Gross Primary Productivity vs. Net Primary Productivity
Outgoing & Incoming energy
What is Gross Primary Productivity?
GPP stands for gross primary productivity. Gross primary productivity or GPP is the net amount of energy that is produced by the main energy producers of the ecosystem in a particular area during the specific time. GPP tends to state the total productivity. In other words, GPP is said to the total amount of energy produced by the green plants. It mainly depends on the chlorophyll content of the plant. Another thing to be noted that GPP has no other factors that can decrease its rate due to which it is a continuous process or productivity. GPP is the rate of organic matter formed by the energy producers (plants) + the rate of respiration of energy producers (plants).
What is Net Primary Productivity?
NPP stands for net primary productivity. Net primary productivity or NPP is defined as the net amount of energy that is stored by the main energy producers of the ecosystem per unit area in unit time. NPP tends to state the total difference between GPP and the energy used by the producer for respiration. In other words, NPP is said to be the total amount of energy stored by the green plants. It doesn’t depend on the chlorophyll content of the plant. NPP is equal to the gross primary productivity – rate of respiration.