• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 32
  • 8
  • 6
  • 2
  • 1
  • Tagged with
  • 58
  • 58
  • 21
  • 15
  • 12
  • 11
  • 10
  • 9
  • 9
  • 8
  • 8
  • 8
  • 7
  • 7
  • 6
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
21

Learning to Burn, Burning to Learn: Transforming Professionals and Organizations through the US Fire Learning Network

Butler, William Hale 21 August 2009 (has links)
Since the 1970s, the institution of fire management has been in a frustrated transition from fire suppression and control to ecologically informed fire management. Administrative boundaries, professional specializations and organizational incentives and funding mechanisms have stalled the adoption of landscape scale ecological fire restoration as a guiding paradigm. Using a case study approach, this dissertation examines the potential of a multi-scalar collaborative network, the US Fire Learning Network (FLN), to catalyze the changes necessary to overcome the frustrated transition. Established in 2002 in an agreement between the USDA Forest Service, The Nature Conservancy, and the US Department of Interior, the FLN operates at landscape, regional and national scales. In this multi-scalar context, the network utilizes planning technologies, communication modalities, and interpersonal interaction to link participants at each scale and motivate them to enhance their collaborative ecological restoration planning capacities. The network directly addresses the challenges of the frustrated transition by enabling practitioners to collaborate across administrative and disciplinary boundaries, develop expertise in ecological fire restoration planning and management, and to inform policy changes at the federal level that can create new incentives and funding mechanisms that support landscape scale ecological restoration. While institutional transformation has yet to occur, the FLN sets the stage to address the core challenges that fire management practitioners and organizations face as they engage in landscape scale ecological fire restoration. This work provides theoretical and practical insights to collaborative planning research by introducing new forms of collaborative practice, describing how collaborative planning can be conducted across multiple scales simultaneously, and establishing how multi-scalar collaborative networks may be able to catalyze institutional change necessary to respond to complex cross scalar environmental problems. / Ph. D.
22

Biophysical and anthropogenic contributions to fire disturbance dynamics on the peat-swamp landscape, Indonesia

