# Primary Productivity Practice Problems.docx - Primary...

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Primary Productivity Practice Directions : On notebook paper, solve the following problems or answer the question. 1. The gross primary productivity (GPP) of an ecosystem is 3.5 kgC/m 2 /year, and the energy needed by the producers for their own respiration is 2.7 kgC/m 2 /year. What is the net primary productivity (NPP) of this ecosystem? a. Write a formula for finding NPP. b. Find the NPP of this ecosystem (include units). 2. The net primary productivity of a particular wetland ecosystem is found to be 2,000 kcal/m 2 /year. If respiration by aquatic producers is 18,000 kcal/m 2 per year, what is the gross annual primary productivity for this ecosystem, in kcal/m 2 per year? (Show your work) 3. Energy flow in Lake Fremont (kcal/m 2 /year): In the community described in the table above, which of the following represents the respiratory energy (kcal/m 2 /year) used by producers? a) 10 b) 200 c) 1,600 d) 2,000 e) 10,000
• Fall '19
• Photosynthesis, trophic level, NPP, primary production, actual energy transfer efficiency

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