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Why is an ecosystem's net primary production (NPP) lower than its gross primary production (GPP)?
Wiki User
∙ 7y ago
Because of respiration. One part of the gross primary production is consumed for the total ecosystem respiration.
Wiki User
∙ 11y ago
Net primary production (NPP) is lower than gross primary production (GPP) because not all of the energy captured through photosynthesis is available for growth and reproduction. Some of the energy is used by plants for their own metabolic processes, such as respiration. Additionally, a portion of the energy is lost as heat during these metabolic processes. Therefore, NPP represents the amount of energy available for consumption by herbivores and higher trophic levels.
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