Cattau, Megan E. January 2016 (has links)
Fires have been increasing in size and frequency across the tropics in recent decades, particularly in tropical peatland areas. Indonesia has the largest amount of tropical peat carbon globally. Fires in fuel-rich tropical peatlands are a major source of carbon emissions, have serious consequences for human health, destroy or degrade habitat, and result in high economic costs. There have been many calls for a better understanding of the relative contributions of the biophysical and anthropogenic factors that drive fire, as this understanding would contribute to the success of efforts to reduce these fires. This dissertation uses remote sensing, fieldwork, and modeling to explore the dynamics of fire disturbance in Indonesia and investigates this disturbance from the framework of coupled human and natural systems, where complex interactions between the social and the biophysical are explicitly considered. Chapters One and Two assess both the influence of various human and biophysical factors to fire probability (Chapter One) and ignitions (Chapter Two) on a peat-swamp forest area in Central Kalimantan, Indonesia, equivalent to a third of Kalimantan's peatland area. A Bayesian modeling approach is used in Chapter One to estimate the effects of atmospheric dryness, human access, vegetation, and hydrology on the probability of fire occurrence. The potential for peatland restoration to offset the impacts of climate on fire occurrence is also explored. I find that climate is the most important factor driving fire occurrence, which is consistent with the findings in many other parts of the tropics. However, two human-driven factors are almost as significant as the influence of climate: drainage canals, which were put in place as part of a failed agricultural project and have lowered the water table; and woody vegetation, which has decreased over time. Chapter Two inspects the oft-asserted claim that escaped fires from oil palm concessions and smallholder farms near settlements are the primary sources of fire ignitions. We evaluate fire origin and spread, and find that most fires originate in non-forest, compared to oil palm concessions, and relatively few originate close to settlements. Moreover, most fires started within oil palm concessions and in close proximity to settlements stay within those boundaries. However, fire ignition density in oil palm concessions and close to settlements is high. Furthermore, increased anthropogenic activity in close proximity to oil palm concessions and settlements produces a detectable pattern of fire activity. These results refute the claim that most fires originate in oil palm concessions, and that fires escaping from oil palm concessions and settlements constitute a major proportion of fires in this study region. However, there is a potential for these land use types to contribute more substantially to the fire landscape if their area expands. Chapter Three examines the potential for the financial incentive mechanism of Roundtable on Sustainable Palm Oil (RSPO) certification, which prohibits the use of fire on certified concessions, to reduce fire activity on oil palm concessions. We examine if RSPO-certified concessions have reduced fire activity in Sumatra and Kalimantan, the leading producers of oil palm both within Indonesia and globally. We also evaluate if this pattern changes with increasing likelihood of fires. These questions are particularly critical in fuel-rich peatland areas, of which approximately 46% was designated as oil palm concession as of 2010. We find that fire activity is significantly lower on RSPO certified concessions than non-RSPO certified concessions when the likelihood of fire is low (i.e., on non-peatlands in wetter years), but not when the likelihood of fire is high (i.e., on non-peatlands in dry years or on peatlands). These chapters advance our understanding of how anthropogenic factors influence the controls of fire in Kalimantan and Sumatra, both directly (i.e., human-caused ignitions) and indirectly (i.e., changing the susceptibility of the landscape to ignitions and to burning). The findings presented in this dissertation indicate that oil palm concessions are associated with high fire probability (Chapter One) and a substantial amount of ignitions and relatively high ignition density (Chapter Two). One of the more pointed ways to target fire on oil palm concessions is through RSPO certification; however, we find that certification is only effective when fire likelihood is already low, suggesting that, in order for this mechanism to reduce fire, more assistance may be needed to control fires in dry years and on peatlands (Chapter Three). Non-forested, degraded areas contribute much more to fire activity than oil palm on this landscape; these areas experience the greatest number of ignitions, have highest ignition density, and are the primary source of forest fires (Chapter Two). Furthermore, the declines in vegetation and the hydrological alteration in these degraded areas contribute substantially to fire occurrence (Chapter One). Effective fire management in this area, including fire prevention and suppression efforts, should therefore target not just oil palm concessions and smallholdings around settlements, but should also focus strongly on non-forested, degraded areas – and in particular those near oil palm concession boundaries and outside the immediate vicinity of settlements – where fire probability is high and where ignitions and fires escaping into forest are most likely to occur. Rehabilitation of the degraded landscape through restoring hydrology and replanting will be key to fire reduction, and can offset the effects of climate on fire in this landscape. The methodological approaches in this dissertation demonstrate ways in which remote sensing and analytical technologies can be used to answer complex questions about coupled human and natural systems that fuse social and environmental data, for both theoretical and management applications. Chapter One uses biophysical information from remotely sensed products and fieldwork with information about human access on the landscape and integrates them together with Moderate Resolution Imaging Spectroradiometer (MODIS) Active Fire detections under a Bayesian framework. Chapters Two and Three use a novel technique to cluster remotely sensed data on fire occurrence (MODIS Active Fire detections) into fire events so that ignitions can be isolated. This technique allows us to answer questions related to fire origin, spread, and impact that cannot be investigated by evaluating fire detections alone. This dissertation addresses a gap in knowledge regarding the anthropogenic contributions to increased fire probability and to ignitions in peat swamp, and the approaches could be applied to other degraded peatland areas in Indonesia that are candidate sites for restoration (e.g., under the newly established Peatland Restoration Agency), and to degraded peatlands that experience a novel fire regime in other parts of the tropics. Furthermore, this dissertation evaluates the capacity for RSPO certification to reduce fire activity on oil palm concessions across Sumatra and Kalimantan, Indonesia, and the analyses conducted could be applied to landscapes in other parts of the tropics experiencing oil palm development. In conclusion, the research findings presented in this dissertation are a product of combining social and environmental data and evaluating this data with a suite of classic and novel modeling approaches. This dissertation is presented in the hope that it contributes to our understanding of fire dynamics in the globally important peat-swamp forest, Indonesia, and thus our capacity to manage these disturbances.
23

