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This research focuses on contemporary and historical relationships between landscape change and human impacts in southwest Yukon, Canada, in order to bring to light the nature of cumulative social effects, and culturally appropriate methodologies that may be used for their evaluation. Results were acquired through twenty eight semi-structured interviews with natural resource managers, health and social workers, First Nations, and non-First Nations residents, in which resource development, and other important local markers of change were topics of discussion. Social thresholds are also developed from these results for their use in supporting resource management decisions. Resilience theory plays a center role in...
Tree characteristics were compared between successfully attacked, unsuccessfully attacked, and unattacked trees. Percent of the bole covered with constant crown, crown volume, recent radial growth, and age were significantly different between successfully attacked and unattacked trees. Successfully attacked trees produced less induced resinosis than unsuccessfully attacked trees. Fast- and slow-growing subalpine fir were pheromone baited to induce attack. Although all baited trees were attacked, slow-growing trees were more likely to be successfully attacked than fast-growing trees. Fast- and slow-growing subalpine fir were inoculated with a blue-stain fungus. Lesion length was significantly greater in fast-growing...
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Canadian Fire Weather Index (FWI) System components and head fire intensities were calculated for fires greater than 2 km2 in size for the boreal and taiga ecozones of Canada from 1959 to 1999. The highest noon-hour values were analysed that occurred during the first 21 days of each of 9333 fires. Depending on ecozone, the means of the FWI System parameters ranged from: fine fuel moisture code (FFMC), 90 to 92 (82 to 96 for individual fires); duff moisture code (DMC), 38 to 78 (10 to 140 for individual fires); drought code (DC), 210 to 372 (50 to 600 for individual fires); and fire weather index, 20 to 33 (5 to 60 for individual fires). Fine fuel moisture code decreased, DMC had a mid-season peak, and DC increased...
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The present study used overlapping burn scars from natural wildfires to examine the effects of changes in the fire-free interval on early successional plant communities in boreal forests of central Yukon Territory, Canada. Data on plant community composition and residual organic material were collected in the first decade of post-fire regeneration in two study areas with recent fire overlap. Sites with a shorter fire-free interval had reduced loads of deadwood and shallower organic layers after the most recent fire. Multivariate analysis of species cover indicated that sites in and out of the burn overlap zones also supported distinct plant communities. Differences in the plant communities were associated with a...
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Combining proxy methods in paleoecology studies has the potential to bring new insight into changes in vegetation over time. Keyhole Pond, a small lake in southwest Yukon Territory, is surrounded by small grasslands but located within the boreal forest. This lake was chosen to explore local grassland and forest changes over the Holocene, as well as the impact of fire on these communities. A 3-metre lake sediment core was retrieved from the deepest part of the lake using a modified Livingston piston-corer. The lake sediment core has a basal date of ∼11,000 before present (BP). Samples were extracted at 3-centimetre intervals (∼100 years between samples) and processed for both pollen and charcoal analysis. Only charcoal...
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Vegetation response and burn severity were examined following eight large wildfires that burned in 2003 and 2004: two wildfires in California chaparral, two each in dry and moist mixed-conifer forests in Montana, and two in boreal forests in interior Alaska. Our research objectives were: 1) to characterize one year post-fire vegetation recovery relative to initial fire effects on the soil surface that could potentially serve as indicators of vegetation response (and thus, ultimately longerterm post-fire ecosystem recovery), and 2) to use a remotely-sensed indicator of burn severity to describe landscape patterns in fire effects. We correlated one-year post-fire plant species richness and percent canopy cover to...


map background search result map search result map COMPILING, SYNTHESIZING AND ANALYZING EXISTING BOREAL FOREST FIRE HISTORY DATA IN ALASKA ; FINAL REPORT TO THE JOINT FIRE SCIENCE PROGRAM   Post-fire burn severity and vegetation response following eight large wildfires across the western United States [electronic resource] Indirect and Long-Term Effects of Fire on the Boreal Forest Carbon Budget Controls on Patterns of Biomass Burning in Alaskan Boreal Forests Influence of Fire on Long-Term Patterns of Forest Succession in Alaskan Boreal Forests Large fires as agents of ecological diversity in the North American boreal forest RELATIONSHIPS AMONG FIRES, FUNGI, AND SOIL DYNAMICS IN ALASKAN BOREAL FORESTS Quantifying fire severity, carbon, and nitrogen emissions in Alaska's boreal forest Multi-trophic resilience of boreal lake ecosystems to forest fires Perceptions of change in southwest Yukon land and socialscapes: Implications for the study of cumulative effects and social thresholds Stand-level Attributes of Snowshoe Hare (Lepus americanus) Habitat in a Post-Fire Trembling Aspen (Populus tremuloides) Chronosequence in Central Yukon Recovery of forest-floor vegetation after a wildfire in a Picea mariana forest Relationship between fire, climate oscillations, and drought in British Columbia, Canada, 1920–2000 Vegetative and fire history of the area surrounding Keyhold Pond, Yukon Territory Response of boreal plant communities to variations in previous fire-free interval Modeling spatially explicit fire impact on gross primary production in interior Alaska using satellite images coupled with eddy covariance Understanding the effects of wildfire severity on moose habitat characteristics and use in Interior, Alaska The Role of Large Fires in the Canadian Boreal Ecosystem Post-fire burn severity and vegetation response following eight large wildfires across the western United States [electronic resource] RELATIONSHIPS AMONG FIRES, FUNGI, AND SOIL DYNAMICS IN ALASKAN BOREAL FORESTS Understanding the effects of wildfire severity on moose habitat characteristics and use in Interior, Alaska Recovery of forest-floor vegetation after a wildfire in a Picea mariana forest Vegetative and fire history of the area surrounding Keyhold Pond, Yukon Territory Modeling spatially explicit fire impact on gross primary production in interior Alaska using satellite images coupled with eddy covariance Response of boreal plant communities to variations in previous fire-free interval Stand-level Attributes of Snowshoe Hare (Lepus americanus) Habitat in a Post-Fire Trembling Aspen (Populus tremuloides) Chronosequence in Central Yukon Perceptions of change in southwest Yukon land and socialscapes: Implications for the study of cumulative effects and social thresholds Multi-trophic resilience of boreal lake ecosystems to forest fires Controls on Patterns of Biomass Burning in Alaskan Boreal Forests Quantifying fire severity, carbon, and nitrogen emissions in Alaska's boreal forest Indirect and Long-Term Effects of Fire on the Boreal Forest Carbon Budget Influence of Fire on Long-Term Patterns of Forest Succession in Alaskan Boreal Forests COMPILING, SYNTHESIZING AND ANALYZING EXISTING BOREAL FOREST FIRE HISTORY DATA IN ALASKA ; FINAL REPORT TO THE JOINT FIRE SCIENCE PROGRAM   Relationship between fire, climate oscillations, and drought in British Columbia, Canada, 1920–2000 Large fires as agents of ecological diversity in the North American boreal forest The Role of Large Fires in the Canadian Boreal Ecosystem