The leaves are much larger at this level and insect life is abundant. [13][14] They need to be able to withstand the hot temperatures and strong winds that occur above the canopy in some areas. The Tropical Rainforest : A World Survey of Our Most Valuable Endangered Habitat : With a Blueprint for Its Survival. Amanda Haidet May 2003", "Brazil sees traces of more isolated Amazon tribes", "BBC: First contact with isolated tribes? [20], A natural rainforest emits and absorbs vast quantities of carbon dioxide. Estimates vary from 40% to 75% of all biotic species are indigenous to the rainforests. On younger substrates, especially of volcanic origin, tropical soils may be quite fertile. months, according to official government data. With this addition, Brazil has now overtaken the island of New Guinea as the country having the largest number of uncontacted tribes. Tropical rainforests exist in Southeast Asia (from Myanmar (Burma)) to the Philippines, Malaysia, Indonesia, Papua New Guinea and Sri Lanka; also in Sub-Saharan Africa from the Cameroon to the Congo (Congo Rainforest), South America (e.g. The understory or understorey layer lies between the canopy and the forest floor. Mean monthly temperatures exceed 18 °C (64 °F) during all months of the year. A canopy stops much of the sunlight entering the jungle. When the soil is acidic, there is little difference, and therefore little absorption of nutrients from the soil. Ciao, anche io ho avuto parecchi problemi con questa parola. Rainforests are forests characterized by high and continuous rainfall, with annual rainfall in the case of tropical rainforests between 2.5 and 4.5 metres (98 and 177 in)[1] and definitions varying by region for temperate rainforests. [42] At present rates, tropical rainforests in Indonesia would be logged out in 10 years and Papua New Guinea in 13 to 16 years. Finally, these soils are poor due to the high volume of rain in tropical rainforests washes nutrients out of the soil more quickly than in other climates. ( Log Out / [30] At the same time, rainforests are usually not used sustainably by non-native peoples but are being exploited or removed for agricultural purposes. No rainforest today can be considered to be undisturbed. [46] Amazon deforestation jumped by 69% in 2008 compared to 2007's twelve Only about 5% of the sunlight shining on the rainforest canopy reaches the understory. Più che intenderlo come "volta" o "tetto", forse si può dare il significato di "fitto" inteso come una giungla tanto densa da non far passare la luce del sole... ...ricoperta dal duplice baldacchino della giungla... non sono madrelingua, perciò magari saprai una parola migliore. The densest areas of biodiversity are found in the forest canopy, a more or less continuous cover of foliage formed by adjacent treetops. ", Brazil: Amazon Forest Destruction Rate Has Tripled, "Papua New Guinea's rainforests disappearing faster than thought", "Science: Satellite monitors Madagascar's shrinking rainforest, 19 May 1990, New Scientist", China is black hole of Asia's deforestation, Amazon deforestation rises sharply in 2007, New Jungles Prompt a Debate on Rain Forests, Dave Kimble's Rainforest Photo Catalog (Wet Tropics, Australia), https://en.wikipedia.org/w/index.php?title=Rainforest&oldid=983979800, Wikipedia indefinitely semi-protected pages, Wikipedia indefinitely move-protected pages, Articles needing additional references from July 2017, All articles needing additional references, Articles needing additional references from February 2020, Articles lacking reliable references from November 2012, Creative Commons Attribution-ShareAlike License, This page was last edited on 17 October 2020, at 12:33.
Collectively, they are referred to as Dayaks or Orangulu which means "people of the interior". Tropical rainforests have been called the "jewels of the Earth" and the "world's largest pharmacy", because over one quarter of natural medicines have been discovered there.
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