Effects of Prescribed Fire on Timber Quality and Tree Value in the Central Hardwood Region

David Paul Mann (7471193) 17 October 2019 (has links)
<div>Prescribed fire is one of the most useful tools available to forest managers attempting to maintain oak-hickory forests in the Central Hardwood Region. Prescribed fire can be useful in promoting regeneration of desirable species groups like oak (Quercus spp.) and hickory (Carya spp.) by preparing the seedbed, managing competition, and creating canopy gaps. The use of prescribed fire has been limited by concerns regarding the effect of the practice on standing timber. A perception of strong negative effects to tree-quality and tree-value from fire originated largely from sometimes deleterious effects of wildfire on timber. Less research exists demonstrating the potential effects of controlled, prescribed burning on timber quality and value. Furthermore, most research that exists focuses on individual tree characteristics, and is often focused on a relatively small geographic areas.</div><div><br></div><div>I conducted a regional study on the effects of prescribed fire on timber quality across a gradient of the Central Hardwood Region, ranging from the Missouri Ozarks to the Appalachian foothills. I studied 139 stands in selected prescribed fire units and control sites in Mark Twain National Forest (MO), Hoosier National Forest (IN), Wayne National Forest (OH) and Daniel Boone National Forest (KY). Selected stands were dominated by hardwoods species and had variable prescribed fire histories, ranging from 0 to 6 prescribed fires. </div><div><br></div><div>Measurements were taken concurrently across this plot network for two studies. First, we assessed the estimated effect of prescribed fire on stumpage value, and secondly, we assessed wounding patterns and effects of prescribed fire on tree-quality. Loss in estimated stumpage value from prescribed fire averaged approximately 4.2% across all measured stands. Estimated loss in stumpage value varied significantly by the number of prescribed fires in the last 30 years, with increasing numbers of prescribed fires leading to higher estimated losses in stumpage value. Further, stands in Mark Twain National Forest exhibited higher estimated loss in stumpage value, exceeding 10% on average. Stands in Hoosier, Wayne, and Daniel Boone National Forest only rarely exceed 5% losses in estimated stumpage value, and averaged less than 3%. </div><div><br></div><div>Approximately 25% of trees had at least one wound associated with prescribed fire across all study sites, while approximately 5% of trees experienced a reduction in tree quality (as measured by United States Forest Service tree grade) from prescribed fire. Both the rate of wounding and rate of tree grade reduction increased with increasing numbers of prescribed fires. Stands in the western portion of the Central Hardwood Region (Hoosier and Mark Twain National Forest) exhibiting higher rates of wounding from fire compared to eastern sites (Wayne and Daniel Boone National Forest.)</div><div><br></div><div>Effects of wounding varied significantly by type of wound. Catfaces accounted for far more volume loss and reduction in tree grade than any other wound type. Alternatively, some wound types, like seams and bark slough, caused minimal tree-quality and tree-volume effects. Effects also varied by species, with higher wounding effects on sugar maple and red oak, and relatively low effects on white oak and yellow-poplar. </div><div><br></div>
24

Using place attachment to determine the acceptability of restoring fire to its natural role in wilderness ecosystems

Turbeville, Eric Paul. January 2006 (has links)
Thesis (M.S.)--University of Montana, 2006. / Title from PDF t.p. (viewed on Mar. 14, 2007). Includes bibliographical references (p. 112-117).
25

Adaptive governance for fire management planning : a case study on Prince Albert National Park, Saskatchewan

