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  • Write the relationship between productivity, gross primary productivity, net primary productivity and secondary productivity.      

Write the relationship between productivity, gross primary productivity, net primary productivity and secondary productivity.

 

 

 

 
 
 
 
 

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PRODUCTIVITY- The rate of biomass production. It is expressed in terms of g^{-2} yr^{-2}or (kcal\; m^{-2}) yr^{-1} to compare the productivity of different ecosystems. It can be divided into gross primary productivity (GPP) and net primary productivity (NPP).

GROSS PRIMARY PRODUCTIVITY of an ecosystem is the rate of production of organic matter during photosynthesis.

NET PRIMARY PRODUCTIVITY- A considerable amount of GPP is utilised by plants in respiration. Gross primary productivity minus respiration losses (R), is the net primary productivity (NPP).

                                 GPP – R = NPP

Net primary productivity is the available biomass for the consumption to heterotrophs (herbiviores and decomposers).

SECONDARY PRODUCTIVITY is defined as the rate of formation of new organic matter by consumers.

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Priyanka Kumari

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