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The objective biomization method developed by Prentice et al. (1996) for Europe was extended using modern pollen samples from Beringia and then applied to fossil pollen data to reconstruct palaeovegetation patterns at 6000 and 18,000 14C yr bp. The predicted modern distribution of tundra, taiga and cool conifer forests in Alaska and north-western Canada generally corresponds well to actual vegetation patterns, although sites in regions characterized today by a mosaic of forest and tundra vegetation tend to be preferentially assigned to tundra. Siberian larch forests are delimited less well, probably due to the extreme under-representation of Larix in pollen spectra. The biome distribution across Beringia at 6000...
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Abstract. We compared the species composition and species density of vascular plants in the understorey vegetation of boreal forest between Picea mariana (Black spruce) and Populus tremuloides (Trembling aspen) stands in British Columbia, Canada, and related differences in species composition and species density between the two forest types to dominant canopy tree species as well as a wide variety of environmental factors. We analysed 231 stands, distributed in three different climatic regions representing drier, wetter, and milder variations of montane boreal climate. Of these stands 118 were dominated by P. mariana and 113 by P. tremuloides. P. tremuloides stands had higher species density than P. mariana stands...
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Several wetland classification schemes are now commonly used to describe wetlands in the contiguous United States to meet local, regional, and national regulatory requirements. However, these established systems have proven to be insufficient to meet the needs of land managers in Alaska. The wetlands of this northern region are predominantly peatlands, which are not adequately treated by the nationally-used systems, which have few, if any, peatland classes. A new system was therefore devised to classify wetlands in the rapidly urbanizing Cook Inlet Basin of southcentral Alaska, USA. The Cook Inlet Classification (CIC) is based on seven geomorphic and six hydrologic components that incorporate the environmental gradients...
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Northern peatlands provide important global and regional ecosystem services (carbon storage, water storage, and biodiversity). However, these ecosystems face increases in the severity, areal extent, and frequency of climate-mediated (e.g., wildfire, drought) and land-use change (e.g., drainage, flooding, and mining) disturbances that are placing the future security of these critical ecosystem services in doubt. Here we provide the first detailed synthesis of autogenic hydrological feedbacks that operate within northern peatlands to regulate their response to changes in seasonal water deficit and varying disturbances. We review, synthesize, and critique the current process-based understanding and qualitatively assess...
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Aim To infer a forest carbon density map at 0.01° resolution from a radar remote sensing product for the estimation of carbon stocks in Northern Hemisphere boreal and temperate forests. Location The study area extends from 30°?N to 80°?N, covering three forest biomes ? temperate broadleaf and mixed forests (TBMF), temperate conifer forests (TCF) and boreal forests (BFT) ? over three continents (North America, Europe and Asia). Methods This study is based on a recently available growing stock volume (GSV) product retrieved from synthetic aperture radar data. Forest biomass and spatially explicit uncertainty estimates were derived from the GSV using existing databases of wood density and allometric relationships between...
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1.?Ecosystem properties may be determined by the number of different species or groups of species in a community, the identity of those groups, and their relative abundance. The mass ratio theory predicts that the effect of species or groups of species on ecosystem properties will be dependent on their proportional abundance in a community. 2.?Single plant functional groups (graminoids, legumes, non-leguminous forbs) were removed from a natural grassland in northern Canada to examine the role of group identity in determining both ecosystem properties and biomass compensation by remaining species. Removals were conducted across two different environmental treatments (fertilization and fungicide) to examine the context...
Forested fans are common landforms in west central British Columbia. They can be subject to hydrogeomorphic processes ranging from debris flows to floods carrying bedload and woody debris. These processes represent hazards for forest management activities such as road construction and harvesting. Conversely, forest management activities can exacerbate the effect of natural hydrogeomorphic processes, increasing the level of disturbance on fan surfaces and in stream channels. This thesis presents the scientific basis for a hazard classification of fans for forest management. The classification is based on forest stand characteristics, airphoto and site features, and basic watershed attributes. Forest stands are used...
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Abstract: We assessed the degree to which Alaskan lands reflect the state's biodiversity by dividing the entire state into four categories of land protection ranging from highly protected to minimally protected in terms of potential for future development. We then compared the percentage of each ecoregion and plant-cover type in each land protection class. We assumed that 12% protection represents an acceptable minimum and examined the percentage of site records of rare plants in protected and unprotected areas. Of 28 ecoregions in Alaska, 15 (63.4%) have <12% of their area in highly protected areas. Similarly, 11 of 21 vegetation-cover types (43.7%) have <12% protection. For 32 rare vascular plants, an average...


map background search result map search result map Pollen-based biomes for Beringia 18,000, 6000 and 0 14C yr bp? Carbon stock and density of northern boreal and temperate forests Ecosystem properties determined by plant functional group identity Understorey vegetation in boreal Picea mariana and Populus tremuloides stands in British Columbia Terrain stability mapping on British Columbia forest lands: an historical perspective [electronic resource] A preliminary report on the vegetation zonation of palsas in the Arctic National Wildlife Refuge, northern Alaska, USA Incoming longwave radiation to melting snow; observations, sensitivity and estimation in northern environments Raptor monitoring in the upper Tanana Valley, Game Management Unit 12, Alaska, 2003 Regional ecology, ecosystem geography, and transboundary protected areas in the St. Elias Mountains North American vegetation model for land-use planning in a changing climate: a solution to large classification problems Ecoclimatic Zonation of Yukon (Canada) and Ecoclinal Variation in Vegetation Rethinking biogeoclimatic ecosystem classification for a changing world An ecological land survey for Fort Greely, Alaska Hydrological feedbacks in northern peatlands Evaluation of a wetland classification system devised for management in a region with a high cover of peatlands: an example from the Cook Inlet Basin, Alaska An ecological land survey for Fort Greely, Alaska Incoming longwave radiation to melting snow; observations, sensitivity and estimation in northern environments Raptor monitoring in the upper Tanana Valley, Game Management Unit 12, Alaska, 2003 Evaluation of a wetland classification system devised for management in a region with a high cover of peatlands: an example from the Cook Inlet Basin, Alaska Ecosystem properties determined by plant functional group identity A preliminary report on the vegetation zonation of palsas in the Arctic National Wildlife Refuge, northern Alaska, USA Regional ecology, ecosystem geography, and transboundary protected areas in the St. Elias Mountains Ecoclimatic Zonation of Yukon (Canada) and Ecoclinal Variation in Vegetation Terrain stability mapping on British Columbia forest lands: an historical perspective [electronic resource] Rethinking biogeoclimatic ecosystem classification for a changing world Understorey vegetation in boreal Picea mariana and Populus tremuloides stands in British Columbia Pollen-based biomes for Beringia 18,000, 6000 and 0 14C yr bp? Carbon stock and density of northern boreal and temperate forests North American vegetation model for land-use planning in a changing climate: a solution to large classification problems Hydrological feedbacks in northern peatlands