The paper presents the changes of biomass in the young Scots pine (Pinus sylvestris L.) stand growing on dystrophic site type on the plots, where various methods of soil preparation and ways of utilizing logging residues were used. The research was carried out on an experimental plot located in the north−western part of Poland, in the Kalisz Pomorski Forest District. The soil preparation methods included: ploughing furrows with the LPZ−75 plough, ploughing furrows with active U−162 plough and ploughing up ridges using a plough−miller. On the other hand, logging residues management involved the following methods: complete removal, leaving residues on the clear−cut, as well as comminution of all residues. Methods of soil preparation and the ways of logging residues management significantly affected biomass of Scots pine regeneration. Among the methods of logging residues management, the most favourable effect was noted on the areas where logging residues were left. Mixing the litter with mineral soil promotes faster release of nutrients from the substrate. On the other hand, the lack of any soil preparation negatively affects the growth of Scots pine biomass. The optimal method of site preparation was the variant of leaving residues on the clear−cut, and then ploughing the furrows with the LPZ−75 plough.

Sylwan 165 (1): 21-29