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What is the gross primary production of an ecosystem? How does GPP relate to photosynthesis?

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What is the gross primary production of an ecosystem? How does GPP relate to photosynthesis?

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Gross primary production of an ecosystem, or GPP, is the quantity of organic material found in a given area in a given period. Since only autotrophs produce organic material and photosynthesis is the main production process, GPP is a result of the photosynthesis. What are the factors that for influencing photosynthesis also interfere with the gross primary productivity? Mainly water and light, but also mineral salts, temperature, and carbon dioxide are factors that interfere with the gross primary productivity. What are the destinations of the organic material fabricated by the producers? Part of the organic material synthesized by the producers is consumed as energy source for the metabolism of the own producer individual. Other part is incorporated (into the body) and become available to heterotrophic beings of the ecosystem. In each following tropic level part of the organic material is used in the metabolism of the individuals of the level, other part is eliminated as waste and onl

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