What does culmination of MAI indicate?

What does culmination of MAI indicate?

• A. The year when the current annual increment is highest.
• B. The age when CAI is zero.
• C. The age when PAI equals MAI.
• D. The age in the growth cycle at which MAI is at a maximum, indicating optimal harvest time.

Answer: (D)

Mean Annual Increment is the average amount of volume produced per year up to a given age, found by dividing the total volume by the age. The culmination of MAI is the age at which that average reaches its highest value. At this point the stand has accumulated enough volume that the average annual yield since planting is maximized. Harvesting at this age gives the best sustained mean annual yield for the rotation, which is why it’s considered the optimal harvest time. If you wait longer, growth continues but the extra years add less volume per year, causing MAI to decline; if you harvest earlier, the average annual yield remains lower because less volume has accumulated.

Mean Annual Increment is the average amount of volume produced per year up to a given age, found by dividing the total volume by the age. The culmination of MAI is the age at which that average reaches its highest value. At this point the stand has accumulated enough volume that the average annual yield since planting is maximized. Harvesting at this age gives the best sustained mean annual yield for the rotation, which is why it’s considered the optimal harvest time. If you wait longer, growth continues but the extra years add less volume per year, causing MAI to decline; if you harvest earlier, the average annual yield remains lower because less volume has accumulated.