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Class notes

Unit 1.8 APES Notes

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  • APES (SCZ611)
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Complete set of unit 1.8 environmental science class notes. Discusses primary productivity.

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  • October 18, 2024
  • 2
  • 2024/2025
  • Class notes
  • Chelsea miller
  • All classes
  • Unknown
  • APES (SCZ611)
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evelyng
Primary Productivity
The rate at which solar energy is converted into organic compounds via photosynthesis
over a unit time
-How fast are the produces photosynthesizing?
-How much is being produced and how fast?


"Productivity"
Measure in units of energy per unit area per time

● e.g. kcal/m²/yr
Or.

Biomass added per unit area per unit time

● e.g. g/m²/yr
If time is involved, you are looking at a rate

Gross Primary Productivity- the total rate of photosynthesis in a given area

Net Primary Productivity

The rate of energy storage by photosynthesizers in a given area AFTER subtracting the
energy lost to respiration

Because…
-Not all of the GPP goes into making biomass
-Some productivity is used for life processes (respiration) and the energy is ultimately
lost as heat

NPP = GPP -R

GPP- total # of solar E captured & converted into glucose (cellular E)

NPP- # of cellular E available to be made into new biomass

R- cellular E that was used during respiration to keep organism alive & to reproduce


Factors That Affect Primary Productivity

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