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.
Results
Showing 1 to 18 of 18 for “"fire exclusion"”.
-
Changes in forest structure and composition associated with unique land use histories: Implications for restoration
… explain these changes, the active suppression of fire since the early 1900s has been the most widely studied and cited. However, widespread logging in western North American forests has often predated effective fire suppression and has affected a majority of semi-arid forests. The extent to which …
-
Changes in forest structure and composition associated with unique land use histories: Implications for restoration
… explain these changes, the active suppression of fire since the early 1900s has been the most widely studied and cited. However, widespread logging in western North American forests has often predated effective fire suppression and has affected a majority of semi-arid forests. The extent to which …
-
Free living nitrogen-fixation in ponderosa pine/Douglas-fir forests in western Montana
… ecosystems is required to minimize N losses to fire, harvesting, and other forms of land management. The influence of fire, fire exclusion and forest restoration treatments on non-symbiotic N-fixation in the forest ecosystem has been poorly studied. Over the past 100 years, fire has been greatly …
-
Free living nitrogen-fixation in ponderosa pine/Douglas-fir forests in western Montana
… ecosystems is required to minimize N losses to fire, harvesting, and other forms of land management. The influence of fire, fire exclusion and forest restoration treatments on non-symbiotic N-fixation in the forest ecosystem has been poorly studied. Over the past 100 years, fire has been greatly …
-
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 …
-
Long-term effects of fire on nitrogen cycling in a broad-leaf savanna, Kruger National Park, South Africa
Fire with herbivory, climate, and soil properties including nutrients are said to be important in regulating the structure and function of savanna ecosystems. Frequent fire is often held responsible for a decrease in nitrogen pools and availability and the maintenance of low fertility conditions. …
-
Effects of prescribed burning, mechanical and chemical treatments to curtail rhododendron dominance and reduce wildfire fuel loads
… Mountains. After more than a century of fire exclusion in the U.S., the distribution of R. maximum and its dominance of forest understories have increased. Rhododendron expansion has caused a decline in overstory regeneration and the potential for dangerous fuel conditions around suburban …
-
Influence of Woody Vegetation Composition and Structure on Fuels and Prescribed Fire in Mountain Longleaf Restoration
… widespread ecological state shift largely due to fire exclusion which has allowed mesophytes, i.e., shade-tolerant, often fire-sensitive species to encroach, reducing flammability and biodiversity through a process known as “mesophication.” Although prescribed fire is commonly used to reverse …
-
ASSESSMENT OF WHITEBARK PINE SEEDLING SURVIVAL FOR ROCKY MOUNTAIN PLANTINGS
… shade-tolerant competitors following decades of fire exclusion have severely reduced whitebark pine and threaten these high-elevation ecosystems. Land managers are attempting to reverse whitebark pine’s decline by increasing regeneration of rust-resistant trees while restoring successional …
-
ASSESSMENT OF WHITEBARK PINE SEEDLING SURVIVAL FOR ROCKY MOUNTAIN PLANTINGS
… shade-tolerant competitors following decades of fire exclusion have severely reduced whitebark pine and threaten these high-elevation ecosystems. Land managers are attempting to reverse whitebark pine’s decline by increasing regeneration of rust-resistant trees while restoring successional …
-
A CENTURY OF CHANGE IN FOREST STRUCTURE AND FIRE REGIME CONDITION CLASS IN A WESTERN MONTANA PONDEROSA PINE DOUGLAS-FIR FOREST
… A Century of Change in Forest Structure and Fire Regime Condition Class in a Western Montana Ponderosa Pine/Douglas-fir Forest - Restoring historical forest conditions is often a driving force behind forest management activities today. However, determining historical, pre-settlement …
-
A CENTURY OF CHANGE IN FOREST STRUCTURE AND FIRE REGIME CONDITION CLASS IN A WESTERN MONTANA PONDEROSA PINE DOUGLAS-FIR FOREST
… A Century of Change in Forest Structure and Fire Regime Condition Class in a Western Montana Ponderosa Pine/Douglas-fir Forest - Restoring historical forest conditions is often a driving force behind forest management activities today. However, determining historical, pre-settlement …
-
Identifying the effects of land use and policy on disturbance regimes in the Teanaway Community Forest, Washington
The historic fire regime of the forests of the Eastern Cascades, Washington, has been described as one of high-frequency, low-severity fires using fire scar analysis. Over the past few centuries, the historically open, park-like ponderosa pine-dominated stands have been significantly altered due to …
-
Soil Morphological, Physical, and Chemical Parameters Affecting Longleaf Pine (Pinus palustris) Site Quality and Ecosystem Restoration Potential in East Texas
… including higher quality soils, due to frequent fires which kept many competing species suppressed. Decline in longleaf pine coverage has been attributed to many factors, including both site conversion and fire exclusion. Much of the land that originally supported longleaf pine in the …
-
Soil microbial response to land management practices and wildfire in Appalachian ecosystems
… using biochar agricultural amendments, wildfires, prescribed fires, and partial harvesting. Amending soil with biochar (i.e. pyrolyzed biomaterial) is a practice intended to enhance soil water holding capacity, build soil organic C stocks, and improve nutrient retention. In addition to …
-
Wildfires for resilience in California’s Sierra Nevada: fine-scale assessment at regional scales with airborne lidar
… to a warming climate and increasingly severe wildfires, droughts, and bark beetle outbreaks. In dry forest types, a history of fire exclusion, removal of Indigenous burning, and extensive logging have drastically altered forest structures and compositions over the past century, making the impacts …
-
Relationships of piñon juniper woodland expansion and climate trends in the Walker Basin, Nevada
… to be historical land uses such as grazing and fire exclusion. However, infillingand establishment is occurring throughout its distribution and relatively little attentionhas been paid to woodland movement uphill. This study focuses on two mountain rangeswithin the Walker Lake Basin, so as to …
-
Forest structure in unharvested old-growth: understanding the influence of soils on variability of long-term tree dynamics and fire history
… North American forests adapted to frequent fires have been fundamentally altered and fragmented as a result of fire exclusion, the transportation infrastructure, development patterns, and other landscape level changes. In order to enhance the resiliency, diversity, and productivity of forest …