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Trees in an old-growth Douglas-fir forest in Oregon may use more than 90% of GPP in...

Trees in an old-growth Douglas-fir forest in Oregon may use more than 90% of GPP in respiration. What is the term for the remaining 10% of GPP that is not used in respiration, and what is it used for by the trees?

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The remaining 10% of GPP that is not used in respiration is called Net Primary Productivity (NPP). The NPP is used for the formation of organic material by tress, which then provides energy to heterotrophs as well

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