Question

Describe the interrelationship between productivity, gross primary productivity, and net productivity.

Answer 1

Hint: In any ecosystem, the productivity of primary producers is particularly important because, by photoautotrophs or chemoautotrophs, these species carry energy to other living organisms. The average rate of energy capture is Gross Productivity. Net efficiency in respiration / metabolism is lower, balanced for energy used by organisms.

Complete step by step answer:
Productivity reflects the cumulative total of primary gross productivity and primary net productivity. Productivity is the rate of production of biomass per unit area over a time span. Gross Primary Production is the rate at which organic matter is produced during photosynthesis. Plants use a large amount of GPP in respiration. Net Primary Productivity (NPP) is a major component of GPP and is used by respiratory plants. The residual biomass usable for heterotrophic consumption (herbivores and decomposers) constitutes the net primary productivity.
$NPP=GPP-R$
where R represents a loss of biomass due to respiration.

Additional information:
In the ecosystem, productivity is of two types, they are, primary and secondary. Green plants fix the solar energy and collect it as chemical energy in organic forms. As this is the first and basic type of energy storage, the rate at which the energy accumulates is known as primary productivity in the green plants or the producers.
The generation of the biomass of heterotrophic (consumer) species in a system is secondary production. This is motivated by the transition between trophic levels of organic material and reflects the amount of new tissue produced by the use of assimilated food.

Note: The highest gross primary productivity of the coral reef ecosystem is attributed to the availability of a large number of autotrophs per unit area. In terrestrial ecosystems, the maximum net primary productivity takes place in swamps , marshes, and tropical rainforests. In deserts, the lowest net productivity happens.