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The paper presents analysis of tree damage after early thinning in lowland spruce stands. Percentage of tree with damage and weighted damage index (WDI) were considered. Three different thinning operations were analysed, in which different cutting method was applied. The smallest level of damage was observed when short wood system (SWS) was used. There were no significant differences between frequency of damage when full tree (FTS) and long wood (LWS) systems were compared.
The paper studies tree damage after late thinning operation in lowland spruce stands. The research was done in the 4th age class stands, where three different methods of timber harvesting were applied: full tree system (FTS), long wood system (LWS), short wood system (SWS). The lowest level of damage was observed in SWS.
The classification of round wood depends on the defects and other morphological features of a tree trunk. Various tree species growing on different forest sites and in different conditions eventually present a wood quality influenced by said factors. The objective of this paper was to find out: 1) the distribution of round wood quality classes of beech in three different site conditions and 2) the frequency of the defects influencing timber grading. The research was carried out on 15 different sample plots of three site quality classes, on which 1389 beech logs were classified according to the existing grading scheme. The most common timber quality (by volume) was WC0 and then in decreasing order: WD, WB0 and WA0, in proportions of: 15:10:4:1. This order was the same for the assortments obtained from the trees in all the analysed site quality classes. The most frequent defects influencing wood quality were knots, among which sound knots were in the majority. The proportion of the appearance of knots was 7:3:2 for sound knots, unsound and dead knots, as well as covered knots, respectively. Sweep, red heart and scars were of a similar frequency to sound knots, approx. 20%. Double pith, shakes, rot, top diameter and spiral grain were of a minor influence on WQCs and together amounted to approx. 10% of the frequency among other defects.
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