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Tropical rainforest (PowerPoint)

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					Tropical rainforest
1. Latitudinal extent-
0 deg - 5 deg N and S
 of equator
Areas
             Temperature Chart

30
25
20
15
10
     5
     0
         J   F M
                 A M




                                                   (Deg C)
                       J   J   A   S   O   N   D
          Rainfall Chart

600

500

400

300

200

100

 0
      J F M A M J J A S O N D
2. Area- Amazon Basin in South
           America
Amazonian Rainforest
Congo Basin of Africa
Malaysia, Indonesia, Philippines in Asia
Rainforest in Borneo
        3. Climate
• Temperature- very high,
  with average temperature
  between 25 deg to 30 deg
  C
• Rainfall-
i. Very heavy, convectional rainfall
    due to high temperature
ii. Around 2000mm annually
iii.Accompanied by thunderstorms
• Clouds-
i. Remains cloudy all throughout the
    year
ii. Forms Cumulonimbus clouds

• Humidity- Very high
Rainforest is a store for vast amounts
                of water
Natural Vegetation(flora)
          Vegetation Structure


Emergent Layer

Canopy Layer

 Under Canopy
    Shrub Layer
             and
    Under storey
    Characteristics of vegetation
• Tropical rainforest is known as Selva
• Rainforest is the most luxuriant vegetation
  system in the world
• Over one third of the world’s tree grows here
• Trees are mostly evergreen but few are
  deciduous
       Layers of vegetation
i.Top Layer-
• Emergent layer
• Ht of trees- 30 – 50 m
• Grow very tall to trap maximum
  sunlight
ii. Second layer:
• Canopy, thickest layer
• Ht of trees between 25- 30 m
• Sunlight rarely penetrates the
   canopy
iii. Third Layer:
• Under Canopy
• Ht of trees between 15- 20 m
• This layers receives little sunlight
• Trees in this layer have broad leaves to trap
   maximum sunlight(modification and
   adaptation of plants)
iv. Fourth layer:
• Shrub layer
• Ht around 5 m high
• Very little sunlight reaches this layer
• Not very dense because of a lack of
  sunlight
v. Fifth layer:
• Undergrowth
• Not very thick because of a total
  lack of sunlight
Rainforest Canopy
Adaptation by plants- lianas(creepers)
Epiphytes(aerial roots, perched on
     high branches of trees)
Modification of plants in
 the tropical rainforest
Buttress roots- large roots to give
 maximum support to tall trees
Roots grow close to ground- to draw
maximum nutrients from the ground
Leaves have ‘drip tips’
Leaves have thick wax coat
Leaves at ground level
 are broad in order to
 trap maximum
 sunlight
Relationship between vegetation
          and climate
            Animal life(fauna)
• Insectivorous birds, bats, Asian falconets(fast
  flying), parakeet
• Squirrels, monkeys, tree frogs, tree lizard
• Tse tse flies, mosquitoes, spiders, butterflies
• Ground animals- jaguars and snakes
• Swamp and river animals- hippopotamuses,
  crocodiles, alligators
Blue eyed lizard
Chimpanzee
Tree frog
Anaconda
                 Population
• Thinly populated
• The following are the rainforest tribes:
Pygmies of Africa
Semangs of Malaysia,
Rainforest tribes of Amazon
Pygmies of Africa
Amazonian rainforest tribe
           Economic activity
Mainly agriculture:
 Rubber plantation of Malaysia
 Cocoa plantation of Ghana
 Other plantation crops are:
Coconut, banana, coffee
Rubber plantation of Malaysia
Collection of sap from rubber plant
Cocoa plantation in Ghana

				
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posted:2/22/2012
language:Latin
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