Udział bielu i twardzieli w strzałach sosen zwyczajnych (Pinus sylvestris L.)

In this paper the attempt has been made to determine the proportion of sapwood and heartwood in pruned and non−pruned stems of Scots pine growing in the fresh mixed coniferous forest. Research results have shown that the proportion of heartwood in pruned pine stems was higher than in non−pruned ones. This was particularly noticeable after 24 years from the treatment while after 51 years this regularity was less distinct.