What is the significance of the age at which MAI is maximized?

• A. It determines species type.
• B. It sets the first thinning schedule.
• C. It indicates the optimal point for harvesting to maximize yield.
• D. It defines maximum pest resistance.

Answer: (C)

Mean annual increment (MAI) is the average amount of wood produced per year up to a given age. The age where MAI reaches its peak marks the point where the stand delivers the highest average annual yield over the rotation. Harvesting at that age maximizes the mean annual production from one rotation; after that age, growth per year slows enough that spreading it over more years reduces the average annual yield. This interpretation doesn’t decide species type, thinning timing, or pest resistance—those involve other silvicultural and genetic factors. So the age of maximum MAI indicates the optimal time to harvest to maximize yield per year.