Author(s):
1. Jelena Subotić, Republic of Srpska, Bosnia and Herzegovina
2. Vojislav Dukić, Šumarski fakultet Banja Luka , Republic of Srpska, Bosnia and Herzegovina
3. Goran Trbić, Republic of Srpska, Bosnia and Herzegovina
4. Zoran Maunaga, Šumarski fakultet Banja Luka , Republic of Srpska, Bosnia and Herzegovina

Abstract:
This study on silver fir were aimed at investigating the relationship between annual ring growth rhythms and climate factors in the Kozara national park. In spring 2015 we selected four sampling plots in a mixed forest of European beech and silver fir (Festuco drymeiae-Abietetum). On each plot we sampled 15 dominant and healthy trees from the upper canopy layer. Two increment core per tree was taken with Pressler borer from the breast height. CooRecorder image analysing program was used for ring width measurements. Using the methodology of dendroclimatology, tree-rings are compared to climate data to investigate their variability and mutual connection. Statistical check of cross-dating and measurements is done in COFECHA program. Chronology by localities and mean reference chronology for Kozara national park developed in ARSTAN program. Tree-ring width series covering the period of 1927-2014 (88 years) were correlated with mean monthly temperature and precipitation (Weather station Prijedor, for the period 1961-2014). Mean sensitivity within the entire data set equals 0.232. By the correlation analysis between the tree-ring widths and monthly mean temperature the highest negative value of the correlation coefficient was determined for September of the previous year (r = -0.43) and the highest positive value (r = 0.35) for April of the current year. Correlation analysis between the tree-ring widths and monthly precipitation amounts the highest negative value was determined for October of the current year (r = -0.20) and the highest positive value (r = 0.38) for July of the current year. The highest value of the coefficient of multiple partial correlation for temperature was determined for September of the previous year (-0.39) and for precipitation for May of the current year (0.44). Based on the data (for the period 2007-2014) with the Weather station Mrakovica (in the immediate vicinity of the sampling plots), a significant ratio of tree-ring widths and aridity index (FAI) was established. The determined value of the correlation coefficient is - 0.74.

Key words:
Abies alba, dendroclimatology, temperature, precipitation, aridity index, Kozara

Thematic field:
Forest Menagement Planning

Date of abstract submission:
05.09.2017.

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