Periodic annual increment
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Definition
Periodic annual increment (growth), or PAI for short, is the change in the size of a tree between the beginning and ending of a growth period, divided by the number of years that was designated as the growing period (Avery, 339). The graph of PAI increases rapidly and then quickly declines after cresting.
References
Avery, Thomas E., Harold E. Burkhart. Forest Measurements, fifth edition. New York, New York: McGraw-Hill, 2002.
Chapman, Herman H., Forest Mensuration, second edition. New York: John Wiley & Sons, Inc., 1921.
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