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26/12/2021 3:23 pm
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What is primary productivity? Give a brief description of factors that affect primary productivity.
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26/12/2021 3:25 pm
The rate of biomass production is called productivity. It is expressed in terms of g-2yr-1 or (Kcal-m-2) yr-1 to compare the productivity of ecosystems.
It can be divided into Gross Primary Productivity (GPP) and Net Primary Productivity (NFP).
Gross Primary Productivity of an ecosystem is the rate of production of organic matter during photosynthesis. A considerable amount of GPP is utilized by plants in respiration.
Gross primary productivity minus respiration losses (R), is the Net Primary Productivity (NPP). GPP – R = NPP.
Primary productivity depends on:
- The plant species inhabiting a particular area.
- The environmental factors.
- Availability of nutrients.
- Photosynthetic capacity of plants.