Almstedt, Ǻsa 25 November 2010
Fire is a natural ecological process in the boreal forest, but also a threat to human lives, properties and other values at risk. The challenge is to find a way to manage fire where both the positive and negative aspects of fire are effectively balanced. This is especially important since more frequent and intense wildfires are predicted in the future due to climate change. There is also a need for increased cooperation across jurisdictions to improve the efficiency and effectiveness of Canadian fire management. To address the current and future challenges of fire management, this thesis argues that an effective and adaptive governance approach is needed.<p> The purpose of the study was to develop principles, criteria and indicators of adaptive governance and to apply this framework to fire management planning in Prince Albert National Park (PANP), Saskatchewan. Because of the need to include other agencies with fire responsibilities, the study also focused on the interagency cooperation with Saskatchewan Environment (SE), the provincial ministry responsible for wildfires.<p> Principles, criteria and indicators of adaptive governance were identified based on literature on good governance, adaptive management, adaptive governance, and wildfire specific literature. A qualitative research approach was then used to collect data mainly through semi-structured interviews with representatives from Parks Canada (both from PANP and at the national level) and SE, and document analysis of fire plans and strategies.<p> This study shows that many aspects of adaptive governance have already been implemented in PANP, so that principles and criteria of inclusiveness, legitimacy, foresight, leadership, and many aspects of performance-oriented and adaptiveness have been at least partially met. Yet, there is a need to improve information-sharing and communication, especially across jurisdictions. In terms of the interagency cooperation between PANP and SE, having different mandates is the biggest challenge, but it does not prevent cooperation. Throughout the years both agencies have worked out ways to deal with differences in their mandate and fire management strategies. Having a dialogue to try to understand each other�s mandate and respect each other has been and continues to be a key factor in the cooperation. Finally, maintaining and retaining social capital may be crucial to future success in fire management planning, both from an intra- and from an interagency perspective.
26

Adaptive governance for fire management planning : a case study on Prince Albert National Park, Saskatchewan

Almstedt, Ǻsa 25 November 2010 (has links)
Fire is a natural ecological process in the boreal forest, but also a threat to human lives, properties and other values at risk. The challenge is to find a way to manage fire where both the positive and negative aspects of fire are effectively balanced. This is especially important since more frequent and intense wildfires are predicted in the future due to climate change. There is also a need for increased cooperation across jurisdictions to improve the efficiency and effectiveness of Canadian fire management. To address the current and future challenges of fire management, this thesis argues that an effective and adaptive governance approach is needed.<p> The purpose of the study was to develop principles, criteria and indicators of adaptive governance and to apply this framework to fire management planning in Prince Albert National Park (PANP), Saskatchewan. Because of the need to include other agencies with fire responsibilities, the study also focused on the interagency cooperation with Saskatchewan Environment (SE), the provincial ministry responsible for wildfires.<p> Principles, criteria and indicators of adaptive governance were identified based on literature on good governance, adaptive management, adaptive governance, and wildfire specific literature. A qualitative research approach was then used to collect data mainly through semi-structured interviews with representatives from Parks Canada (both from PANP and at the national level) and SE, and document analysis of fire plans and strategies.<p> This study shows that many aspects of adaptive governance have already been implemented in PANP, so that principles and criteria of inclusiveness, legitimacy, foresight, leadership, and many aspects of performance-oriented and adaptiveness have been at least partially met. Yet, there is a need to improve information-sharing and communication, especially across jurisdictions. In terms of the interagency cooperation between PANP and SE, having different mandates is the biggest challenge, but it does not prevent cooperation. Throughout the years both agencies have worked out ways to deal with differences in their mandate and fire management strategies. Having a dialogue to try to understand each other�s mandate and respect each other has been and continues to be a key factor in the cooperation. Finally, maintaining and retaining social capital may be crucial to future success in fire management planning, both from an intra- and from an interagency perspective.
27

