The difference between gross primary production and both autotrophic and heterotrophic respiration. A full storage budget must additionally account for disturbance and lateral transfers.
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Net Ecosystem Production (NEP) is a key concept in ecology that refers to the balance between the amount of organic matter produced by photosynthetic organisms (like plants and phytoplankton) and the amount of organic matter consumed by respiration processes within an ecosystem. It is essentially a measure of the net carbon dioxide (CO2) uptake by an ecosystem.