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Fire is the dominant type of disturbance in boreal North America, but the past 30-plus years have seen a gradual increase in fire frequency and severity as a result of warmer and drier conditions. From the 1960s to the 1990s, the annual area burned increased from an average of 1.4 to 3.1 million hectares per year.
In North America, one or two species of fir, and one or two species of spruce, are dominant. Across Scandinavia and western Russia, the Scots pine is a common component of the taiga, while taiga of the Russian Far East and Mongolia is dominated by larch .
A boreal ecosystem is an ecosystem with a subarctic climate located in the Northern Hemisphere, approximately between 50° and 70°N latitude. These ecosystems are commonly known as taiga and are located in parts of North America, Europe, and Asia. [1] The ecosystems that lie immediately to the south of boreal zones are often called hemiboreal ...
The boreal forest or taiga of the North American continent stretches through a majority of Canada and most of central Alaska, extending spottily into the beginning of the Rocky Mountain range in Northern Montana and into New England and the Adirondack Mountains of New York.
Boreal forests occur in the more southern parts of the taiga ecoregion that spreads across the northern parts of the world.. Canada's boreal forest is a vast region comprising about one third of the circumpolar boreal forest that rings the Northern Hemisphere, mostly north of the 50th parallel. [1]
This ecoregion is a mountainous area of ridges up to 1200m between peaks up to 2500m, located on the southern, Pacific Ocean side of the Alaska Peninsula from Cook Inlet west through the Kodiak Archipelago to Unimak Island at the beginning of the Aleutian Islands chain, while the area around Cook Inlet at the head of the peninsula is the neighboring Cook Inlet taiga ecoregion.
The taiga forests are mainly white spruce (Picea glauca), alaskan birch (Betula neoalaskana), balsam poplar (Populus balsamifera), and quaking aspen (Populus tremuloides) in the warmer drier areas, and black spruce (Picea mariana), and american larch (Larix laricina) where it is marshier but the ecoregion also contains scrubby areas of dwarf birch (Betula nana) and riverbanks of willows ...
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