Predicting the growth response to thinning for Scots pine stands using individual-tree growth models

Abstract

Individual tree-growth models for diameter and height, and model of the cylindrical stem form factor are presented. The models were based on data obtained from 11 permanent thinning experiments located in even-aged Scots Pinus sylvestris stands in S and central Finland. Two alternative models were developed to predict tree diameter growth in thinned and unthinned stands. In the first model, the effect of stand density was described using stand basal area. In the alternative model, an explicit variable was incorporated referring to the relative growth response due to thinning. According to the results obtained, the information on the changes in the diameter/height ratio following thinning is sufficient to predict the change in stem form. -from Author