Estimating the Stand Structure Index Based on Lorenz Curve

                                                                       Woo-Kyun Lee

 

ABSTRACT : This study presents the method to quantify the stand structure diversity or homogeneity. Gadow's
dbh differentiation(Durchmesserdifferenzierung) is introduced which quantifies the horizontal stand
structure by the ratio of the dbh between subject tree and neighbour trees. And new stand structure
diversity index based on Lorenz curve, which is made by ratio of tree number and basal area or
volume by dbh class, is presented. The horizontal stand structure index based on Lorenz curve has a value from 0 to 1 as Gadow's index, and approximates to 1 if the stand strucure has high diversity. In the comparative analysis for
performance, the new stand structure index based on Lorenz curve is considered to compare with the Gadow's index for describing the stand structure.

 

Key words: stand structure diversity, dbh-dif!erentiation, Lorenz curve, stand structure index