Gross Primary Productivity

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The Gross Primary Productivity (GPP) of an ecosystem is the rate at which it accumulates biomass, including the energy it uses for the process of respiration. Thus it measures the total consumption of energy of the ecosystem.

The Gross Primary Productivity should not be confused with the Net Primary Productivity (NPP). The NPP refers to the rate at which an ecosystem accumulates biomass minus the energy used for the process of respiration.

Thus the GPP = NPP + respiration energy.

Both the Gross Primary Productivity and Net Primary Productivity are usually measured in kj/m²/year.

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