Tropical rainforest

Tropical rainforests are dense and warm rainforests with lots of rain. They are usually found between 10° north and south of the Equator. They are a type of tropical forest biome that occurs within the 28° latitudes (in the torrid zone between the Tropic of Cancer and Tropic of Capricorn). These forests have thick, tall trees and many different kinds of life.

Tropical rainforests have warm temperatures all year, above 18 °C (64 °F), and lots of rain each year. They are famous for their biodiversity. They are home to many species, including a large number of animals and plants. Their insect populations and variety of trees are also very notable.

Tropical rainforests have layers, each with its own plants and animals. These layers include the top layer with very tall trees, the middle canopy layer, the understory layer with lots of wildlife, and the forest floor, which has few plants because there is little light. Many indigenous peoples have lived in rainforests for a very long time, using them for food and homes.

Conservation efforts try to protect rainforests and use them in ways that do not harm them. Programs like Reducing Emissions from Deforestation and Forest Degradation (REDD and REDD+) work to stop deforestation and protect forests. However, rainforests still face threats from deforestation and climate change, making it important to balance protection with people’s needs.

Overview

Tropical rainforests are hot and wet places where it is always warm and rains a lot. The temperature stays above 18 °C all year, and these forests get at least 1,680 mm of rain each year—sometimes even more than 10 meters! Because of so much rain, the soil often does not have many nutrients.

These rainforests are full of life. They are home to half of all the world’s plants and animals. You can find many different kinds of insects, trees, and flowers in just one area. People call rainforests the “world’s largest pharmacy” because many medicines come from plants found there. Sadly, human activities are harming rainforests, making them shrink quickly.

Forest structure

Rainforests have different layers, each with plants and animals that live in special ways. The forest floor gets very little sunlight, so only plants that can grow in low light survive. Animals like okapis, tapirs, and gorillas walk here. The understory layer, just above the floor, has shade-tolerant plants and animals like leopards, poison dart frogs, and small mammals. Only a little sunlight reaches this layer.

The canopy is the main roof of the forest, full of tall trees and many different plants and animals, including birds, insects, and monkeys. The emergent layer has the tallest trees that rise above the canopy. These trees can grow very tall and host unique animals like large birds and bats. The structure of rainforests changes over time as trees fall and create gaps that help new plants grow.

Ecology

Tropical rainforests grow close to the equator. They have warm weather and lots of rain all year. These forests have special parts that help them stay strong. Many trees have big roots called buttress roots that spread out near the ground. These roots help trees get food and water fast.

Rainforests can change after big storms or when trees are cut down. When forests grow back, they are called secondary forests. These new forests slowly become like the old rainforest, with more plants and animals.

Biodiversity and speciation

Tropical rainforests are home to many different plants and animals. Scientists and ecologists want to know why the tropics have so much variety. One reason is that many species live close together and compete for food and space. Some species may go away, while others find new ways to survive by using different parts of the forest or eating different foods.

Another idea is the theory of Pleistocene refugia. This theory, proposed by Jürgen Haffer, suggests that during a cold period long ago, rainforests were split into smaller areas. These areas let species change separately. When the climate warmed up and rainforests grew back, the areas joined together again. Scientists still study this theory to learn more about how species in tropical rainforests became so diverse.

Human dimensions

Tropical rainforests have been home to many Indigenous people for thousands of years. Groups like the Indigenous peoples of the Americas, the Congo Pygmies, and tribes in Southeast Asia such as the Dayak people and the Penan people have lived in these areas. These communities often move with the seasons and trade valuable forest products like hides, feathers, and honey with people outside the forest.

Rainforests give us many important things, including foods and spices such as yam, coffee, chocolate, banana, mango, papaya, macadamia, avocado, and sugarcane. These plants originally came from tropical rainforests and are still mainly grown on plantations that were once forests. Rainforests also help keep our planet healthy by supporting wildlife, storing carbon, and influencing weather patterns.

Unfortunately, rainforests sometimes face damage from logging and farming, which can harm Indigenous communities and the environment. However, tourism, when done responsibly, can help protect these areas by providing money for conservation efforts and raising awareness about how important rainforests are.

Conservation

Rainforests face many threats that put their future at risk. One big problem is deforestation, where forests are cut down to make space for farming and other activities. Many valuable resources such as gold, silver, coltan, oil, and natural gas lie beneath these forests. While these resources can help economies grow, clearing forests often causes lasting damage.

Another challenge is climate change. Rainforests help absorb carbon dioxide from the air. When forests are destroyed, this important balance is lost, which can trap more heat in the atmosphere and raise global temperatures.

Efforts to protect rainforests include setting aside land for preservation and finding ways for local communities to use the forest sustainably. One global program, called Reducing Emissions from Deforestation and Forest Degradation (REDD), encourages companies and governments to support rainforest conservation. These actions help keep rainforests alive for future generations.

Main article: Climate change

See also: Effects of climate change on the tropics