Wpływ stosowanych technologii pozyskiwania drewna przez Zakłady Usług Leśnych na obecną i przyszłą jakość techniczną sosnowych drzewostanów przedrębnych

The aim of the paper is to determine the degree of damage of trees in a stand in the Kraft classes and diameters at breast height of trees in the damaged and undamaged stands depending on the harvesting system applied by Forest Services Companies. Field studies were carried out in the Polish lowlands in pine stands in the age classes II a, III a and IV a in the fresh forest habitat (Bśw) and mixed fresh forest habitat (BMśw). The prevailing species is pine (minimum 80%), and the assortment and tree−length methods are used for timber harvest. The thinning operations cause injuries to trees in the remaining stands and the scale of these injuries depends mainly on labour organisation.