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Primary Production
The amount of light energy converted to chemical energy by autotrophs during a given time period
What are the two measures of primary productivity?
Gross primary productivity (GPP) and net primary productivity (NPP)
Gross Primary Productivity (GPP)
The energy assimilated by autotrophs by photosynthesis
Net Primary Productivity (NPP)
The remaining organic matter after respiration by autotrophs
Standing crop
the total biomass of photosynthetic autotrophs at a given time