Answer:
In term of ecosystem dynamics, flow of
energy takes place from one trophic level to the next trophic level and occured
in unidirectional way. About 50% of solar energy incident over earth is present
in Photosynthetic Active Radiation (PAR) and only 2-10% of this PAR is utilized
by green plants to form chemical energy (Gross Primary Productivity) (GPP).Out
of 90% of gross primary productivity is lost maximum during respiration and other
vital activities. GPP utilized by plants in respiration minus respiration
losses is the net primary productivity and is available to the organism of next
trophic level (herbivore and decomposers) for consumption.
Gross primary productivity of an
ecosystem is the rate of production of organic matter during photosynthesis.
So nature tend to increase gross
primary productivity through supporting the large number of plant (producers)
in an ecosystem.
Net primary productivity
is the available biomass for the consumption to heterotrophs
(human and animals) man tries to
increase net primary productivity by cultivating food and other crops which the
depend on to fullfil their needs.
Formula to genrate NPP is
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