Sec 1 Exp - Tropical Rainforests

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Sec 1 Exp - Tropical Rainforests

  1. 1. Tropical Rainforests Workbook pg. 105 & 106
  2. 2. Where is tropical?
  3. 3. Rainforests are found in places with <ul><li>High temperatures </li></ul><ul><li>20 0 C to 30 0 C </li></ul><ul><li>High rainfall </li></ul><ul><li>1000 mm to 2000 mm </li></ul>
  4. 6. Layers of rainforests <ul><li>Have 3 layers </li></ul><ul><ul><li>Emergent </li></ul></ul><ul><ul><li>Canopy </li></ul></ul><ul><ul><li>undergrowth </li></ul></ul>
  5. 7. Emergent <ul><li>40m to 50m in height. </li></ul><ul><li>Buttress root to support the heavy and tall trunk. </li></ul><ul><li>Broad leaves to absorb as much sunlight as possible. </li></ul>
  6. 8. Emergent
  7. 10. What can you tell about the roots?
  8. 11. Buttress root
  9. 12. Buttress root
  10. 13. Buttress root
  11. 15. Canopy <ul><li>15m to 30m tall. </li></ul><ul><li>Top of the trees interlock to form a continuous layer. </li></ul><ul><li>Block out at least 70% of sunlight. </li></ul><ul><li>E.g. ferns, lianas and epiphytes </li></ul>
  12. 16. Canopy
  13. 17. Canopy
  14. 18. Undergrowth <ul><li>Consist of small trees, bushes, fern and herbs </li></ul><ul><li>Sparse </li></ul><ul><li>Receives very little sunlight. </li></ul>
  15. 19. Undergrowth
  16. 20. Undergrowth
  17. 21. Undergrowth
  18. 22. Layers of a tropical rainforests
  19. 23. Features of rainforests <ul><li>Trees grow very close to each other. </li></ul><ul><li>Broad leaves to absorb maximum sunlight. </li></ul><ul><li>Drip tip leaves </li></ul><ul><li>Evergreen due to heavy rainfall </li></ul><ul><li>Tall, straight and thin trunk to reach the top. </li></ul>
  20. 24. Drip tip / broad leaves
  21. 25. Evergreen
  22. 27. <ul><li>Can you identify what are hanging down from the branches? </li></ul>
  23. 31. <ul><li>Can you identify what is growing on the tree? </li></ul>
  24. 32. <ul><li>Epiphytes </li></ul><ul><ul><li>Bird nest fern </li></ul></ul>
  25. 33. Future of rainforests <ul><li>Deforestation / commercial logging </li></ul><ul><ul><li>Raw materials </li></ul></ul><ul><ul><li>Make way for buildings and agriculture. </li></ul></ul><ul><li>Extinction of animals and plants </li></ul>
  26. 34. Rainforests in Singapore
  27. 35. Bukit Timah Nature Reserve
  28. 36. Bukit Timah Rainforest
  29. 37. Sungei Buloh Wetland Reserve
  30. 38. Rainforests in Singapore <ul><li>Rainforests in Singapore were cleared due to </li></ul><ul><ul><li>Growing population </li></ul></ul><ul><ul><li>Industrial development </li></ul></ul>
  31. 39. Central Catchment Nature Reserve <ul><li>Bukit Timah Nature Reserve </li></ul><ul><li>Features </li></ul><ul><ul><li>164 hectares </li></ul></ul><ul><ul><li>Trees 30 m in height </li></ul></ul><ul><ul><li>Buttress root </li></ul></ul><ul><ul><li>Interlocking crowns </li></ul></ul><ul><ul><li>Forest floor dark and damp. </li></ul></ul>
  32. 40. Uses of rainforests in Singapore <ul><li>Water catchment areas </li></ul><ul><ul><li>MacRitchie </li></ul></ul><ul><ul><li>Seletar </li></ul></ul><ul><ul><li>Upper Pierce </li></ul></ul><ul><ul><li>Lower Pierce </li></ul></ul><ul><li>Natural heritage </li></ul><ul><li>Recreational activities </li></ul>

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