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Types of Forests - PowerPoint PPT Presentation


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Types of Forests. Tropical (Rainforests). Canopy is often closed (little light reaches below) A canopy opening happens when a tree falls Plants competing for the light fill the space Many trees are covered with epiphytes Epiphyte - plants that grow on other plants instead of in the soil

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Presentation Transcript
tropical rainforests
Tropical (Rainforests)
  • Canopy is often closed (little light reaches below)
  • A canopy opening happens when a tree falls
    • Plants competing for the light fill the space
  • Many trees are covered with epiphytes
    • Epiphyte- plants that grow on other plants instead of in the soil
  • Rainfall determines the vegetation growth rate
coniferous forests
Coniferous Forests
  • Has cone bearing trees (pine, spruce, fir, and hemlock)
  • Also called temperate rain forests
  • Warm, moist air from the pacific ocean supports these unique communities
  • They are usually dominated by one or a few species of trees
  • The Taiga is the largest terrestrial biome on earth
  • Receives heavy snowfall but the cone shape of the trees prevents branches from breaking
  • Currently, they are being heavily logged.
taiga
The Northern Coniferous Forest stretches from North America to Eurasia.

The southern border of the artic tundra is called the TAIGA.

Taiga
temperate deciduous
Temperate Deciduous
  • Dense stands of trees
  • Occur where there is enough moisture to support growth of large trees
  • More open than rain forests, but not as tall
  • Has distinct vertical layers
  • Mammals in these forests hibernate and some migrate to warmer climates
    • Deciduous- plants that drop their leaves before winter
      • This is done because temperatures are too low for photosynthesis
deciduous trees and winter dormancy
Deciduous Trees and Winter Dormancy
  • Deciduous trees begin to lose their leaves when temperatures begin to get colder and the days become shorter
    • Circadian Rhythm- a 24 hour cycle that organisms internally live by
what causes leaves to fall
What causes leaves to fall?
  • This happens in 3 steps:
    • Cells die at the base of each leaf because of forming cork that cuts off the water and nutrients for the leaf
    • Green chlorophyll turns to other types of chlorophyll that can use sunlight better
      • Xanthophylls: yellow light
      • Carotenoids: yellow and orange light
      • Anthocyanins: scarlet and purple light
    • Leaves fall to the ground
      • This prevents trees from being damaged because of freezing temperatures and strong winds
      • The tree remains dormant in the winter until longer days and warmer weather cause new leaves to grow