In an ecosystem the rate of production of organic matter during photosynthesis is termed as

Gross primary productivity (GPP) is the rate at which energy is captured and stored by autotrophs in an ecosystem through photosynthesis. This represents the total amount of organic matter produced by
autotrophs in an ecosystem during a given time period. 
(1) Secondary productivity refers to the rate at which biomass is produced by heterotrophs in an ecosystem through consumption of organic matter produced by autotrophs. 
(2) Net productivity is a broader term that can refer to the net production of organic matter by any trophic level in an ecosystem, not just autotrophs. It can refer to either net primary productivity or net secondary productivity.
(3) Net primary productivity refers specifically to the net production of organic matter by autotrophs after
accounting for respiration losses, not the rate of production during photosynthesis.