AP Environmental Science Quiz
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THE LIVING WORLD: ECOSYSTEMS
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A lake is fertilized with phosphorus to test nutrient limitation. After fertilization, algal GPP increases from 600600 to 1,000 g C m−2 yr−11{,}000\ \text{g C m}^{-2}\text{ yr}^{-1}, while algal respiration remains 400 g C m−2 yr−1400\ \text{g C m}^{-2}\text{ yr}^{-1}. What happens to NPP, and what does this suggest about the limiting factor before fertilization?
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