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Tundra vegetation is composed of dwarf shrubs, sedges, grasses, mosses, and lichens. Scattered trees grow in some tundra regions. The ecotone (or ecological boundary region) between the tundra and the forest is known as the tree line or timberline. The tundra soil is rich in nitrogen and phosphorus. [2]
It is a monoecious, deciduous shrub growing up to 1–1.2 metres (3 ft 3 in – 3 ft 11 in) high. The bark is non-peeling and shiny red-copper colored. [3] The leaves are rounded, 6–20 millimetres (0.24–0.79 in) diameter, with a bluntly toothed margin. The leaves are a darker green on their upper surface.
Bearberries are three species of dwarf shrubs in the genus Arctostaphylos. Unlike the other species of Arctostaphylos (see manzanita), they are adapted to Arctic and subarctic climates, and have a circumpolar distribution in northern North America, Asia and Europe. Common bearberry from Thomé Flora von Deutschland, Österreich und der Schweiz 1885
These complex interactions between plants, animals and abiotic factors in the tundra are held together by the permafrost layer, located 450 metres (1,480 ft) under the soil. [3] However climate change is causing this crucial layer of frozen soil to melt. As a result, tundra communities are becoming unstable and basic processes are breaking down.
The term tundra comes through Russian тундра from the Kildin Sami word tūndâr "uplands," "treeless mountain tract." [15] There are three types of tundra: Arctic tundra, [16] alpine tundra, [16] and Antarctic tundra [17] In tundra, the vegetation is composed of dwarf shrubs, sedges and grasses, mosses, and lichens. Scattered trees grow ...
The ecoregion is a transition zone between the taiga forests to the south, and the treeless arctic tundra to the north. 50% of the territory is herbaceous cover, 18% moss and lichen, 6% shrubs, and about 1% tree cover in protected areas and along river courses. [3]
Bears, small mammals, birds, and insects also rely on the shrub as a food source. [2] American dwarf birch provides cover for ptarmigans, and grizzly bears use it consistently to construct their dens. [2] This species is valued for its erosion control potential, and has been used to help stabilize stream-banks. [2]
One of the smallest willows in the world, it is a prostrate, creeping dwarf shrub, only 2–9 cm (0.79–3.54 in) high, and has underground branches or runners in the uppermost soil layers. The leaves are rounded-ovate, 5–32 mm long and 8–18 mm broad, dark green with entire margins. It is dioecious, with
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