Rainforests research project

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Where:

The rainforests are highlighted on the map. They consist in Africa, Asia, Australia and South America; however in this report we will be focusing on the Brazilian rainforest. The Brazilian rainforest is located in the tropic of cancer.  

What:

The rainforest is not one ecosystem but millions of unique ecosystems. It is the central nervous system of our planet, a hot bed of evolution, life and diversity. Its home to over half of the worlds species and home to hundreds of humans.

As you can see from the diagram. The rainforest is arranged in layers. The tallest trees are called emergent they are over 45m tall. The canopy blocks out 80% of the rainfall and 95% of the sunlight. Trees of the under canopy are about 25m tall. Finally the shrub layer is basically the forest floor, it is very dark as very little light reaches it.  

The rainforest consists of two cycles; the water cycle and the nutrient cycle. Without these cycles the rainforest wont even exist.

Water cycle: It rains in the rainforest every night, due to daily heating of the forest; this causes transpiration out of the leaves and evaporation from surface water. This water rises as water vapour, before cooling, condensing and falling again as rain.

Nutrient cycle: Leaves and twigs fall from the trees. This forms litter on the soil. This decomposes with the aid of bacteria and form humus; humus contains nutrients. Nutrients are released from the humus and return to the soil. The trees absorb the nutrients from the soil dissolved in water, through their roots. The nutrient cycle starts all over by the falling leaves and twigs. The nutrient cycle is very rapid, most of the soil fertility is found in the top part of the soil.

You can find a lot of unique plants in the rainforest. All the plants found in the rainforest have adapted in a certain way for e.g. the drip tip has adapted to cope with high rainfall. Many plants in the rainforest have drip tip leaves. The drip tips enable raindrops to run of quickly. Another example is lianas; lianas are climbing woody vines that drape forest trees. They have adapted to the rainforest by having their roots in the ground and climbing high into the canopy to reach sunlight.  

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There are a lot of groups that see a value in the rainforest.

One interest group is the Indigenous people they take a local interest in the rainforest because they use they live in the rainforest. They have adapted a lifestyle, which does not destroy the ecosystem. Kayapo, Xingu and Yumonami are a few tribes that live in the rainforest. They practice the ‘slash and burn’ agriculture; that’s when they remove enough canopy to sustain then they move to another part. The area regenerates as natural rainforest; it takes up to 60 ...

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