Concept of productivity

Productivity

1. CONCEPT OF PRODUCTIVITY

2. PRODUCTIVITY r ate of biomass production biomass-the mass of living organisms within a particular environment h as 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

5. 1. Primary Productivity

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 a bsorb free molecules of oxygen to create water, carbon dioxide, and energy which helps the plant grow

8. 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)

9. 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

10. 2. Secondary Productivity

11. Summary gross productivity – total biomass produced net productivity – total biomass produced minus amount used by organism primary productivit y – productivity at 1 st trophic level secondary productivity – productivity at higher trophic level gross primary productivity – rate at which producers use photosynthesis to make more biomass net primary productivity – rate at which energy for use by consumers is stored in new biomass

12. References http:// www.biologydiscussion.com /ecology/productivity-in-ecosystem/52928 http://ib.bioninja.com.au/standard-level/topic-4-ecology/42-energy-flow/ecological- productivity.html https:// en.wikipedia.org /wiki/Productivity_(ecology ) http:// www.mrgscience.com / ess -topic-23-flows-of-energy-and- matter.html