How is the NPP flux rate impacted by forest age? How does the carbon pool/stock get changed with forest age?
a. NPP flux rate increases with forest age, as older forests have more established and biologically diverse ecosystems that can support higher rates of photosynthesis and carbon uptake.

b. NPP flux rate decreases with forest age, as older forests may experience reduced productivity due to nutrient depletion, competition for resources, and natural disturbances.

c. The carbon pool/stock increases with forest age, as older forests accumulate more biomass and organic matter over time through plant growth and accumulation of dead organic material.

d. The carbon pool/stock decreases with forest age, as older forests may experience carbon loss through deforestation, disturbances, and natural decomposition processes that can reduce overall carbon storage.