Height Estimation in Stem Analysis Using Second Differences

Bethesda

1994

S. 329-340

11 Lit. Ang.

Bandaufführung

7380

64708

Issa, a new method for estimating heights at different ages from crosscut ring count, is discussed in this paper. Heights corresponding to the location of nodal diaphragms for 27 black pine trees were used as control values to test the precision of the Issa method in comparison with Lenhart's (1972) methods and with branch whorl method. The algorithms were applied at three different crosscut sampling frequencies (50-100-200cm). The precision of the methods was tested both in height growth and in annual height increment estimation and the predicted values were analyzed for each sampling frequency. The Issa method was the most precise at a frequency of 50cm, and the Carmean method was the most precise at a frequency of 200cm. Lenhart's algorithm produced the least satisfactory estimations independently of crosscut sampling frequency.