Experiments on different intensity thinning of pine stands

The first stage research results on the application of modern thinning technology on the sample plots of the study-lab facility of Petrozavodsk State University are presented. A series of permanent sample plots with pine stands was established. A set of forest mensuration works was carried out. Thinning of varying intensity was implemented using different technologies. Subsequent assessment on the quality of thinning was conducted. The stock removal rate ranged from 23 % to 39 % potentially providing a possibility to estimate the effect of moderate and heavy removal on the stands' growth and resistance. The number of trees damaged during thinning ranged within 3 %, which is considered an acceptable amount for late thinning in managed forests. The sample plots can be used for educational purposes due to their convenient location and close proximity to the city.