Seasonal dynamics of monoterpene ratio in <i>Picea obovata (Pinaceae) </i>needles
The monoterpene composition in <i>Picea obovata </i>L. needles was studied during vegetation period by vapour-phase sampling of volatile compounds and the subsequent quantitative gas chromatography analysis. The quantitative gas chromatography analysis of the monoterpene hydrocarbons and terpenoides of <i>P. obovata </i>needles indicated the presence of strong correlations between their mass portions. Identified components were arranged in two groups of pairs: 1 - α-pinene-camphor, camphene-camphor, camphen-limonene, α-pinene-camphene, limonene-camphor and 2 - α-pinene-bornyl acetate, camphene-bornyl acetate, camphor-bornyl acetate, limonene-bornyl acetate. Monoterpene content has different dynamics in summer and depends on the daytime.