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  2. Tundra - Wikipedia

    en.wikipedia.org/wiki/Tundra

    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]

  3. Tundra of North America - Wikipedia

    en.wikipedia.org/wiki/Tundra_of_North_America

    The adversity of soil and climatic conditions proves to low production levels, as well as little biomass accumulation due to slow rates of nutrient release in cold and wet soils, specifically as a result of limited nitrogen and phosphorus (Nadelhoffer et al. 1996) Additionally, there are low temperatures and strong winds in the tundra causing most vegetation to be dominated by woody plants ...

  4. Biome - Wikipedia

    en.wikipedia.org/wiki/Biome

    A biome (/ ˈ b aɪ. oʊ m /) is a ... Tundra humus soils with solifluction (permafrost soils) Low, evergreen vegetation, without trees, growing over permanently ...

  5. Arctic tundra becoming a source of carbon dioxide emissions ...

    www.aol.com/news/arctic-tundra-becoming-source...

    When including the impact of increased wildfire activity, the Arctic tundra region has shifted from storing carbon in the soil to becoming a carbon dioxide source. / Credit: NOAA

  6. Arctic tundra transformed from a carbon sink into a source of ...

    www.aol.com/news/arctic-tundra-become-source...

    The tundra has become a source of emissions, rather than a carbon sink, the authors said. ... largely because of cold temperatures and frozen soils.” A carbon sink, by definition, absorbs and ...

  7. The Arctic tundra is changing so fast that it is speeding up ...

    www.aol.com/arctic-tundra-changing-fast-speeding...

    The Arctic tundra now releases more carbon than it naturally draws down from the sky, as wildfires burn down its trees and permafrost thaw releases potent gases from its soil.

  8. Alpine tundra - Wikipedia

    en.wikipedia.org/wiki/Alpine_tundra

    Alpine tundra is a type of natural region or biome that does not contain trees because it is at high elevation, with an associated harsh climate. As the latitude of a location approaches the poles, the threshold elevation for alpine tundra gets lower until it reaches sea level, and alpine tundra merges with polar tundra .

  9. Iceland boreal birch forests and alpine tundra - Wikipedia

    en.wikipedia.org/wiki/Iceland_boreal_birch...

    Because the island is young and isolated from larger land masses, species biodiversity is relatively low. Forest cover has been reduced to about 1% of the original birch forest by a long history of timber extraction and soil erosion caused by sheep grazing. Blanket bogs (areas of high rainfall and peat accumulation) are common. [1] [2] [3] [4]