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Map of national forests and national grasslands of the United States. The United States has 154 protected areas known as national forests, covering 188,336,179 acres (762,169 km 2; 294,275 sq mi). [1] National forests are managed by the U.S. Forest Service, an agency of the U.S. Department of Agriculture. [2]
The forests are equally spread geographically between east and west. Because of the forest's great size, and because of differing climate and soils, North America is favored by a rich variety of these "evergreens". This forest supports four times as many tree species as Europe does.
A Quarter Century US Forest Disturbance History from Landsat – the NAFD-NEX Products. Eastern forests cover about 384 million acres (1,550,000 km 2) and are predominantly broadleaf (74%), with the exception of extensive coniferous forests and plantations in the southern coastal region. These are largely in private ownership (83%).
Age of the bedrock underlying North America, from red (oldest) to blue, green, yellow (newest). Seventy percent of North America is underlain by the Laurentia craton, [5] which is exposed as the Canadian Shield in much of central and eastern Canada around the Hudson Bay, and as far south as the U.S. states of Michigan, Wisconsin, and Minnesota.
The Darién Gap forests had extensive cedrela and mahogany cover until many of these trees were removed by loggers. [33] Darién National Park in Panama, the largest national park in Central America, covers roughly 5,790 km 2 (2,240 sq mi) of land, and was established in 1980. The property includes a stretch of the Pacific Coast and almost the ...
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.
[12] [13] [42] Below the spruce-fir forest, at around 1,200 meters (3,900 ft), forest composition shifts in favor of deciduous trees such as American beech, maple, birch, and oak. [13] American rhododendron is the dominant understory shrub throughout the deciduous layer but is only occasionally present in spruce-fir forests.
The North American inland temperate rainforest is a 7 million hectare disjunct temperate rainforest spreading over parts of British Columbia in Canada as well as Washington, Idaho and Montana on the US side. [1] Its patches are located on the windward slopes of the Rocky Mountains and the Columbia Mountains, extending roughly over 1000km from ...