post-Fire
<p>While fire is a natural disturbance in many global ecosystems, anthropogenic changes are affecting fire frequency, severity, and seasonality. Disturbances like wildfire affect bee and wasp communities, but recent meta-analyses are conflicted about whether fire harms or benefits insect …
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A study of bush encroachment in Hluhluwe National Park, using aerial photographs within a GIS framework
… of landscape correlates of encroachment. Fire frequency and the area of forest within 200m of a point in? 1960 were Identified as being the main factors determining which areas had been encroached upon
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A Tree Ring Based Fire History of the Clover Mountains, Lincoln County, Nevada
Fire is a dominant form of disturbance in the American west, and is a primary management concern because of its threat to natural resources and human development. Research on fire history of the Great Basin is lacking. Here I summarize the results of a fire history study in the Clover Mountains of …
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Forest colonization of savannas : patterns and process
… in a South African savanna. I used a 50 year fire experiment in the Kruger National Park to explore patterns of forest colonization in a mesic Terminalia sericea savanna. I studied woody seedling and sapling distribution in relation to different burning treatments, including no burning, and …
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Analysis of long-term changes in populations of the Clanwiliam Cedar (Widdringtonia cedarbergensis) using repeat photography
… class and degree of foliage cover, as well as fire frequency, rockiness of habitat, altitude, aspect of slope, annual mean temperature and annual precipitation for each tree viewed in photosets. Mortality and recruitment events were documented in each of the photosets. A total of 1315 trees …
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Potential key drivers of thicket expansion in savanna
… Data on height growth, root suckering and fire damage were collected for two thicket forming species. A simulation model was developed to evaluate the effect of different biotic and abiotic factors on the spread of a thickerclump in savanna in the Hluhluwe Game Reserve, South Africa. The …
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Fire regime change and the boreal forest carbon cycle from 10,000 years ago to 2100 AD
… role in the global carbon cycle, and wildfire is a key control of boreal carbon dynamics. Rapid high latitude climate change will likely alter boreal fire regimes, potentially disrupting the historical role of the biome as a major sink for anthropogenic carbon emissions. However, the …
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