Question

difference between net and gross primary productivity

Answer 1

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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$.$