Question

Explain gross primary production and net primary production in detail

Answer 1

Gross primary production (GPP) is the amount of chemical energy as biomass that primary producers create in a given length of time. (GPP is sometimes confused with Gross Primary productivity, which is the rate at which photosynthesis or chemosynthesis occurs.)

Net primary production (NPP) is the rate of carbon uptake by vegetation, which is the balance between photosynthesis, or gross primary production, and autotrophic respiration 

Answer 2

Gross primary productivity

• It is the amount of organic matter synthesized by producers per unit time per unit area.
• It is equal to rate increase in body weight of producers plus loss suffered through respiration and damages.
• It depends upon photosynthetic efficiency of producers, availability of solar energy as well as inorganic nutrients$.$

Net primary productivity

• It is the amount of organic matter stored by producers per unit time and per unit area.
• It is equal to organic matter synthesized by photosynthesis minus utilization in respiration and other losses.
• It depends upon gross primary productivity as well as amount of consumption of photosynthesis.
• NPP is equal to GPP-R, where R is energy used in respiration$.$