Model zbieżystości strzał dla górskich drzewostanów świerkowych średnich klas wieku

The taper model presented in this paper was built for the mountain spruce stands in medium age classes. The model was described by multiple regression equations determining the thickness of a tree stem at different relative heights. Three variants of equations were proposed. In the simplest equation, d.b.h. and tree height were the explanatory variables while in the remaining equations height and thickness at half of the stem height were additional variables. The solution proposed in the paper allows for a precise estimation of the volume of stems and stem sections. At the same time it is free from systematic errors. The developed taper model can find practical application in determining tree shape, volume and timber assortment classes in forest inventories, standing tree quality assessment and stand pricing.