Question

1. what is meant by gross primary productivity (gpp)?
2. what is the relationship between gpp and npp? include the equation from page 78.

Explanation:

1. Gross primary productivity (GPP) is the total amount of energy fixed by primary producers (like plants) through photosynthesis, converting carbon - dioxide and water into organic compounds and oxygen.
2. Net primary productivity (NPP) is the energy remaining after primary producers have used some of the energy from GPP for their own respiration. The relationship is given by the equation: $NPP = GPP - R$, where $R$ is the respiration rate of primary producers.

Answer:

1. Gross primary productivity (GPP) is the total energy fixed by primary producers via photosynthesis.
2. $NPP = GPP - R$, where NPP is net primary productivity, GPP is gross primary productivity, and R is the respiration rate of primary producers.