Maintaining a hill prairie ecosystem

Stoughton-Jackson, Courtney January 1997 (has links)
Fire has been an important influence on the structure and health of the North American grasslands for hundreds of years. In Jersey County Illinois, two natural loess hill prairies were studied to compare the effectiveness of varying management regimes. The purpose was to determine how a burn vs. a nonburn management regime enhances or hinders the establishment of the prairie grasses and forbs in a tallgrass hill prairie ecosystem. The variables studied included: the vegetational abundance, the frequency, and the biomass of the species that were present. In addition the soil's organic matter content and pH were measured. Overall, the Fire Road Prairie, or the unburned prairie, proved to be the community that was deteriorating and becoming unproductive. Whereas, the Osage Prairie contained a balance of grasses and forbs that were representative of a healthy and thriving community. The data supported the existing theory that a burn management plan does help the overall stability and productivity of a tallgrass ecosystem. / Department of Natural Resources and Environmental Management
28

The effects of prescribed fire on herbaceous plant community composition and tree seedling density in a mature oak forest : Hoosier National Forest, Pleasant Run Unit, Jackson County, Indiana

Ring, Jenifer L. January 1998 (has links)
A stratified sampling method was used to study the effects of two prescribed fires on a 250-acre section at the northwest end of Fork Ridge, Hoosier National Forest, in the spring of 1993 and 1995. An unburned area at the southeast end of Fork Ridge, adjacent to the burned area, and with similar forest communities, was used as a control area. Three growing seasons after the last fire, the burned area exhibited noticeable differences in understory vegetation. Herbaceous species diversity and richness, total herb cover on mesic sites, and mean percent cover and relative frequency for mesic-site, shade-tolerant species were greater on the burned area than on the unburned area. Dry-site, shade-intolerant tree seedlings including scarlet oak (Quercus Coccina), chestnut oak (Quercus prinus), sassafras (Sassafras albi dum), and tulip poplar (Liriodendron tulipifera) had higher relative frequency in the burned area, while shade-tolerant flowering dogwood (Cornus Florida) had lower relative frequency. / Department of Biology
29

Effect of Slope and Aspect on Litter Layer Moisture Content of Lodgepole Pine Stands in the Eastern Slopes of the Rocky Mountains of Alberta

Gibos, Kelsy Ellen 06 April 2010 (has links)
For two fire seasons in Nordegg, Alberta, a system of in-stand weather stations were arranged along a north and south aligned valley and combined with collection of destructive fine fuel moisture content data in order to quantify variations due to differences in slope and aspect. South-facing sites were found to be slightly warmer (1.5°C), less humid (5%) and received on average 20% more solar radiation than the north-facing sites during the peak burning period of the day. Based on these weather observations a difference of 1 or 2 % moisture content between north and south sites was predicted using existing theoretical relationships. A corresponding difference in observed moisture content was not identified, due to the low transmittance recorded at the in-stand sites (<10% of open solar radiation measurements), variation amongst destructive samples and logistical limits on the number of replicates collected.
30

Effect of Slope and Aspect on Litter Layer Moisture Content of Lodgepole Pine Stands in the Eastern Slopes of the Rocky Mountains of Alberta

Gibos, Kelsy Ellen 06 April 2010 (has links)
For two fire seasons in Nordegg, Alberta, a system of in-stand weather stations were arranged along a north and south aligned valley and combined with collection of destructive fine fuel moisture content data in order to quantify variations due to differences in slope and aspect. South-facing sites were found to be slightly warmer (1.5°C), less humid (5%) and received on average 20% more solar radiation than the north-facing sites during the peak burning period of the day. Based on these weather observations a difference of 1 or 2 % moisture content between north and south sites was predicted using existing theoretical relationships. A corresponding difference in observed moisture content was not identified, due to the low transmittance recorded at the in-stand sites (<10% of open solar radiation measurements), variation amongst destructive samples and logistical limits on the number of replicates collected.

Page generated in 0.075 seconds