Boreal Plains

From Wikipedia, the free encyclopedia

The Boreal Plains is an ecozone in the western Canadian provinces of Manitoba, Saskatchewan and Alberta. It also has minor extensions into northwestern British Columbia and south-central Northwest Territories.

Industry in this ecozone once consisted primarily of forestry and agriculture, but in 1967 the Great Canadian Oil Sands Limited began extracting bitumen from the Athabasca Oil Sands. Operations there have expanded significantly since 2003, and the oil sands are becoming an increasingly significant economic factor in the region.

Wood Buffalo National Park, the largest national park in Canada, and Whooping Crane Summer Range, the only nesting and breeding area for the critically endangered Whooping Crane, are both located in the northern portion of this ecozone.

Contents

[edit] Geography

Overlaying a bedrock of Cretaceous shale and Tertiary sediments are thick deposits of soil that form a flat terrain in the Interior Plains.[1] It borders the Montane Cordillera to the west, closely following the border between Alberta and British Columbia. To its south is the Prairies ecozone for its entire extent, while to the north are the Taiga Plains, with its northeastern periphery adjacent to the Taiga Shield.

Covering 650,000 km², it is a region of subdued relief with few lakes. However, meltwater from glacial retreat between 11,000 and 8,000 years ago resulted in extensive deltas and dunes, forming Lake Winnipegosis at the eastern end of this zone.[2] It is a remnant of Lake Agassiz, a large glacial lake.[2] Most rivers originate in the Rocky Mountains, flowing eastward through the zone.[2]

Forestry has been an important industry because the region is nearly covered by timber, about 84% of the region.[3] Agriculture can employ up to 20% of the land area, though it is typically less than that.

[edit] Climate

Lying east of the Rocky Mountains, the region experiences low precipitation, averaging 450 mm annually,[2] with 300 mm in the west and 650 mm in the east. However, this is greater than the rate of evaporation by over 100 mm in the south, and 300 mm in the north and at the foothills of the Rockies. The excess moisture promotes the development of wetlands and peat bogs, which account for between 25-50% of the ecozone's area.[4]

Summers are moderately warm, with mean July temperatures of 13°C to 15°C, whereas winters may be very cold, with mean January temperatures of -17.5 in the north and -11°C in the south.[4]

[edit] Protected areas

Within this ecozone are a number of protected areas. These include:[5]

[edit] References

  1. ^ Bernhardt, Torsten. Boreal Plains. Canada's Ecozones, Canadian Biodiversity project. McGill University, Redpath Museum. Retrieved on 2008-02-03.
  2. ^ a b c d Landforms and Climate of the Boreal Plains Ecozone. Boreal Plains Ecozone. Environment Canada. Retrieved on 2008-02-03.
  3. ^ "Boreal Heartland". Boreal Plains Ecozone. Environment Canada. Retrieved on 2008-02-03.
  4. ^ a b Boreal Plains. Forest Ecozones of Canada. Natural Resources Canada. Retrieved on 2008-02-03.
  5. ^ Terrestrial Ecozones of Canada. Teacher Resource Centre. Parks Canada. Retrieved on 2008-02-13.