Skip to main content
Advanced Search

Filters: Tags: Monitoring 1-Changes in Plant and Animal Distribution: Ecosystems (X) > Types: Map Service (X) > Types: Shapefile (X) > Extensions: Citation (X)

282 results (46ms)   

View Results as: JSON ATOM CSV
thumbnail
The Spatial Alaskan Forest Ecosystem Dynamics (SAFED) model was validated across four of the most common vegetation types found in interior Alaska. The vegetation types were an aldef (Alnus spp.) - balsam poplar (Populus balsamifera L.) site (FP2), an old-growth balsam poplar and white spruce (Picea glauca (Moench) Voss) site (FP3), a mixed deciduous (primarily birch (Betula papyrifera Marsh.) and aspen (Populus tremuloides Michx.)) and white spruce site (UP2), and a mature white spruce site (UP3). The FP site types are common on the floodplain along the Tanana River and the UP site types are common in the uplands in interior Alaska. SAFED is based on nitrogen productivity for vegetation growth, litter fall quantity...
thumbnail
The likely direction of change in soil organic carbon (SOC) in the boreal forest biome, which harbors roughly 22% of the global soil carbon pool, is of marked concern because climate warming is projected to be greatest in high latitudes and temperature is the cardinal determinant of soil C mineralization. Moreover, the majority of boreal forest SOC is harbored in surficial organic horizons which are the most susceptible to consumption in wildfire. This research focuses on mechanisms of soil C accumulation in recently burned (2004) and unburned (61850-1950) black spruce (Picea mariana [Mill.] BSP) forests along gradients in stand productivity and soil temperature. The primary research questions in these three chapters...
thumbnail
"Wildlife Trees play a significant role in maintaining species richness in forested ecosystems by providing critical habitat. This study was completed to develop a better understanding of the relationship between ecosystem and tree attributes and an established functional Wildlife Tree type classification. Data from four studies conducted in different ecosystems in central British Columbia are compared in this paper. The four study areas were: (1) boreal aspen forests, (2) mixed conifer forests in the boreal foothills, (3) mixed conifer forests in the moist interior plateau, and (4) mixed conifer forests in the interior wet belt. In each study area, tree species were evaluated by diameter classes for the percentage...
thumbnail
The transition from forest to tundra, commonly called treeline, is expected to advance, particularly in northern latitudes. Treeline in two subarctic locales: the western Mackenzie Mountains, Northwest Territories, and the western Hudson Bay Lowlands southeast of Churchill, Manitoba were studied, with the objectives of determining: (i) the historical and current characteristics of the trees at altitudinal and latitudinal treelines, and; (ii) what factors contributed most to the configuration of treeline at its altitudinal and latitudinal limits. Five investigations were undertaken, each employing different methods in order to assess several variables, theorized to be key drivers of pattern and process at treeline....
thumbnail
SUMMARY Despite some confusion over the objectives and methods of ecosystem management (Yaffee 1999), there is increasing interest on the part of resource managers, scientists, and the public in moving toward ecosystem management of forest resources (Calhoun 1998). The Society of American Foresters (SAF) defined ecosystem management as an ecological approach to forest resources management that “attempts to maintain the complex processes, pathways and interdependencies of forest ecosystems and keep them functioning well over long periods of time, in order to provide resilience to short-term stress and adaptation to long-term change. Thus, the condition of the forest landscape is the dominant focus, and the sustained...
thumbnail
Lodgepole pine (Pinus contorta var. latifolia) stands were sampled in central Yukon, Canada (61.5?64°N latitude), which represented the northernmost 9% of the tree's North American range. Within this area, lodgepole pine occupied only ? 2% of the landscape. This study determined: 1) what forest sociations occurred (i.e. structural dominance-types); 2) how plant growth form composition and richness differed from the central portion of the species? geographical range; and 3) if stands were biased towards occurring on more thermally favorable south-facing slopes. Five lodgepole pine sociations were recognized among 100 relevés: Rhododendron groenlandicum (Labrador tea); Cladonia arbuscula (green reindeer lichen); Calamagrostis...
thumbnail
The National Wildlife Refuge System (NWRS) is committed to conserving fish, wildlife, and plants for current and future generations of Americans. Given a rapidly changing climate, managers may employ various adaptation strategies to meet legislated mandates. I explore how ecological context, policy, perceptions and available ecological knowledge inform adaptation strategies. In Chapter 2, I develop an ecosystem vulnerability framework to better understand how climate change risk and ecosystem resilience interact to impact the NWRS. With GIS, I rank refuges based on historic temperature change, historic precipitation change, and sea-level rise risk. To index resilience, I rank refuges based on refuge size, landscape...
