Acta Scientiarum Polonorum
Silvarum Colendarum Ratio et Industria Lignaria

Abstract The larch stem profile was analysed on the basis of 40 stems of Polish larch in the strictly protected J. Kostyrka reserve situated on the Chełmowa Mt in the Świętokrzyski National Park. An attempt was made to describe this profile in such a way that it would be possible to determine the volume of wood size classes on standing trees. For this reason the taper model worked out by Bi [2000] was used. On the basis of the material collected the taper model parameters were worked out. The model explains over 97.5% of the stem profile variation. The method of the stem form determination used is characterized by a high accuracy in determining the stem profile and stem volume. The formula worked out in this study, describing the stem form of Polish larch from the Chełmowa Mt, is of a local importance. Its practical application on a wider scale would require an estimation of for-mula parameters on the basis of a larger study material.