State the relationship between gross primary productivity (GPP) and net productivity (NPP) in plants?

NPP = GPP – plant respiration

Productivity of a plant is the rate at which energy is stored in plant in form of organic substances for photosynthesis

• Gross productivity (GPP) is the rate at which chemical energy derived from photosynthesis is stored by the plant.
• Net productivity (NPP) is the net gains of organic materials in photosynthesis allowing for the losses due to respiration.
• Thus, NPP = GPP – losses due to respiration

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