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ŠUMARSKI LIST 1-2/2017 str. 11     <-- 11 -->        PDF

developed with stepwise method and step function, on the basis of the Akaike information criterion (AIC). All statistical analyses were carried out with RStudio software (2015).
There is no correlation between all the three variables of temperature sums (TEMP_NOV; TEMP_DEC; TEMP_JAN) and the beginning of budburst (rs=-0.003; rs=-0.056; rs=-0.086). The correlation relationships with precipitation are positive (PREC_NOV; PREC_DEC; PREC_JAN) and range between temperature and insolation in terms of their values (rs=0.049; rs=0.372; rs=0.247). The correlation coefficients for insolation variables (INS_NOV; INS_DEC; INS_JAN) are also positive and show the most significant values in all studied factors (temperature rs=0.712, insolation rs=0.652 and precipitation rs=0.652). Figure 1 shows mutual correlation relationships of all the studied variables.