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Concept of productivity
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7/25/2017 1
CONCEPT OF PRODUCTIVITY
2. PRODUCTIVITY
rate of biomass production
• biomass-the mass of living organisms within a particular
environment
has 2 kinds (primary and secondary)
3. 2 Kinds of Productivity
Primary
Productivity
Secondary
Productivity
4. 2 Kinds of Productivity
1. Primary Productivity
☺ Green plants fix solar energy and accumulate it in
organic forms as chemical energy
☺Photosynthesis
☺Chemosynthesis
6. 2 Aspects of Primary productivity
Gross Primary
Productivity
Net Primary
Productivity
7. 2 Aspects of Primary productivity
• The rate of production of biomass/ organic matter by producers
during photosynthesis
• Total gain in energy or biomass per unit time
Gross Primary Productivity
(GPP)
Respiration
• opposite of photosynthesis
• absorb free molecules of oxygen to create water, carbon dioxide,
and energy which helps the plant grow
8.
9.
10. • Refers to the biomass/organic matter available for the
consumption to heterotrophs, left after some respiration
loses
• The amount of energy-bound organic matter created per
unit area and time that is left after respiration
• NPP = GPP – respiration
2 Aspects of Primary productivity
Net Primary Productivity
(NPP)
11.
12. 2 Kinds of Productivity
☻The rates at which the heterotrophic organisms
resynthesize the energy-yielding substances
☻transfer of organic material between trophic
levels
2. Secondary
Productivity
14. Summary
1. gross productivity – total biomass produced
2. net productivity – total biomass produced minus amount used by
organism
3. primary productivity – productivity at 1st trophic level
4. secondary productivity – productivity at higher trophic level
5. gross primary productivity – rate at which producers use
photosynthesis to make more biomass
6. net primary productivity – rate at which energy for use by consumers is
stored in new biomass
