Primary productivity:-
It is the rate of synthesis of biomass by producers per unit time per unit area through, the process of photosynthesis.
Factors:-
It depends up on sunlight, temperature moisture, nutrients and photosynthesis efficiency of producers.
(1) Sunlight:-
In tropical regions maximum sunlight is available. It reduces towards the pole. Therefore more photosynthesis and high productivity occurs in tropics.
(2) Temperature:-
Temperate forest have lesser productivity as compared to tropical forest due to cold climate during winter. Alpine and arctic regions have very low productivity because of low temperature almost through out the year.
(3) Moisture:-
Good rain and humidity increase productivity of the ecosystem with the fall in availability of water the productivity decreases.
(4) Nutrients:-
A regular availability of nutrients is required for sustaining plant growth and hence the productivity of an ecosystem.Coral reefs and esturies are highly productive as the nutrient supply is rich.
5. Photosynthetic efficiency:-
Some plants are photosynthetically more efficient in trapping sunlight than others.
eg: Sugarcane.
