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[1] [2] Tropical rainforest climate zones (Af). Tropical forests: from the UN FRA2000 report. Tropical rainforests are dense and warm rainforests with high rainfall typically found between 10° north and south of the Equator. They are a subset of the tropical forest biome that occurs roughly within the 28° latitudes (in the torrid zone between ...
Oxisols are a soil order in USDA soil taxonomy, best known for their occurrence in tropical rain forest within 25 degrees north and south of the Equator. In the World Reference Base for Soil Resources (WRB), [1] they belong mainly to the ferralsols, but some are plinthosols or nitisols. Some oxisols have been previously classified as laterite ...
The biome includes several types of forests: Lowland equatorial evergreen rain forests, commonly known as tropical rainforests, are forests which receive high rainfall (tropical rainforest climate with more than 2000 mm, or 80 inches, annually) throughout the year. [5]
Most of the interior of the Amazon basin is covered by rainforest. [6] The dense tropical Amazon rainforest is the largest tropical rainforest in the world. [2] It covers between 5,500,000 and 6,200,000 square kilometres (2,100,000 and 2,400,000 sq mi) of the 6,700,000 to 6,900,000 square kilometres (2,600,000 to 2,700,000 sq mi) Amazon biome.
Despite the growth of vegetation in a tropical rainforest, soil quality is often quite poor. Rapid bacterial decay prevents the accumulation of humus . The concentration of iron and aluminium oxides by the laterization process gives the oxisols a bright red colour and sometimes produces mineral deposits such as bauxite .
Tropical Forest river. The soils in wet tropical forests are some of the most diverse of any region, and they are the cause for many biological adaptations. There is a combination of highly weathered and leached soils as well as less weathered alluvial soils, categorized as "oxisols" and "ultisols". [13]
Along the banks of permanent rivers and in the spray of waterfalls are evergreen thickets similar in character to tropical rainforest, relics of a wetter past. In dambos (grasslands found in most of the country) and other marshes, soil water is available throughout the dry season, but they may be rather acidic.
This ecoregion has a tropical rainforest climate (Köppen: Af).This climate is characterized as hot, humid, and having at least 60 mm of precipitation every month. [5] [6] The lowland rain forests on the west side of the Barisan Mountains are wetter (6,000 mm/year) than those on the east side (2,500+ mm/year).
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