Question

Give the relation between gross primary productivity and net primary productivity

Answer 1

Gross primary product:-
1.it is the amount of organic matter synthesized by producers/unit time.
2. it depends upon chlorophyll content.
3. it refers to the total productivity including the energy utilized for respiration by the ptoducers.

Net primary product:-
1. it is the amount of organic matter stored by producers per unit time.
2. it depends on chlorophyll content .

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$.$