Tb. Lynch et Pa. Murphy, A COMPATIBLE HEIGHT PREDICTION AND PROJECTION SYSTEM FOR INDIVIDUAL TREES IN NATURAL, EVEN-AGED SHORTLEAF PINE STANDS, Forest science, 41(1), 1995, pp. 194-209
Methods for predicting the future total heights of shortleaf pine (Pin
us echinata) trees given current total height, age, site index, curren
t and future dbh are developed. The height projection equation is comp
atible with an equation that predicts total height given dbh, age, and
site index which can be used to estimate total heights if values of p
revious total height are not known. However, the system predicts futur
e total heights more precisely if previous values of total height are
known. Parameter estimates for the system of two equations were obtain
ed by applying seemingly unrelated nonlinear regressions to the system
of two equations, which had unequal sample sizes and restrictions on
equation parameters. The data were from remeasured plots located in na
tural, even-aged shortleaf pine stands, These equations can be used to
predict the heights of individual trees in an individual tree growth
and yield simulator or to predict the average heights associated with
dbh classes in diameter distribution growth and yield systems or stand
table projections.