XVI International Botanical Congess
Seedlings density was analyzed in pine forests of lichen site type burned 5-210 years ago. Extreme versions of after-fire damage of stands were analyzed: sample I - fire-killed trees amount to less than 30%, sample II - fire-killed trees amount to more than 70%. In forests, belonged to sample I, maximal regrowth density (~15 ind. m2) was 30-40 years after fire. Only 0.005-0.5% of individuals, grown during the first 30-40 post-fire years, therewith, will be involved in the tree stratum in forests ~150 years after fire. In sample II forests maximal regrowth density was 5 times lower (2-3 ind. m2) than in sample I and was found 60 years after fire. In this case, 10-20% of individuals, grown during the first 30-40 post-fire years will be involved in tree stratus 150 years after fire. That means, that the extraordinary high values of regrowth density, found in sample I forests 30-40 years after fire, was a reaction of a community to the external affect, unnecessary to the tree stratus regeneration.