thumbnail
The spatial patterns of trees and shrubs within the forest-tundra ecotones in the Mealy Mountains, Newfoundland and Labrador, and in the Ruby Ranges, Yukon Territory were characterized using spatial pattern analysis. The processes influencing the recruitment of juvenile trees into the adult population and how they may facilitate or hinder infilling and advance at Canada's treeline were inferred. In Labrador, trees were generally aggregated; recruitment into the adult population could be regulated by facilitation. Conversely, in the Yukon, trees were generally regularly distributed, possibly influenced by competition. At both sites, trees were generally independent of shrub cover. The spatial arrangement of trees...
map background search result map search result map Ecosystem and tree attributes affecting the presence of functional wildlife tree types Spatial patterns of trees and shrubs within the Canadian forest-tundra ecotone Northernmost North American Pinus contorta var. latifolia (lodgepole pine) sociations and vegetation diversity relative to its central range east of the Rocky Mountains Managing the National Wildlife Refuge System with climate change: The interaction of policy, perceptions, and ecological knowledge Measuring forest structure along productivity gradients in the Canadian boreal with small-footprint Lidar The role of Equisetum in nutrient cycling in an Alaskan shrub wetland The effects of fertilization and herbivory on the herbaceous vegetation of the boreal forest in north-western Canada: a 10-year study Relationship between fire, climate oscillations, and drought in British Columbia, Canada, 1920–2000 Floodplain Forests Along the Tanana River: Interior Alaska Terrestrial Ecosystem Dynamics and Management Considerations Protostelids from boreal forest and tundra ecosystems in Alaska Biomass allometry for alder, dwarf birch, and willow in boreal forest and tundra ecosystems of far northeastern Siberia and north-central Alaska Experimental design and practical problems of implementation Dendrochronology and treeline dynamics within arctic and alpine localities in western and central Canada Algal community response to experimental and interannual variation in hydrology in an Alaskan boreal fen Mechanisms of soil carbon stabilization in black spruce forests of interior Alaska: Soil temperature, soil water, and wildfire Ecosystem Dynamics of the Boreal Forest: the Kluane Project Boreal forest ecosystem dynamics. II. Application of the model to four vegetation types in interior Alaska Site preparation for establishing lodgepole pine on backlog sites in the sub-boreal spruce zone Why Do the Boreal Forest Ecosystems of Northwestern Europe Differ from Those of Western North America? The Rosa-Keystone Dunes Field: The geoarchaeology and paleoecology of a late Quaternary stabilized dune field in Eastern Beringia The effects of fertilization and herbivory on the herbaceous vegetation of the boreal forest in north-western Canada: a 10-year study The role of Equisetum in nutrient cycling in an Alaskan shrub wetland Why Do the Boreal Forest Ecosystems of Northwestern Europe Differ from Those of Western North America? Spatial patterns of trees and shrubs within the Canadian forest-tundra ecotone Biomass allometry for alder, dwarf birch, and willow in boreal forest and tundra ecosystems of far northeastern Siberia and north-central Alaska Experimental design and practical problems of implementation Protostelids from boreal forest and tundra ecosystems in Alaska Dendrochronology and treeline dynamics within arctic and alpine localities in western and central Canada The Rosa-Keystone Dunes Field: The geoarchaeology and paleoecology of a late Quaternary stabilized dune field in Eastern Beringia Floodplain Forests Along the Tanana River: Interior Alaska Terrestrial Ecosystem Dynamics and Management Considerations Algal community response to experimental and interannual variation in hydrology in an Alaskan boreal fen Ecosystem Dynamics of the Boreal Forest: the Kluane Project Boreal forest ecosystem dynamics. II. Application of the model to four vegetation types in interior Alaska Managing the National Wildlife Refuge System with climate change: The interaction of policy, perceptions, and ecological knowledge Mechanisms of soil carbon stabilization in black spruce forests of interior Alaska: Soil temperature, soil water, and wildfire Site preparation for establishing lodgepole pine on backlog sites in the sub-boreal spruce zone Northernmost North American Pinus contorta var. latifolia (lodgepole pine) sociations and vegetation diversity relative to its central range east of the Rocky Mountains Ecosystem and tree attributes affecting the presence of functional wildlife tree types Relationship between fire, climate oscillations, and drought in British Columbia, Canada, 1920–2000 Measuring forest structure along productivity gradients in the Canadian boreal with small-footprint Lidar