Effect of soil disturbances by wood harvesting in late thinnings of pine stands on trees increment
Average annual increment of DBH, height and volume of pine trees was investigated ten years after thinnings causing soil disturbances, with division into five year periods (1–5 and 6–10). Following variants of soil disturbances were distinguished: furrows and tracks of hooves after horse extraction, ruts and furrows after skidder extraction, ruts and furrows after felling and delimbing with harvester and skidder extraction, ruts after extraction of logs and bolts with forwarder, ruts after producing logs and bolts with harvester and extraction with forwarder. Effect of soil disturbances on average increment of DBH, height and volume of trees turned out to be not statistically significant. However, in majority of analyzed cases the average annual volume increment of trees growing in a distance up to 5 m from strip road (zone with soil disturbances) was significantly lower than for trees growing in a distance over 15 m from this strip road (zone without soil disturbances).
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