What is primary productivity?
by 
Erin Albrecht
ANSWERS: 1
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The primary productivity of a community is the amount of biomass (biomass is defined as the total weight (total numbers X average weight) of all organisms in a given area or volume) produced through photosynthesis per unit area and time by plants, the primary producers. Primary productivity is usually expressed in units of energy (e.g., joules m -2 day -1) or in units of dry organic matter (e.g., kg m -2 year -1). Globally, primary production amounts to 243 billion metric tons of dry plant biomass per year. Productivity is effected by 1. light 2. nutrients and 3. hydrographic conditions
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