Author(s):
1. Dane Marčeta, Faculty of Forestry, University of Banja Luka, Republic of Srpska, Bosnia and Herzegovina
2. Vladimir Petković, Faculty of Forestry, University of Banja Luka, Republic of Srpska, Bosnia and Herzegovina
3. Ozren Žolja, Faculty of Forestry, University of Banja Luka, Republic of Srpska, Bosnia and Herzegovina

Abstract:
Damages which occur in the stand during felling and transport depend on harvesting system, density of forest roads, terrain condition and other factors. That is showed in a several studies (Doležal, 1984; Sabo, 2003; Košir, 2000). Residual stand damage includes damage to the stem (scarring or removal of bark), crown (breaking), and root (exposed). The extent of damage is highly related to the harvesting methods used. Ground skidding with skidder, used in primary transportation because of the low cost and high efficiency, is highly damaging residual stand and forest soil (Naghdi, 2005). Serious damages to the residual stand can affect the income of the forestry industry, forest owner and future crops. This type of damage can result in the death of the tree or volume losses due to decay (Han and Kellogg, 2000). In this study investigation was done in two compartments in the area of the FMU “Ribnik”. In each compartment 2 sample plots were selected, (A1, A2, B1 and B2). Sample plots were selected in the ways that have as much as possible similar stand and habitat conditions. On sample plots A1 and B1 the assortment harvesting method was performed, and on sample plots A2 and B2 half-tree harvesting method was performed. After cutting and skidding, damages were evidenced on all sample plots. Measuring was done on all damaged trees above 7 cm DBH. Total survey was done and several different parameters were measured. Results showed that total number of damages and the number of damages per tree was higher on the sample plots A1 and A2 than on the B1 and B2. The number of damaged trees per ha was similar regardless harvesting method. Within the same harvesting method the average damage surface was larger on sample plots with the half-tree length harvesting method, 50% were larger damages on sample plot A2 (half-tree length method) than A1(assortment method) and 21.7% on B2 (half-tree length method) than B1 (assortment method).

Key words:
skidding, ,damages,harvesting method

Thematic field:
Using of Forest Resources and Hunting

Date of abstract submission:
07.09.2017.

Conference:
Šumarska nauka u funkciji održivog razvoja šumarstva
25 godina šumarstva Republike Srpske