Increments in trees injured during late thinning in pine stands
The analysis covered average annual dbh, tree height and volume increments within ten years after the occurrence of injury (broken down into five-year periods of 1–6 and 6–10 years) during late thinning in pine stands. The injury of sample trees was classified as small – up to 100 cm2, and large – above 100 cm2. In both cases, two injury degrees were distinguished: without injury to wood tissue and with injury to wood tissue. The inventory carried out immediately after the thinning was the basis for determining the area and depth of wound. Trees free from mechanical injury were referred to for comparison. Tree volume was determined by sectioning felled trees. In all analyzed comparisons, the annual increment of dbh and volume of injured trees, within ten years after injury, was higher than in the case of uninjured trees, and for part of the studied comparisons the differences were statistically significant. In none of the analyzed comparisons found were significant differences in annual height growth. There were neither distinct regularities as concerns increment arrangement dependent on the area and depth of tree wound.
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