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Ecosystem Productivity

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Basic principle: energy is lost as it moves through an ecosystem ... What happens to solar energy striking a temperate deciduous forest? 15 % reflected ... – PowerPoint PPT presentation

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Title: Ecosystem Productivity


1
Ecosystem Productivity
2
Ye olde food pyramid, revisited
  • Updated name trophic dynamism
  • Basic principle energy is lost as it moves
    through an ecosystem
  • In The Beginning (at the base of the pyramid),
    solar energy is absorbed by photosynthetic
    organismsthe primary producers. After that, its
    all downhill.

3
Net Primary Productivity ( NPP)
  • The amount of energy available to consumers after
    primary producers have satisfied their own needs.
  • Gross Primary Production minus
  • Energy lost as heat
  • Energy used for growth
  • Energy used in respiration

4
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5
What happens to solar energy striking a temperate
deciduous forest?
  • 15 reflected
  • 41 converted to heatre-radiated
  • 42 absorbed during evapotranspiration
  • 2.2 fixed by plants as gross primary production
  • 1.2 used in plant respiration
  • 1 left as Net Primary Production (NPP)

6
Liebigs Law of the Minimum Rate of production
limited by the least available resource. Terrestr
ial ecosystems water Aquatic ecosystems
nutrients (generally N and P)
7
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8
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9
Q of the Day Would the number of trophic levels
in most marine habitats be lower than or greater
than in terrestrial habitats? Why?
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