In Ecological terms, primary productivity is mainly referred as the production of organic compounds through the biological process of photosynthesis.
It is also defined as the rate at which solar energy is converted into organic substances through the process of photosynthetic and chemosynthetic autotrophs.
The main source of energy used to synthesize the complex organic molecules in primary productivity is the solar energy. There are two aspects of primary productivity:
- Gross primary productivity – The total amount of energy produced in an ecosystem.
- Net primary productivity – The amount of energy used by the producer for respiration.
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