Make your own free website on Tripod.com

The Rainforest

Home | Introduction | Where are the worlds Rainforest? | What are Rainforests like? | Indigenous People | Tourism | Disappearing??? | Conclusion | Bibliography

What are Rainforests like?

There are four very distinct layers of trees in a tropical rain forest. These layers have been identified as the emergent, upper canopy, understory, and forest floor. But there is also a shurb layer, this is where not alot of light can get in so not much plants grow here and they dont grow tall either.

Here they are ...

Layers of the rainforest

Emergent trees are spaced wide apart, and are 100 to 240 feet tall with umbrella-shaped canopies that grow above the forest. Because emergent trees are exposed to drying winds, they tend to have small, pointed leaves. These giant trees have straight, smooth trunks with few branches. Their root system is very shallow, and to support their size they grow buttresses that can spread out to a distance of 30 feet.
 
The upper canopy of 60 to 130 foot trees allows light to be easily available at the top of this layer, but greatly reduced any light below it. Most of the rainforest's animals live in the upper canopy. There is so much food available at this level that some animals never go down to the forest floor. The leaves have "drip spouts" that allows rain to run off. This keeps them dry and prevents mold and mildew from forming in the humid environment.
 
The understory, or lower canopy, consists of 60 foot trees. This layer is made up of the trunks of canopy trees, shrubs, plants and small trees. There is little air movement. As a result the humidity is constantly high. This level is in constant shade.
 
SHRUB LAYER
This is the layer that grows between the smaller trees of the understory and the forest floor. This layer is mostly composed up of  ferns, small shrubs and wood. The shrub layer is lessThan ten feet in height and younger, smaller trees awaiting a gap in the canopy to grow to full stature.
 
The forest floor is usually completely shaded, except where a canopy tree has fallen and created an opening. Most areas of the forest floor receive so little light that few bushes or herbs can grow there. As a result, a person can easily walk through most parts of a tropical rain forest. Less than 1 % of the light that strikes the top of the forest penetrates to the forest floor. The top soil is very thin and of poor quality. A lot of litter falls to the ground where it is quickly broken down by decomposers like termites, earthworms and fungi. The heat and humidity further help to break down the litter. This organic matter is then just as quickly absorbed by the trees' shallow roots.
 

green_leaf_flies.gif