GPP means Gross primary production, which is the rate at which producers in an ecosystem absorb an amount of chemical energy as biomass in a given period of time. Biomass is the mass of living organisms in an area, and it is usually represented energy units. Biomass is a source of energy that is renewable, which can be used for chemical, biochemical, and thermal conversion for energy. NPP, which stands for Net primary production, is defined as the measure of the growth of a producer, which is obtained by the amount of carbon that is absorbed and then stored up by vegetation.
To determine NPP, one must take away the respiration of the organism, the producer from the GPP. These two are used to measure the way by which or the influence of primary producers on the Earth's living systems. This is otherwise known as primary production. Primary production means the study of organisms and how they provide supplements to another organism.
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