AMPACT OF RENEWAL FILLING IN PINE STANDS ON GROUND VEGETATION
Silvicuetural effectiveness of renewal felling in many-herbal forest types of pine stands in sub zone of pre forest steppe of pine-birch forest has been analysed. At has been determined that when there is the second layer that consists of comman pine renewal felling can be carried our in one step, but under high density of parent stand in 2 or 3 steps. Renewal felling maxes possible to change the parenr forest ctand avoiding artificial reforestation. An many – herbal pine stands 63 plant species grow, they constitute ground vegetation, the number of species as concerns forest trials is varied from to 26 there. The maximum number of ground vegetation species was fixed on the forest trial where renewal felling with intensity 350, was carried unt 14 years ago, the relative density reducing up to 0,37. The above mentioned forest trial is characterized, as well by maximum epiterranean biomass of ground vegetation (1.7 t/ha in absolutely ary condition. At is worth of pointing out that species diversity and considerable amount of epiteranean biomass did not resuet in worseniug the condition for undergrowth of common pine accumulation. The number of viable undergrowth on the forest trial runs to 28983 p/ha in terms of large ones, that is quite enough to form highly productive pine stands. The minimum epiterranean biomass of ground vegetation (9467 kg/ha) has been fixed in 40-aged pine stands that has been formed 14 years later after final felling. The renewal felling of weak intensity results in species number of ground vegetation decreasing but it contributes to common pine undergrowth accumulation. Species of ground vegetation put down into Red Book has been fixed on 2 forest trials/ The later teshfies to ecological situation preservation under renewal felling carrying out and hence to its ecologieness. Species of grond vegetation distribuhon according to their price-types has shown that on absolutely large number of worked out plots forest species and on some of the grasslands species prevail. The share of some other price-typex groups are small that also teshifies to minimum impact of renwal felling on ecological situation.