Annual Variation in the Yield of Needle Essential Oil of Abies sibiricafrom the Middle Taiga Subzone of Komi Republic
–The study on the content of Abies sibirica essential oil form the second-year needles found that annual dynamics of the essential oil components and total yield is adequately described by the statistical model ${{X}_{t}} = \mu + {{\varepsilon }_{t}},$$\quadt = 1, \ldots,n,$ where μ is a trend equal to a constant value, ${{{\varepsilon }}_{{\text{t}}}}$ is a random process having zero expectation and dispersion σε2. According to the obtained model, the yield of fir needle essential oil remained unchanged throughout the year – the average monthly yield is 6.6% a. d. w. The qualitative composition of essential oil varies irregularly throughout the year. The average monthly yield of the identified essential oil compounds is constant, and for prevailing compounds such as bornil acetate, camphene, α-pinene is 28.2; 29.0 and 11.0% respectively.  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