The Characteristics of the Rainforest

••• gustavofrazao/iStock/GettyImages

The Amazon Rainforest creates 20 percent of the Earth's oxygen because of its abundant tree and plant life. While the world's tropical rainforests vary -- from Africa, Southeast Asia, and South and Central America -- they all share key attributes: high precipitation levels and temperatures, poor soil quality and a startling array of biodiversity. Human intervention like forestry, agriculture and mineral extraction continues to harm these valuable ecosystems to this day.

TL;DR (Too Long; Didn't Read)

The Earth is home to three main rainforests found in Africa, Central and South America, and Southeast Asia. These rainforests share similar characteristics: lots of rain, high humidity and temperatures, poor soil quality and abundant biodiversity.

Not Surprisingly, Rainforests Are Wet

While the exact amount of rainfall rainforests see varies from year to year and location to location, they all receive copious amounts of rain. South America's rainforests can see from 6 1/2 to 10 feet of rainfall in a single year. That said, deforestation for use as farmland can decrease annual precipitation amounts. In the African rainforests, cutting down rainforest trees can reduce rainfall their peers see by 50 percent. Tropical rainforests are also incredibly humid: 88 percent humid in wet seasons, and 77 percent in dry seasons.

Rainforests Are Warm

Earth's three tropical rainforest systems sit between two latitudes called the Tropic of Cancer located at 23°27’N and the Tropic of Capricorn a 23°27’S, hence the term tropic. As these regions either sit near to or, in some cases directly on the equator -- the central latitude of the Earth that sees the most sunshine year-round -- they tend to be quite warm. The average temperature of a tropical rainforest is 85 degrees Fahrenheit. While, on occasion, temperatures can get much higher, temperatures change very little, 9 degrees, between seasons due to the equator's constant proximity to the sun. High humidity levels makes tropical rainforests feel even hotter.

Surprisingly, Rainforests Have Bad Soil

Rainforests have thick canopies of leaves and provide homes for a staggering variety of species, more than 45,000 in the Amazon alone. Under normal circumstances, this would mean more nutrients in the soil, as members of the ecosystem's biologically-rich makeup die and decompose in the dirt. But the heavy rainfall in these areas washes these nutrients away. Similarly, the hot and moist conditions decompose dead animal and plant matter quickly, causing existing plants to use up the nutrients faster than they would otherwise.

Rainforests Home Half the World's Species

Despite making up only 6 percent of the world's landmass, rainforests contain 50 percent of Earth's land-based species, biologists estimate. To put things in perspective, the rainforests of Borneo house around 2,500 distinct orchid species. The heavy rainfall and easy access to nutrients provide the setting for many thousands of plant species, which, in turn, feed animals, which feed other animals in a never-ending cycle. While each tropical rainforest shares common attributes, many species can be found only in one area, like the sharp-toothed meat-eating piranha fish native to rivers in the Amazon rainforest.

Related Articles

List of Tropical Rainforest Plants
Abiotic Factors of a Rain Forest
Natural Disasters in the Rainforests
Animals Found in the Tropical Evergreen Forest
How Plants and Animals Interact in the Rain Forest
The Characteristics of a Humid, Tropical Climate
What Are the Causes of the Destruction of Ecosystem?
Disadvantages of Cutting Down the Rain Forest
Facts for Kids: Rainforest Animals
What Is the Average Rainfall in a Rainforest?
The Trophic Levels in Rain Forests
Plants & Animals Found in Tropical Regions
The Effects of Human Intervention on the Environment
Herbivores of the Taiga
The Greenhouse Effect & Photosynthesis
The Effects of Cutting Down Trees on the Ecosystem
The Impact of Sunlight on the Tropical Savanna
Does the Tundra Have Rain?
Climate in Temperate Grasslands
What Is the Average Yearly Rainfall in the Sahara Desert?