Abstract
UDK: 630*232:582.475(497.6)
 It is well known that mechanical damage to trees, caused by felling and removal of timber from the forest, has multiple negative effects on the quality of the stock and the health of the forests as well as the volume increment. In Bosnia and Herzegovina there were no significant analises of volume increment loss due to bark damage of the trees. In this paper, a direct relationship between the significant damage to the bark of the stem and the size of the volume increment of individual trees was determined. Original data recorded during the Second National Forest Inventory in Bosnia and Herzegovina (2006-2009), within the accesible high economical forests was used. These forests cover a total area of 1.329.500 ha.
 Data on measured trees was taken from every fourth sample plot (one from cluster). 18.546 trees were selected, on which the 10-year increment of brest diameter (DBH) was measured and significant mechanical damage was recorded (LOJO et al., 2008). Of the total number of selected trees, 2.635 or 14.21% were mechanically damaged.
 The results of the study showed that the volume increment of trees, with significant bark damage of all tree species and thickness, was lower from 4,9% to 19,4% in average, compared to undamaged trees.
 Based on registered damage the bark of the stem, during second NFI BiH and determined the average losses increment on individual trees, it was estimated how much these losses are on an annual basis in, productive high forests in Bosnia and Herzegovina.
 The volume increment of mechanically damaged trees is statistically significantly lower compare to the increment of undamaged trees, resulting in a total loss of about 200.000 m3 / year / 1.329.500 ha.
Highlights
UvodEfforts to increase labor productivity, reduce unit costs, and facilitate extremely difficult and demanding forestry work have resulted in a significant mechanization of forest operations in the 1960s
Among the numerous authors dealing with forest damage, there is general agreement that, due to the nature of the work, forest operations cannot be carried out without some damage to the forest ecosystem, despite the protection measures implemented
The basic material for this work is the data on mechanical damage and DBH1 breast height diameter increment of trees, collected by inventory recordings during the implementation of the Second National Forest Inventory in BiH (NFI) from 2006 to 2009
Summary
The basic material for this work is the data on mechanical damage and DBH1 breast height diameter increment of trees, collected by inventory recordings during the implementation of the Second National Forest Inventory in BiH (NFI) from 2006 to 2009. For the needs of NFIs, a number of taxation elements, including mechanical damage of the trees, according to their location (stem or canopy) and the extent of damage, were recorded on every fourth sample plot (LOJO et al, 2008). Recorded tree data from sample plots within all “available high production character forests” were extracted from the formed database. Tabela 1: Zapreminskog prirasta krupnog drveta (po grupama vrstama drveća) visokih šuma proizvodnog karaktera u BiH prema drugoj NFI (2006.-2009.)
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