Business

Difference between Gross Primary Productivity and Net Primary Productivity

Main difference

Productivity represents the total increase in mass (phytomass). The productivity of an ecosystem is defined as the rate of production of the amount of (organic) matter formed or evolved per unit area over time. Gross primary productivity is defined as the rate at which the main producers of chemical energy ( plants) produce chemical energy, while ,Net primary productivity is defined as the total amount of chemical energy stored by the main producers of chemical energy (plants). The main difference between GPP and NPP is the production and storage of chemical energy. GPP is the production of useful chemical energy that is used to carry out the processes, while NPP is chemical energy that is not used but stored. So, we can say that NPP is the total energy stored or input from the main chemical producers, while GPP is the total energy expended or output from the main chemical producers. GPP can affect NPP while NPP cannot affect GPP.

Comparison chart

Gross primary productivity Net primary productivity
Gross primary productivity is the total amount of energy produced in the process. Net primary productivity is the total difference between GPP and the energy used by the producer for respiration.
Abbreviation
GPP stands for gross primary productivity. NPP stands for net primary productivity.
To affect
GPP has a direct effect on NPP. NPP has no effect on GPP.
Chlorophyll
GPP is totally dependent on the chlorophyll content of the plant. NPP does not depend on chlorophyll content.
Incoming and outgoing energy
GPP gives us the total outgoing energy in the system. NPP gives us the total input energy in the system.

What is gross primary productivity?

GPP stands for gross primary productivity. Gross primary productivity or GPP is the net amount of energy produced by the main energy producers of the ecosystem in a particular area during a specific time. GPP tends to indicate total productivity. In other words, GPP refers to the total amount of energy produced by green plants. It mainly depends on the chlorophyll content of the plant. Another thing to note is that GPP has no other factors that could lower its rate, so it is a continuous or productivity process. GPP is the rate of organic matter formed by the energy producers (plants) + the respiration rate of the 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 stored by the main energy producers of the ecosystem per unit area in unit time. NPP tends to indicate 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 green plants. It does not depend on the chlorophyll content of the plant. NPP is equal to gross primary productivity – respiration rate.

Key differences

  1. GPP stands for Gross Primary Productivity, while NPP stands for Net Primary Productivity.
  2. GPP is the total amount of energy produced in the process, while NPP is the total difference between GPP and the energy used by the producer for respiration.
  3. GPP has an effect on NPP, but NPP has no effect on GPP.
  4. GPP is the total production, while NPP is the total energy consumption.
  5. GPP is totally dependent on the chlorophyll content of the plant, but NPP is independent of chlorophyll.
  6. GPP gives us the total outgoing energy in the system, while NPP gives us the total incoming energy in the system.
  7. GPP is concerned with total productivity and contrary to this NPP is net productivity.

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