Regional stem curve and volume function model of Pinus densiflora in Kangwon-Province.

Joon Soon Kim², Woo Kyun Lee³, Woo Hyuk Byun³

 

Abstract : Volume functions, which arp usually expressed by the function of dbh and height. are estimated commonly
through the regression analysis with the highest statistical accuracy consid('red. In Korea, general volume
functions for each tree species were prepared by means of the regression analysis with the exponential function
(V=aD^bH^c<, having the dbh(D) and height(H) as independent variables. In this study, regional stern curve functions for tlw Pillus dcns!/lom in Kangwon -province were derived and a regional volurne function model, in which the stem vulunw can be directly estimated through the rotational integral of the regional stem curve functions, was prepared.
The regi(lnal volume estimated by the prepared model was more accurate than the volume by the general
volume table for the Pinus densiflora in Kangwon  province. Additionaly, the form of stern curves derived by
the regional stem curve functions showed difference trom each other. The stern in Youngwol and Wonju taper
clown more fast in upper part than that in other regions. These various stem forms also led to the regional
difference in volume estimates.

Key words : Volume estimate, volume function. regression analysis, stem curve function, volume function
model, rotational integral